Hi, I’m a university student and I need help finding formats or examples of failure analysis reports to use as a guide.

For fun, I compared the colors of a few 9mm bullet projectiles, and I noticed that the bullets by Magtech were much more yellow than the others, and looked almost exactly the same color as the brass casing.

Does anyone here know if brass is used for projectiles, and what might the benefits be over copper? Magtech seems to be something of a "budget" brand, so maybe they are using brass if it's cheaper than copper?

I also noticed that Blazer and Remington had a very pink kind of copper, while Federal and Winchester had more of an orange copper. Does anyone know what might cause this color difference? Is pure copper more pink or more orange naturally?

Hi! My late grandfather made this cribbage board at the Portsmouth, NH Navy Shipyard in the 80's or 90's. I am trying to confirm what type of metal it is so I can clean it without risking any damage. Any ideas or any info that would help identify?

The shaft failed near where the balloon leader for item 2 terminates. Basically at the end of the smaller spline where it mates with the sun gears. Is this a bending fatigue issue or a torsional fatigue issue?

Found these small chips of metal outside in a baggie labeled ”Silver Only” however it was clearly very old and had probably been used for a long time.

They‘re nonmagnetic, density is somewhere around 9.355 g/mL but I don’t have the best equipment for that, extremely soft to the point of bending it with my hands. The tarnish on them came off pretty easy when I rubbed them with my thumb and was super dark.

Any chance I’ve got something valuable on my hands? Any tests I can do to be more sure? Any way to purify this using only amateur chemistry equipment?

There's something oddly satisfying about it.

In the 1980's one of the popular car magazines wrote that there was an unpainted German car body prominently exhibited, presumably for years, outside the facilities of the manufacturer and that it showed no rust.

So why do most car bodies eventually rust even in areas where has been no collision and paint damage?

Is this metallurgy related? Would love to know the process behind this change in surface color.

My dad's been collecting various metals and scrapping and I want to start melting it down and casting to somee blocks ....generally aluminum , tin , copper, brass , and lead ....please provide some suggestions for some set ups , not sure I know what's all needed to start

I recently refound my grandfathers and great grandfathers casing from their funerals, about 5 casings total of 30-06 SPRG blanks. Ultimately my goal is to turn it into a workable ingot/alloy to make into jewelry for my mom . Is it worth trying to make into an alloy or is it better to find another way to repurpose these casings as i would rather not make the stereotypical bullet casing/shell jewlery.

Seen next to a local integrated steel plant.

Hey all, I was wondering what is my necklace and what is it supposed to be? It says 14k on it and I just use it to hold a religious pendant I have and found it on the ground years ago. I know it's not a precious metal from the wear but I'm curious, what is it trying to look like? What is it really? Not magnetic, feels heavy I think.

I'm about to start my own cylinder liner and sleeve manufacturing unit, and want to start learning more about metallurgy. Which book is the best place to start, is it "Introduction to Metallurgy" by Alan Cottrell.

This is a pivot pin for a shear die, made from annealed 4140. The middle plate over the grease groove moves on the pin, held stationary by plates on either side that make up the die frame. It handles a lot of force, but Im wondering if it was broken by a shear force or if it was twisted apart. If it was twisted, I can encourage the customer to grease more, but if it was sheared maybe I'll look into stronger material options. Any thoughts are appreciated. Thank you!

Edit: Additional pics

Hi again,

Ive received a new set of the previous bicycle forks, after a not so thorough inspection ive found this on one dropout

Is this purely cosmetic or should i get a replacement?

Thank you for your time

Aluminium gets you better passive heat dissipation, lower weight, and solid corrosion resistance. Steel gives you max impact resistance and structural toughness for heavy-duty environments.

In practice, though, what's your go-to? Have you ever had aluminium fail where steel was strictly necessary (or found steel to be overkill/too heavy)?

Curious to hear your take on enclosure materials for industrial hardware deployments.

I am nearly finished restoring this cast iron tea kettle. The steel handle has me stumped though. It's very corroded. I tried cleaning it with oxalic acid, and citric acid, and rubbing it with metal polishing wadding.

Is there any way to restore the passivation layer once I get it cleaned up? (Assuming I can get it cleaned up).

Help me
Please

I am curious as to which specific chemical reactions and products occur during the process of corrosion of stainless steel by bleach. Stainless steel is an alloy of Fe, Cr, and sometimes other metals such as Ni, and the outer layer of this composite is protected by a passivation layer of Cr2O3. If sodium hypochlorite is introduced, does it indiscriminately oxidize both the Fe and Cr, or is one kinetically favored over the other?

Any advice or projects i can do from home before I start my bachelors in metallurgy and materials engineering like maybe online or anything i can work on field related?

Hi reddit! I want to use TLP brazing method to join two similar high entropy alloy pieces with identical dimensions of 2 mm. I am using a 50 micron bni-2 interlayer for the bonding. Can anyone help me how can I go through the preparation steps? As the samples are thin and can barely be held by hand, is there a specific polishing technique? Also, can I use the same bonding fixture I used for a 5mm thick sample before or a smaller fixture setup is needed? Thanks!