Michaeljp86
EVIL GENIUS
I was wondering if anyone knows about having your crankshaft cryogenically treaded? If you done know what that is I guess the freeze it so cold it causes the steel to become super strong. I read about a guy doing that to a chevy 350, he had almost all the parts treaded and claimed the engine should go 300,000 easy. Since the crankshafts seem to be a weak spot I thought maybe this could be a good route to go. Im not sure about the cost. I know its not cheap but maybe it would be cheaper and stronger then a scat crank.
Cryogenic hardening
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Cryogenic hardening is a heat treatment in which the material is cooled to cryogenic temperatures to the order of -185 °C, usually using liquid nitrogen. It can have a profound effect on the mechanical properties of certain steels, provided their composition and prior heat treatment are such that they retain some austenite at room temperature. It is designed to increase the amount of martensite in the steel's crystal structure, increasing its strength and hardness, sometimes at the cost of toughness. Presently this treatment is being practiced over tool steels, high-carbon, and high-chromium steels to obtain excellent wear resistance. Recent research [1] shows that there is precipitation of fine carbides (eta carbides) in the matrix during this treatment which imparts very high wear resistance to the steels.
The transformation from austenite to martensite is mostly accomplished through quenching, but in general it is driven farther and farther toward completion as temperature decreases. In higher-alloy steels such as austenitic stainless steel, the onset of transformation can require temperatures much lower than room temperature. More commonly, an incomplete transformation occurs in the initial quench, so that cryogenic treatments merely enhance the effects of prior quenching.
It should be noted that the transformation between these phases is instantaneous and not at all dependent upon diffusion, and also that this treatment causes more complete hardening rather than moderating extreme hardness, both of which make the term "cryogenic tempering" technically incorrect.
Hardening can also be accomplished by cold work at cryogenic temperatures. The defects introduced by plastic deformation at these low temperatures are often quite different from the dislocations that usually form at room temperature, and produce materials changes that in some ways resemble the effects of shock hardening. While this process is more effective than traditional cold work, it serves mainly as a theoretical test bed for more economical processes such as explosive forging.
Many alloys that do not undergo martensitic transformation have been subjected to the same treatments as steels--that is, cooled with no provisions for cold work. If any benefit is seen from such a process, one plausible explanation is that thermal expansion causes minor but permanent deformation of the material.
Cryogenic hardening
From Wikipedia, the free encyclopedia
(Redirected from Cryogenic tempering)
Jump to: navigation, search
Cryogenic hardening is a heat treatment in which the material is cooled to cryogenic temperatures to the order of -185 °C, usually using liquid nitrogen. It can have a profound effect on the mechanical properties of certain steels, provided their composition and prior heat treatment are such that they retain some austenite at room temperature. It is designed to increase the amount of martensite in the steel's crystal structure, increasing its strength and hardness, sometimes at the cost of toughness. Presently this treatment is being practiced over tool steels, high-carbon, and high-chromium steels to obtain excellent wear resistance. Recent research [1] shows that there is precipitation of fine carbides (eta carbides) in the matrix during this treatment which imparts very high wear resistance to the steels.
The transformation from austenite to martensite is mostly accomplished through quenching, but in general it is driven farther and farther toward completion as temperature decreases. In higher-alloy steels such as austenitic stainless steel, the onset of transformation can require temperatures much lower than room temperature. More commonly, an incomplete transformation occurs in the initial quench, so that cryogenic treatments merely enhance the effects of prior quenching.
It should be noted that the transformation between these phases is instantaneous and not at all dependent upon diffusion, and also that this treatment causes more complete hardening rather than moderating extreme hardness, both of which make the term "cryogenic tempering" technically incorrect.
Hardening can also be accomplished by cold work at cryogenic temperatures. The defects introduced by plastic deformation at these low temperatures are often quite different from the dislocations that usually form at room temperature, and produce materials changes that in some ways resemble the effects of shock hardening. While this process is more effective than traditional cold work, it serves mainly as a theoretical test bed for more economical processes such as explosive forging.
Many alloys that do not undergo martensitic transformation have been subjected to the same treatments as steels--that is, cooled with no provisions for cold work. If any benefit is seen from such a process, one plausible explanation is that thermal expansion causes minor but permanent deformation of the material.
