Influence of materials imported bearing life factors at its best, we first need to control before the original organization steel quenching can take the technical measures are: high temperature (1050 ℃) austenitic change speed to 630 ℃ cold isothermal quenching get GongXi fine pearlite false organization, or cold to 420 ℃ isothermal processing, access to bainite organization. INA bearing also can use forged waste heat fast annealing, get fine granular pearlite organization to ensure the carbide steel small and evenly distributed. This state of the original organization in quench heating austenitic change, in addition to dissolve into the austenite carbide outside, not dissolve carbide will gather to fine granular.

When the original organization must steel, the carbon content of hardened martensitic (namely after quench heating of austenite content), remains austenitic volume and not dissolve carbide amount depends mainly on quenching temperature and keep time, along with the quench heating temperature increases (time must), not dissolve in steel the decrease in the number of carbide (hardened martensitic increased carbon content), remains austenitic increasing number, hardness is first with the quenching temperature increases with the increase again after a peak with the rise of temperature and reduced. IKO bearing when heating temperature must be quenched, along with the austenitic change the extension of time, not dissolved reducing the number of carbide, remains austenitic increasing number, hardness higher, when time is longer, this trend slows down. When the original organization carbide fine hour, for carbide easy to dissolve into austenitic, so make harden hardness peak temperature and low move to appear in a relatively short period of austenite of time.

To sum up, GCrl5 harden steel not dissolve carbide after at about 7%, remains austenitic at around 9% (implicit crystal martensite in 0. The average carbon content about 55%) is the best of organization. And, when the original organization small carbide, uniform distribution, reliable control in the level of microstructure was formed, FAG to get high bearing the comprehensive mechanical performance, so as to have a high service life. It should be pointed out that, with small carbide dispersion distribution original organization, quenching heat insulation, not dissolve in the small carbide will grow up together, make its coarsening. So, to have this original organization bearing parts quench heating time shoulds not be too long, the rapid heating austenitic the quenching process, will get higher comprehensive mechanical properties.

 
In order to make TIMKEN bearings components after quenching and surface residual larger compressive stress, can be in quench heating all carbon or permeability of infiltration nitrogen atmosphere, the short time to surface carburized or filter nitrogen. Because of this steel quenching heat austenitic actual carbon content is not high, is far lower than the phase diagram shows on the balance of concentration, so it can absorb carbon (or nitrogen). When austenitic contains high carbon or nitrogen, the Ms is reduced, the inner surface is hardened and happened after the martensite transformation, and has gained great residual stress. GCrl5 steel to carburizing atmosphere and the carburizing atmosphere heating quenching (both by low temperature tempering) processing, through the contact fatigue test can see, surface carburized life spans than not carburizing is improved by 1.5 times. The reason is the surface carburized parts with larger residual stress.



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