In order to make the material factors influencing bearing life at its best, you first need to controlling quenching steel before the original organization, technical measures that could be taken were: high temperature (1050 ° c) speed of austenite cooling to 630 ° c isothermal normalizing were thin pseudo-eutectoid pearlitic structure, or cold to 420 ° c isothermal treatment, access to Bainite organization. Or forging and rolling heat rapid thermal annealing, access to fine grain pearlitic structure, to ensure small carbides in steel and evenly distributed. This original organization hardened when heating austenitic, in addition to the carbides into austenite, and undissolved carbides are gathered into fine granular.
Dang steel in the of original organization must Shi, quenching horse's body of containing carbon volume (that quenching heating Hou of Olympics's body containing carbon volume), and residues Olympics's body volume and is not dissolved carbide volume main depends on quenching heating temperature and maintained time, as quenching heating temperature increased (time must), steel in the is not dissolved carbide number reduced (quenching horse's body containing carbon volume increased), and residues Olympics's body number increased, hardness is first as quenching temperature of increased and increased, reached peak Hou and as temperature of rise and reduced. When hardening heating temperature when you must, with austenitic extension of time, fewer undissolved carbides, increased residual austenite quantity, increase hardness, a long period of time, this trend is slowing. When the original organization of fine carbide in hours, easily soluble carbides into austenite, so moved to the lower temperatures and quenched hardness peaks occur in a relatively short time of austenitic.
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