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Discussions on metallurgy. Links to the popular press, scholarly works, personal blogs/websites, and general discussion are welcome and encouraged!

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Physical Sciences



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Induction hardening and health

Hello guys, i have question about how induction hardening will affect health? They just put me in work on induction hardening machine and i wonder how harmful is it? There is big generator and the metal is heated to 900 celsius and instantly cooled, so what are long term effects on health?

07:32 UTC


Can anyone help identify what grade of steel this is?

I brought a piece of steel to our lab to analyze it and this was the results. I’ve never seen a NiCrMo steel with added copper to it. It was off of a ww2 gun receiver if that’s any help to anyone

01:17 UTC



is there a metal or metal alloy that is durable like iron and has a melting point of around 600-1000°C

14:04 UTC


Does heating increases gold malleability ? Or it only makes it soft when you work hardened it

Does heat increases malleability in general also ? Or it only works when you have deformed it or work hardened it

06:27 UTC


Data cable melt

I melted some communication cable (cat6), what I got was an almost rose gold ingot that came out cleaner than most of my bare bright melts. Anyone know if communication cables are made of something other than just copper?

22:44 UTC


Refining Process for 99.9% purity?

Any tips on getting the highest quality ingots? My copper always comes out nasty because I don't clean it first. I feel like it's so inefficient cleaning wbery pipe or condensor and sometimes if its from a motor those small wires would take forever. I'm also not specifically asking about copper. I assume the solution would apply to all metals?

I've seen some people strain the Slag the best they can out of a crucible and then they just slowly pour the metal out into a bucket of water. Since the clean metal is lighter and more viscus than the reamining slag, it ends up staying in the bottom of the crucible while the slag remains and you only end up getting the pure stuff.

Any non chemical or electrolysis tips for doing this? I have tons of copper aluminum and brass I'd like to brick up. Thanks in advance!

22:10 UTC


Fracture in Metallic Glasses

How well understood are the fracture mechanisms in metallic glasses? They seem like fascinating materials, are any of you active researchers in the field?

1 Comment
17:39 UTC


What to look out for Met Lab equipment?

I'm just an admin assistant, and have no scientific background. I've been put into the deep end and been asked to help source equipment quotations for a lab with a pretty modest budget, and present the options to my boss and his team for consideration.

Specifically I need to look for:

  • Floor Standing Sectioners/Cut Off Tool
  • Benchtop Sectioners/Cut Off Tool
  • Grinders
  • Polishers
  • Mounting Equipment
  • Microscopes
  • Hardness Testers

I have been given the contact for the distributor for Allied High Tech and asked for a rough pricing schedule, but I can't just throw their catalogue and call it a day.

I've also identified via Google that other manufacturers that can provide the above include Struers, Buehler, QATM for the cutting and grinding tools, and Keyence VHX-6000/7000 for the Microscope.

So I would like to ask you industry veterans if you could assist in helping me identify exactly what qualities I should be looking for in each category so that my search can go better.

Probably some of your own anecdotal pros and cons based on your experience with your equipment would also help. Especially if you guys have worked with any Allied equipment and can tell me whether they perform up to snuff / value for money.

07:37 UTC


What type of metal is this? It's shiny and grayish in color. I found it in Brampton, Canada.

02:58 UTC


Early Iron-Carbon Phase Diagram

I'm looking for a very early version. I used to have a scan of a beautiful hand-written diagram from the early 1900s or maybe even earlier but I lost it. I believe it may have even been before the Roberts-Austen diagram.

If anyone has any leads I'd appreciate the help!

07:20 UTC


can somebody please help me with these metallurgy questions? I have no clue what it's asking.

read the chapter and still don't understand it. what are the cooling pathways and how do I read/understand the chart?

07:46 UTC


Does a gold steel alloy exist

What would happen if you added molten steel into a crucible of molten gold? Would it make a good alloy? Could it be used for anything?

18:05 UTC


Why should de-embrittlement baking should be applied in a short time? What happens if delayed?

I'm talking about 10.9 grade fasteners that have been zinc galvanized. They should be treated for hydrogen embrittlement. As far as I know, this should be done quickly, not more than 1-2 hours after coating. But why? What happens inside the metal if it waits for longer?

08:24 UTC


Do typical keyrings loosen up over time when pulled apart again and again?

Hi reddit,

you guys all know a typical keyring that makes it easy to add a couple of keys and hold them together. In case I add two smaller rings and pull them to the opposite sides (see blue arrows in the image attached), the keyring obviously gets pulled apart and it gets bigger (red distance D between the two endings in my image increases). When the pulling stops, the keyring "shrinks" back into its original size.

My question is: If I do this over and over again, does the keyring loose up over time? In other words: If I repeat the pulling indicated by the blue arrows, does the distance D increase over time, even when there is no pulling force?

I assume that this might be a question of how big the pulling force is. Of course, If I let two trucks pull the keyring apart, it wont move back to its original size. I am talking about keyrings with 1cm in diameter and about 4kg of pulling force. Would that 4kg be enough to loosen up the keyring?

Thank you :)


13:55 UTC


Tungsten Sintering - Questions for decorative items

Hi all,

I’ve got a project I’m working on for making non-structural decorative parts that need a density that could only be achieved with something like Tungsten.

I’m reading that sintering of tungsten powder can be achieved by pressing the powder in a mold and then sintering at around 1300C in a flowing hydrogen atmosphere.

I read that it he hydrogen is useful over something like argon because it removes the binder.

I read that the parts can be tumbled and polished with a diamond grit after sintering.

But the overall process seems to be completely unavailable. How stupid would it be to press small parts and sinter at home in an electric tempering furnace rated for up to 2000C? How necessary is the hydrogen atmosphere? I have so many questions.

10:38 UTC


How is Bell Bronze made?

Forgive me, I’m a musician, but im curious. I’ve got a project I’m interested in.

Whats the process that turns cast bronze into bell bronze? Casting copper and tin yields B20 bronze. What annealing or tempering happens to make B20 bronze resonant? What’s happened to metal during this process? Thanks.

05:21 UTC


Strongest diy castable alloys

So I'm wanting to play around with some diy investment casting, making some mechanical part. I'm currently planning on using an aluminum bronze alloy maybe c95500. I'm planning on using a microwave forge as seen here in this video. https://youtu.be/P1VmIYheuU4?si=lqNq0p9o4LUaQprJ

My question is are there any other alloys of any metal that would both be friendly in a diy investment casting pour but stronger then what I can achieve with the aluminum bronze? My goals here are better achieved with steel. However Steels have a little to high of a melting point to play nice in the microwave. So my goal is to replace steel with a easier to work with metal while not sacrificing to much overall strength. Is there like any obscure superalloys worth investigating for something like this. Or maybe something better then c95500,.. aside from the beryllium copper alloys I read they will trash your lungs so not so diy friendly.

07:15 UTC



I fucked up big time and ruined my moms' new pan.Accidentally turned on an induction stove with an empty pan and it having a thin bottom, got to, I kid you not, glowing red.Now it has a nice purple and gold bottom that will spell out my doom.How can I fix it in the next 8h?

UPDATE: Thank you all for your responses. Couldn't find the Barkeeper's friend as one way to get it would be shipping it via amazon(am not american). Fortunately, found a place to hide it, and used my sister to sneakily get info where my mom bought it, hopefully, until I can get it she won't need it. Oh and it is stainless steel.



08:29 UTC


XRD interpretation help

Hi, i have this xrd analysis for 2 samples. The black one is a galvanized ASTM A53 steel plate, and the red one is the same plate with a micro silica-based coating (according to optical microscopy, it was successful). Idk what am I looking at exactly. I'd gladly accept any kind of help in order to find out what it is.


00:59 UTC


What does loctite do to a metal's surface?

Basically the title, just trying to understand what loctite or similar metal adhesives do to the metal's surface on microscopic and surface energy level. Any insight is appreciated!

22:31 UTC


Furnace Survey Question

We have a Pusher Style furnace that we use to heat, homogenize and roll 3xxx series, DC cast aluminum ingots.

We have a data pack that is attached to the ingot that allows us to survey temps throughout the cycle to ensure we meet our practice specs. Our goal is to use this data to tweak the process and heat faster.

Prepping this ingot is a lot of work. The equipment requires a corner to be cut off, the process of which is a safety concern.

My question is, if we reuse this same ingot after it has already been homogenized once, can we expect any significant change in how it heats up compared to homogenizing from its as-cast state? Ideally it would be great if we could reuse this survey ingot multiple times.

17:36 UTC


How many of you Metallurgists have Chemical Engineering degrees?

I’m in a bit of a predicament. Parents have threatened to kick me out of the house or change schools from the community college that I’m going to to a university. I’m studying for an associates in welding fabrication and an associates in materials and metallurgy. Thing is, my community college i’m at now is the only community college in michigan that offers an associates in metallurgy. I’m looking at Wayne State now wondering if I were to study chem engineering, how easy would it be to get into metallurgy after graduation?

21:03 UTC

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