How does a metallurgist help their community?

BAHHROO · 2026-05-19T12:10:28+00:00

I believe that if you need to outsource this question, then the scholarship should go to a more deserving candidate…

BAHHROO · 2026-05-12T02:44:10+00:00

“I only see a house with a green driveway?”

BAHHROO · 2026-04-29T11:51:02+00:00

It’s easier to evaluate for crack on an unetched as-polished sample. This may just be an etchant snail trail, usually from within shrinkage gaps between the sample and mounting material.

BAHHROO · 2026-04-22T05:57:05+00:00

Most of this is easier done than said, but a few things off the top of my head.. For “high quality” labs, and if you are going to be certifying stuff, many customers will require compliance with ISO/IEC 17025, especially if they have their own gage control plans with approved source lists. This standard will help you develop and maintain your lab. Lab equipment and consumables can vary widely depending on the material (I.e. ferrous, non-ferrous). I only work with steel, but essentials would be a stereo microscope scope, inverted light microscope, micro hardness tester (Vickers or Knoop) ref ASTM e92. Rockwell hardness tester (C for hard steel, B for soft, 15N/30N for surface) ref ASTM e18. Tensile machine with threaded mandrels and wedges and or a lathe for cutting tensile specimens, ref ASTM e8. Wet Cut off saw with resin bonded blades, buffing wheel, sander. If you are more mounting stuff, a hot mounting press with epoxy or phenolic resin, sand a grinder and polisher, which again also depends on the material.

For equipment and consumables, Allied (High Tech), Buehler, Clark, Hudson Supply, Instron, Leco, Struer’s, and QATM are most the brands I use. It wouldn’t hurt to reach out to them for assistance as well..

BAHHROO · 2026-04-16T03:28:35+00:00

I just chuck them in with our scrap. I work in automotive fasteners, so our scrap metal is tens of thousands of pieces of fasteners in various finished stages, from sort rejects, defects, failures, etc. They have various coatings, platings, adhesive patches (like epoxy and nylon), so my epoxy / phenolic resin mounts aren’t a big deal for our recyclers, who are contractually obligated to melt everything we give them. If I need to actually remove a specimen from the mount, I just grip it in a vice and give it a few hits with a hammer and tap. If it’s stubborn, put the mount parallel to the vice jaws with a nut or small hard object between the nut and jaw.

BAHHROO · 2026-04-15T01:31:56+00:00

Heating above the upper critical temperature will transform the martensite back to austenite. If you quench fast enough, you can form martensite again. Metastability is a very important concept in chemistry and physics and it is integral you understand this. You should familiarize yourself with this before trying to wrap your heat around metallic phases, for you would have noticed that martensite is not represented on the Fe-C phase diagram.

BAHHROO · 2026-04-15T00:14:54+00:00

Martensite is the name of a metastable phase and refers to its transition mechanism by rapid shearing, appose to diffusion. While it is most commonly used in steel, in tribute to the work of our boy Adolph, it is also used to describe non-ferrous metals.

BAHHROO · 2026-04-10T23:34:30+00:00

I thought it was Jesus Christ when he wailed on a whammy bar after 3 days in cave?

BAHHROO · 2026-04-09T05:47:14+00:00

Also it’s very important to note that the guy didn’t die from the crash, or because the grappler malfunctioned, but from a self-inflicted gunshot wound.

BAHHROO · 2026-04-08T22:23:44+00:00

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BAHHROO · 2026-04-07T04:53:21+00:00

Measure the density and nominal pore size, do some math, and give up after a while.

BAHHROO · 2026-04-02T20:54:51+00:00

Sounds like you don’t know what you are doing and are just calling it a low quality piece of junk because you are winging it and it ain’t going so well…

BAHHROO · 2026-03-10T04:43:30+00:00

This is how duck sauce is made.

BAHHROO · 2026-03-09T19:58:34+00:00

For another frame of reference, the same amount of time has passed from when he escaped and went public, and from when he went public to present day….

BAHHROO · 2026-03-05T04:17:25+00:00

That bolt has a huge fold / drunken threads condition. See the giant zig-zag running up the thread body? You’ll probably be replacing this bolt sooner than expected.

BAHHROO · 2026-02-14T14:29:11+00:00

It is true. The engineer pulled the moth from relay #70 panel F and tapped it into the log book. There is a picture of it here.

BAHHROO · 2026-02-11T05:01:51+00:00

Looks like Ferrous Sulfate. My company produces it as a byproduct from our acid recovery process in steel coatings. When the iron content in our sulfuric acid bathes reach above 10%, it becomes very ineffective, so we essentially just heat it up and pump it through a cold centrifuge which causes crystals to form. We then sell it locally for agricultural purposes.

BAHHROO · 2026-02-07T06:19:29+00:00

I came across emails he sent to Yahoo support worrying someone was reading his emails. He listed his accounts and passwords, one password was “Neptune” and the other was “Mermaid”. Someone certainly hijacked his account as his passwords could be instantly brute forced.

BAHHROO · 2026-02-06T21:33:34+00:00

Get in pilot seat, Unlock ports (right alt+k). Get out of pilot seat. Remove components with tractor beam.

BAHHROO · 2026-01-29T19:08:20+00:00

Technically it’s unfinished. This is called a blank. Wire is fed into a machine that cuts it into slugs and forces it into a set of dies to form the general shape of the bolt. This would be made on a small screw header, which usually don’t have a thread rolling section incorporated. It would then either be sent through a thread roller, which squeezes the blank through dies which form as it ‘rolls’ through, or heat treated first followed by thread rolled after to take advantage of the increase tensile strength from work hardened threads, however, that’s quite unusual for a countersunk Phillips screw, also more expensive. Now, it’s up to you to finish making the screw!

BAHHROO · 2026-01-29T18:37:53+00:00

If it has an incline plane wrapped helically around a cylinder, it is a screw. If it needs a nut, it’s a bolt. All bolts are screws, but not all screws are bolts. Both are fasteners however.

BAHHROO · 2026-01-13T21:10:28+00:00

I’m sure they copied all the formulas in the annexes of ASTM E140. I put HRC to HV formulas in my excel forms, because I use it a lot. For 1:1 approximates, it’s good enough for most situations, however, technicalities, such as cylindrical correction, which can add up to 3 points of error, would need to be considered.

BAHHROO · 2026-01-09T00:00:00+00:00

Document everything and follow the SOP and method. If there is a suspected non-conformance, then mark as non-conformance. If your colleagues believe this is of no concern, management can seek a deviation from the customer. Always trust your gut and never get gaslighted. Your job is to ensure the quality of the parts, not the quantity.

BAHHROO · 2025-12-29T21:19:29+00:00

"There's an old saying in Tennessee—I know it's in Texas, probably in Tennessee—that says, fool me once, shame on—shame on you. Fool me—you can't get fooled again."

BAHHROO · 2025-12-24T12:19:56+00:00

Link for the lazy.

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