| sammyg2 |
05-22-2019 06:22 AM |
Quote:
Originally Posted by GH85Carrera
(Post 10466764)
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They would have to looose nearly all physical characteristics from the hardening process.
Basically heat the crap out of it and let it gradually cool over a long time.
Either that, or they were cheep POS that were never properly hardened in the first place.
Quote:
Martensitic transformation, more commonly known as quenching and tempering, is a hardening mechanism specific for steel. The steel must be heated to a temperature where the iron phase changes from ferrite into austenite, i.e. changes crystal structure from BCC (body-centered cubic) to FCC (face-centered cubic). In austenitic form, steel can dissolve a lot more carbon. Once the carbon has been dissolved, the material is then quenched. It is important to quench with a high cooling rate so that the carbon does not have time to form precipitates of carbides. When the temperature is low enough, the steel tries to return to the low temperature crystal structure BCC. This change is very quick since it does not rely on diffusion and is called a martensitic transformation. Because of the extreme supersaturation of solid solution carbon, the crystal lattice becomes BCT (body-centered tetragonal) instead. This phase is called martensite, and is extremely hard due to a combined effect of the distorted crystal structure and the extreme solid solution strengthening, both mechanisms of which resist slip dislocation.
All hardening mechanisms introduce crystal lattice defects that act as barriers to dislocation slip.
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