Excellent video ! ! ! Good online learning resource The safety aspect was left out though, fumes from HNO3 and HF are toxic , etching should always be done with Chemical splash goggles and the right respirator.I remember this from MSDS back at work.
The concentrations used are typically very low (2-3%, 5 max) and usually not fuming. If used only for very short time period and otherwise sealed a fumehood/respirator is not required
Answer to "It's sad that you don't make videos anymore. Educating others to carry the torch, is the ultimate sacrifice.": Thank you, I agree, but we are quite simply booked out by other work.
Isn't the inside of steel food cans lined with a plastic or epoxy layer to prevent acidic food from etching the steel? If so, how did the inside of that can get etched?
Answer to "Isn't the inside of steel food cans lined with a plastic or epoxy layer to prevent acidic food from etching the steel? If so, how did the inside of that can get etched?": Most cans have an additional polymer coating, some do not. Both methods have their advantages and disadvantages, an interesting topic. The can under study did not have a coating.
Answer to "are we also taking in some metal in the fruit liquid if the tin has been stored for a long time??" Yes! Some of the tin has dissolved and is now in the canned fruit. This has been studied extensively, and researchers have determined that it is safe for health. The amount of tin is very small. The alternative is an additional polymer coating, which is often used. But even then, small amounts of the polymer coating go into the fruit.
Answer to "That weld at 7:43 is really interesting. I'm gonna go out on a limb and guess that it was a MIG weld, because the center of the joint wasn't filled.": The weld was made by classical shielded metal arc welding. It is actually not a good type of weld design, only suitable for predominantly static loads, but interesting to examine metallographically.
Thank you for the response! I would have never guessed it was SMAW. So, this looks like a piece of 1/2" plate with a bevel that goes down 2/3 the way, then a pass on the back. Was this done with different welding rods? I can see a grain structure difference in the weld, as if it were done in multiple passes, then covered with a weld filler of different composition.
Answer to "Thank you for the response! I would have never guessed it was SMAW. So, this looks like a piece of 1/2" plate with a bevel that goes down 2/3 the way, then a pass on the back. Was this done with different welding rods? I can see a grain structure difference in the weld, as if it were done in multiple passes, then covered with a weld filler of different composition.": All welding passes were probably (I do not know for certain) done with the same welding rods. Interestingly in multipass welding (upper part of the weld) the individual passes are difficult to distinguish. This is due to the heat affected zones of the individual passes, which change the rather coarse grained primary structure of the passes lying underneath to a much finer grained equiaxed structure. Only in the last weld passes (quite on the top and the single one at the back) the primary crystal structure is visible.
Thank you for the detailed steps involved in the microstructure analysis. I am trying to get the microstructure of AZ91 magnesium alloy with following steps but not getting the exact grains and phase identification. Will you please advise or correct me? Steps tried: [ 1]. Specimen Size: 20x20x6.35 mm; [2]. Bakelite mounting. [3] Grinding with 180 SiC grit followed by 200, 400, 800 and 1200 grits with 90 degree rotation for each paper. [4] Polishing with 6, 3 and 1 micrometer diamond slurry. [5] water washed and applied the picric acid etchant for magnesium alloys as per ASTM 407. Also, I tried with oxalic acid to reveal the grains but unable to get it I request you to please suggest any corrected solution as i got stuck for my PhD work due to this. Thank you in advance
Answer to " I am trying to get the microstructure of AZ91 magnesium alloy with following steps but not getting the exact grains and phase identification.": Unfortunately, we have little experience with magnesium alloys. There are some good books on the market that explain the whole process, for example the German book "Petzow: Metallographisches, Keramographisches, Plastographisches Ätzen". Some companies also offer information on the Internet, for example Buehler.
Hi,thx for the video,we are a die casting company,we want to change our micro structure to increase our tensile strength from 300 to say 400,can u tell us what we have to add to A356 aluminium to get increased tensile strength
I have an image of tool steel specimen after forging operation. And I want to check the presence of non metallic inclusion in it. Is there any free software solution available for image analysis of precipitation?
Anyone been sucessfull with etching Aluminium alloy like 6061 with NaOH solution, like the one suggested by Georges Vander Voort? I have yet to try 10-20g of NaOH with 100mL warm water.
wow those videos are really awesome! a big thanks for them!, I am looking to macro etch a piece of leaf spring (SAE 6150) in order to reveal forging grain flow, what etchant would you recommand? I have picric acid, nitric, chlohorhydric also. Thanks!
Answer to "wow those videos are really awesome! a big thanks for them!, I am looking to macro etch a piece of leaf spring (SAE 6150) in order to reveal forging grain flow, what etchant would you recommand? I have picric acid, nitric, chlohorhydric also. Thanks!": Thank you for the praise! AISI/SAE 6150 steel (51CrV4) is a low alloy steel and as such may be etched with nitric acid diluted in alcohol (Nital). For macro etchings 10% acid in alcohol is probably best, for micro etchings 2 or 5%, but just try it. There are several alternatives (sorry, I have no experience with them), depending on what you want to see in detail. In many cases, you just have to try them out.
Answer to "Impressive videos and very knowledgeable. Will this channel upload more videos? I'm really looking forward to seeing them.": Thank you for your kind reply. I am working on new videos in materials science, but they will probably take some time to finish. Antworten 0 Antworten
Answer to "excellent work. but where is the safety things during polishing of the sample???" Polishing (and grinding) typically is not a problem. Etching (as indicated) may be dangerous, and one has to be careful.
Answer to "what kind of etchant should we use ...and is there a special kind of etachant of each type of metals ...many thanks for your effort in advance": Different materials have different properties, so each material needs its specific etchant. In some cases, one etchant is suitable for several materials. You find many informations on this topic in the internet and in classical literature.
That video shows a lot and explains when some samples might be used to judge if part is OK or NOK. It might be a part of introduction to metallography in all technical universities.
Answer to "What is the preposition of chemicals." There are many different chemicals in use. In the case of the aluminium alloys we used a mixture of different mineral acids, in the case of unalloyed and low alloy steels it was 10 % HNO3 in alcohol. There are some books on the market (or available in libraries) which show the exact composition and most of all the exact safety instructions.
Answer to "How to check in inclusion in microscope method…": Inclusions can only be seen on the prepared surface of the sample, when they lie within the surface plane. Obviously inclusions above or below the prepared surface cannot be seen.
@@MaterialsScience2000 Dear sir,i have making the hot mold and prepared surface of the sample within the surface plane.after prepared mold kept on plain surface in microscope.100x magnification check in inclusion but not cleared thick & thin. how to analysis inclusion sir...??
Answer to "Dear sir,i have making the hot mold and prepared surface of the sample within the surface plane.after prepared mold kept on plain surface in microscope.100x magnification check in inclusion but not cleared thick & thin. how to analysis inclusion sir...??": In which way have you prepared your specimen? Sorry, I do not understand it.
Your videos are great.I've shared this on facebook.Can you please upload videos on heat treatment, autocllimator,angle dekkor or suggest me similar links?
We are working on more videos, but it a hell of a lot of work. Some of our next videos still concern testing of materials. May be "classical" materials science videos will be coming later. Really good alternatives are rare, I am afraid.
A salah eddine Sorry, we do not have an English Version. There is a German book available: "Werkstoffkunde und Werkstoffprüfung für Dummies", if that helps ...
Application for Copyright Permission For Educational Use November 28, 2018 The Southern Regional Education Board (SREB) and the state of Ohio are partnering in the development of an Automated Materials Joining Technology (AMJT) curriculum for high school students. The curriculum is part of SREB’s Advanced Career (AC) project that involves 9 states in the development of project-based curriculum with each state authoring its own unique career area. We are writing to request copyright permission for teachers and students to view the following link for completing Project 2 in Course 3 (Advanced Concepts in Materials Joining): th-cam.com/video/fc8zrgYJCJw/w-d-xo.html Also, no changes in or deletion of author attribution, trademark, legend, or copyright notice will be made, if permission is granted. We hope you will be able to respond positively to our request. We will cite appropriately. Thanks. Jim Berto James J. Berto AC Program Manager/Research Associate, School Improvement Southern Regional Education Board 592 Tenth Street, N. W. Atlanta, GA 30318-5776 Phone 404-875-9211, ext. 228 Direct 404-879-5528 Fax 404-872-1477 james.berto@sreb.org www.sreb.org
Answer to "Application for Copyright Permission For Educational Use": The videos are available under the standard TH-cam license. So I am afraid, that downloading the videos is not allowed. However, you can always set a link to the videos. Good luck with your courses!
Answer to "a waste of water, girl!" This is more than ever an important point. Actually, we turn off the tap immediately after etching, but were distracted by the video recording.
大学の課題にこの動画を見させていただきました！すごく質の高い動画をありがとうございます！from JP !
Very informative and clear explanation. And thanks for all the samples shown!
Very much helpful for the students to understand about the macroscopic examination of Engineering Materials. Thank you.
Nice, to see this kind of knowledge
Amazing VDO, verything is clear, good explanation
Very profesional production. Well done! Thanks.
thank you, this is awesome. perfect. So please keep going to explain us about materials science process.
Excellent video ! ! ! Good online learning resource
The safety aspect was left out though, fumes from HNO3 and HF are toxic , etching should always be done with Chemical splash goggles and the right respirator.I remember this from MSDS back at work.
Thanks, you are right!
The concentrations used are typically very low (2-3%, 5 max) and usually not fuming. If used only for very short time period and otherwise sealed a fumehood/respirator is not required
Excellent videos. Thanks for posting this.
PS: Is there a Metallography Part II?
Metallograpy Part II is almost finished, may be coming in a few months, but we are busy with many projects at the moment.
thank you sir for beautifully explained ....please upload more videos....🙏🙏
I love it this video . Practical is more important for gain of knowledge.
It's sad that you don't make videos anymore.
Educating others to carry the torch, is the ultimate sacrifice.
Answer to "It's sad that you don't make videos anymore. Educating others to carry the torch, is the ultimate sacrifice.": Thank you, I agree, but we are quite simply booked out by other work.
Nice and very helpful video! Thanks
Isn't the inside of steel food cans lined with a plastic or epoxy layer to prevent acidic food from etching the steel? If so, how did the inside of that can get etched?
Answer to "Isn't the inside of steel food cans lined with a plastic or epoxy layer to prevent acidic food from etching the steel? If so, how did the inside of that can get etched?": Most cans have an additional polymer coating, some do not. Both methods have their advantages and disadvantages, an interesting topic. The can under study did not have a coating.
I would like a report on this experience in Word format
Excellent explaination
are we also taking in some metal in the fruit liquid if the tin has been stored for a long time??
Answer to "are we also taking in some metal in the fruit liquid if the tin has been stored for a long time??" Yes! Some of the tin has dissolved and is now in the canned fruit. This has been studied extensively, and researchers have determined that it is safe for health. The amount of tin is very small. The alternative is an additional polymer coating, which is often used. But even then, small amounts of the polymer coating go into the fruit.
I appreciate sharing this video.
Can you alos make diiff types of microstructure need yo be examined....like Grain flow,forged structure of steel,defects and many morw
That weld at 7:43 is really interesting. I'm gonna go out on a limb and guess that it was a MIG weld, because the center of the joint wasn't filled.
Answer to "That weld at 7:43 is really interesting. I'm gonna go out on a limb and guess that it was a MIG weld, because the center of the joint wasn't filled.": The weld was made by classical shielded metal arc welding. It is actually not a good type of weld design, only suitable for predominantly static loads, but interesting to examine metallographically.
Thank you for the response! I would have never guessed it was SMAW. So, this looks like a piece of 1/2" plate with a bevel that goes down 2/3 the way, then a pass on the back. Was this done with different welding rods? I can see a grain structure difference in the weld, as if it were done in multiple passes, then covered with a weld filler of different composition.
Answer to "Thank you for the response! I would have never guessed it was SMAW. So, this looks like a piece of 1/2" plate with a bevel that goes down 2/3 the way, then a pass on the back. Was this done with different welding rods? I can see a grain structure difference in the weld, as if it were done in multiple passes, then covered with a weld filler of different composition.": All welding passes were probably (I do not know for certain) done with the same welding rods. Interestingly in multipass welding (upper part of the weld) the individual passes are difficult to distinguish. This is due to the heat affected zones of the individual passes, which change the rather coarse grained primary structure of the passes lying underneath to a much finer grained equiaxed structure. Only in the last weld passes (quite on the top and the single one at the back) the primary crystal structure is visible.
Thank you for the detailed steps involved in the microstructure analysis. I am trying to get the microstructure of AZ91 magnesium alloy with following steps but not getting the exact grains and phase identification. Will you please advise or correct me?
Steps tried: [
1]. Specimen Size: 20x20x6.35 mm;
[2]. Bakelite mounting.
[3] Grinding with 180 SiC grit followed by 200, 400, 800 and 1200 grits with 90 degree rotation for each paper.
[4] Polishing with 6, 3 and 1 micrometer diamond slurry.
[5] water washed and applied the picric acid etchant for magnesium alloys as per ASTM 407. Also, I tried with oxalic acid to reveal the grains but unable to get it
I request you to please suggest any corrected solution as i got stuck for my PhD work due to this. Thank you in advance
Answer to " I am trying to get the microstructure of AZ91 magnesium alloy with following steps but not getting the exact grains and phase identification.": Unfortunately, we have little experience with magnesium alloys. There are some good books on the market that explain the whole process, for example the German book "Petzow: Metallographisches, Keramographisches, Plastographisches Ätzen". Some companies also offer information on the Internet, for example Buehler.
Hi,thx for the video,we are a die casting company,we want to change our micro structure to increase our tensile strength from 300 to say 400,can u tell us what we have to add to A356 aluminium to get increased tensile strength
After 10 years TH-cam recommended this video
Wow!! So much info..
I have an image of tool steel specimen after forging operation. And I want to check the presence of non metallic inclusion in it.
Is there any free software solution available for image analysis of precipitation?
Answer to "Is there any free software solution available for image analysis of precipitation?": I have not found any free software myself, sorry ...
Nice video！！！What is the etching solution you were using in the video? Thanks!
Anyone been sucessfull with etching Aluminium alloy like 6061 with NaOH solution, like the one suggested by Georges Vander Voort? I have yet to try 10-20g of NaOH with 100mL warm water.
wow those videos are really awesome! a big thanks for them!, I am looking to macro etch a piece of leaf spring (SAE 6150) in order to reveal forging grain flow, what etchant would you recommand? I have picric acid, nitric, chlohorhydric also. Thanks!
Answer to "wow those videos are really awesome! a big thanks for them!, I am looking to macro etch a piece of leaf spring (SAE 6150) in order to reveal forging grain flow, what etchant would you recommand? I have picric acid, nitric, chlohorhydric also. Thanks!": Thank you for the praise! AISI/SAE 6150 steel (51CrV4) is a low alloy steel and as such may be etched with nitric acid diluted in alcohol (Nital). For macro etchings 10% acid in alcohol is probably best, for micro etchings 2 or 5%, but just try it. There are several alternatives (sorry, I have no experience with them), depending on what you want to see in detail. In many cases, you just have to try them out.
@@MaterialsScience2000 thanks, I will try with 10% nital!
Impressive videos and very knowledgeable. Will this channel upload more videos? I'm really looking forward to seeing them.
Answer to "Impressive videos and very knowledgeable. Will this channel upload more videos? I'm really looking forward to seeing them.": Thank you for your kind reply. I am working on new videos in materials science, but they will probably take some time to finish.
Antworten
0 Antworten
What is the macro etchant used
excellent work. but where is the safety things during polishing of the sample???
Answer to "excellent work. but where is the safety things during polishing of the sample???" Polishing (and grinding) typically is not a problem. Etching (as indicated) may be dangerous, and one has to be careful.
what kind of etchant should we use ...and is there a special kind of etachant of each type of metals ...many thanks for your effort in advance
Answer to "what kind of etchant should we use ...and is there a special kind of etachant of each type of metals ...many thanks for your effort in advance": Different materials have different properties, so each material needs its specific etchant. In some cases, one etchant is suitable for several materials. You find many informations on this topic in the internet and in classical literature.
That video shows a lot and explains when some samples might be used to judge if part is OK or NOK. It might be a part of introduction to metallography in all technical universities.
Thank you 👍
Buen video - Realize miles de pruebas a juntas de soldaduras
Hello, is there any books that are related to metallography and microstructure analysis? great video btw, ty
Can you write which macro etchant you are using for aluminum alloys
I can tell your nitric and ethanol is called nital etch. I use a lot of etchants at work
Excellent video. Thanks, But glove up when using chemicals.
What is the preposition of chemicals.
Answer to "What is the preposition of chemicals." There are many different chemicals in use. In the case of the aluminium alloys we used a mixture of different mineral acids, in the case of unalloyed and low alloy steels it was 10 % HNO3 in alcohol. There are some books on the market (or available in libraries) which show the exact composition and most of all the exact safety instructions.
Dear sir,
How to check in inclusion in microscope method...
Plz reply sir...
Answer to "How to check in inclusion in microscope method…": Inclusions can only be seen on the prepared surface of the sample, when they lie within the surface plane. Obviously inclusions above or below the prepared surface cannot be seen.
@@MaterialsScience2000 Dear sir,i have making the hot mold and prepared surface of the sample within the surface plane.after prepared mold kept on plain surface in microscope.100x magnification check in inclusion but not cleared thick & thin. how to analysis inclusion sir...??
Answer to "Dear sir,i have making the hot mold and prepared surface of the sample within the surface plane.after prepared mold kept on plain surface in microscope.100x magnification check in inclusion but not cleared thick & thin. how to analysis inclusion sir...??": In which way have you prepared your specimen? Sorry, I do not understand it.
Your videos are great.I've shared this on facebook.Can you please upload videos on
heat treatment, autocllimator,angle dekkor or suggest me similar links?
We are working on more videos, but it a hell of a lot of work. Some of our next videos still concern testing of materials. May be "classical" materials science videos will be coming later. Really good alternatives are rare, I am afraid.
Peace & love 💕
Thanks!
Thanks sir
Yes it was an excellent video, but if can give us document paper please
A salah eddine Sorry, we do not have an English Version. There is a German book available: "Werkstoffkunde und Werkstoffprüfung für Dummies", if that helps ...
a few COSHH requirements missing here. good video though
No comments yet?
Application for Copyright Permission For Educational Use
November
28, 2018
The Southern Regional Education Board (SREB) and the state of Ohio are partnering
in the development of an Automated Materials
Joining Technology (AMJT) curriculum for high school students. The curriculum
is part of SREB’s Advanced Career (AC) project that involves 9 states in the
development of project-based curriculum with each state authoring its own unique
career area.
We
are writing to request copyright permission for teachers and students to view
the following link for completing Project 2 in Course 3 (Advanced Concepts in
Materials Joining):
th-cam.com/video/fc8zrgYJCJw/w-d-xo.html
Also,
no changes in or deletion of author attribution, trademark, legend, or
copyright notice will be made, if permission is granted.
We hope you will be able to respond positively to
our request.
We
will cite appropriately.
Thanks.
Jim
Berto
James J. Berto
AC Program Manager/Research Associate, School Improvement
Southern Regional Education Board
592 Tenth Street, N. W.
Atlanta, GA 30318-5776
Phone 404-875-9211, ext. 228
Direct 404-879-5528
Fax 404-872-1477
james.berto@sreb.org
www.sreb.org
Answer to "Application for Copyright Permission For Educational Use": The videos are available under the standard TH-cam license. So I am afraid, that downloading the videos is not allowed. However, you can always set a link to the videos. Good luck with your courses!
اللي من طرف العيدروس لايك
نكبنا الله يصلحه متورط فيه هههههههههههههههههههههههههههههههههههههههههههههه
Explaning in tamil pl..
pinchis cuartillas para la escuela
Well, learn how to grind and edge metal.
a waste of water, girl!
Answer to "a waste of water, girl!" This is more than ever an important point. Actually, we turn off the tap immediately after etching, but were distracted by the video recording.