Quote:
Originally Posted by steelslaver
Yes that is some huge grain structure. Should not look like that at all. Something went wrong i the process somewhere.
Before the MIM haters start in, think about this.
I purchased 6 2'x3' pieces of high grade German D2 tool steel 3/16" thick. This was rolled sheet so it had been "forged" repeatedly in the process from taking it from a billet to sheet. I had 2 sheets of it water jet cut to a pattern I use to make my standard hunting knife. On one of the blades after grinding the bevels and working to 400 grit sanding there was a small line that would not sand out. I took it back to the belt sander and it still remained after hitting that area again. Put it in a vise and applied side pressure. Snap and at the break an inclusion was visible. Forged is not immune to failure either. This was a steel that was poured into a billet from an inert atmosphere, induction oven, before being hit with the hammers and rollers to reduce it. Top shelf processes by people who pride themselves in their abilities.
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Solid post and I fully agree that forgings are not immune to improper manufacturing. I don't hate all MIM parts at all. But situations like in the OP's is exactly why I put 250 full house loads thru my new or new to me revolvers and at least 500 thru any semiauto before strapping it on my side. I like to get 500 or so dry fires as well (using AZoom snap caps ofcourse), thru any new to me pistol/revolver! If anything is going to break or hiccup it's probably going to happen during the above break in. Sounds like the OP was on his way to doing exactly what I do in regards to dry-firing.