Control of the material factors that affect the bearing life, including which

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    In order to make the impact of material factors bearing life at its best, you first need to control the quenching of steel before the original organization, the technical measures can be ta ken are: high temperature (1050 ℃) austenitic-speed cooling to 630 ℃ temperature normalizing get pseudo fine pearlite eutectoid, or cold to 420 ℃ temperature treatment, to obtain bainite. Unwrought waste heat can be used to rapid thermal annealing, the fine granular pearlite to ensure that small and evenly distributed carbide steel. The original organization of this state in the quenching of austenitizing, in addition to integration into the carbide in austenite, undissolved carbides, will gather into a fine granular.angular ball bearing
When the original organization in the steel when quenched martensite carbon content (ie, quenching the austenite carbon content), the amount of retained austenite and undissolved carbides depends on the quenching temperature and hold time , as quenching temperature is increased (time certain), the undissolved carbides in the steel decrease in the number of (increased), the increase in the number of retained austenite in quenched martensite carbon content, hardness first increased with the increase of quenching temperature, peak and then decreases with increasing temperature. When quenching temperature is constant, with the extension of the austenitizing time, the number of undissolved carbides reduced the increase in the number of retained austenite, the hardness increased, a longer time, this trend has slowed. Fine carbides in the original tissue, due to the carbide easy integration into the austenite, so that the hardness after quenching peak toward lower temperatures and appeared in a short austenitizing time.cross bearing
In summary, GCr15 steel after quenching of undissolved carbides in about 7% of retained austenite in 9% (cryptocrystalline martensite, the average carbon content of about 0.55%) is the best organization. Moreover, when the original tissue carbide is small, evenly distributed, reliable control of the level of microstructure, is conducive to high mechanical properties, which has a high service life. It should be noted, has a small dispersion of the original organization of the distribution of carbides, quenching the heat insulation, the small amount of undissolved carbides gathering grew to coarsening. Therefore, with this original organization bearing parts quenching time not too long, rapid heating, quenching austenite process will receive the higher mechanical properties.
To make the bearing parts quenched surface residual large compressive stress after tempering, quenching the pass into the atmosphere of carburizing or nitriding, short-term surface carburizing or nitriding. Due to heating of the steel quenching austenite actual carbon content is not high, well below the equilibrium concentration of the phase diagram shows so you can suck car bon (or nitrogen). Austenite containing carbon or nitrogen, its Ms lower surface than the inner and center quenching martensite transformation occurs, resulting in a larger residual stress. After GCrl5 steel Hardening of the carburizing atmosphere and non-carburizing atmosphere (low temperature tempering) treatment, the contact fatigue test can be seen that the surface carburization of life not carburization increased 1.5 fold. The reason is carburized parts surface has a larger residual stress.angular bearing