Metallography Part I - Macroscopic Techniques
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- Опубліковано 27 чер 2024
- Metallography Part I -- Macroscopic Techniques
- Preparation of an ingot and a piston: sawing, grinding and etching
- Individual grains are visible
- Preparation of several steel specimens: flame hardened tooth of a gear wheel, induction hardened cylindrical shaft, induction hardened splined shaft, case hardened tooth of a gear wheel, weld joint
- Weld pass structure and heat treated zones and are visible
Responsible for this video: Prof. Dr.-Ing. Rainer Schwab, Hochschule Karlsruhe (Karlsruhe University of Applied Sciences), Germany - Наука та технологія
Very informative and clear explanation. And thanks for all the samples shown!
Very profesional production. Well done! Thanks.
Nice, to see this kind of knowledge
Very much helpful for the students to understand about the macroscopic examination of Engineering Materials. Thank you.
I appreciate sharing this video.
Nice and very helpful video! Thanks
thank you, this is awesome. perfect. So please keep going to explain us about materials science process.
I love it this video . Practical is more important for gain of knowledge.
Amazing VDO, verything is clear, good explanation
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 !
thank you sir for beautifully explained ....please upload more videos....🙏🙏
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.
Nice video！！！What is the etching solution you were using in the video? Thanks!
Thank you 👍
Excellent explaination
Wow!! So much info..
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.
Hello, is there any books that are related to metallography and microstructure analysis? great video btw, ty
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
Buen video - Realize miles de pruebas a juntas de soldaduras
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
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
Thanks!
What is the macro etchant used
Peace & love 💕
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!
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.
Thanks sir
Excellent video. Thanks, But glove up when using chemicals.
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 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 ...
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.
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.
I would like a report on this experience in Word format
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.
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
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.
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.
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.
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.
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.
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 ...
No comments yet?
a few COSHH requirements missing here. good video though
pinchis cuartillas para la escuela
Explaning in tamil pl..
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Answer to "Application for Copyright Permission For Educational Use": The videos are available under the standard UA-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!
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.