Effect of quenching temperature on microstructure and friction and wear properties of GCr15 bearing steel cycloid wheel
Microstructure,phase and hardness of GCr15 bearing steel cycloid wheel after quenching at different temperatures and low-temperature tempering treatment were analyzed,and its friction and wear properties were tested and characterized by friction and wear tester and laser confocal microscopy.The results show that after quenching at different temperatures and low-temperature tempering treatment,the microstructure of the specimen is mainly composed of martensite,carbide and retained austenite.With the increase of quenching temperature,the average size and volume fraction of carbides in the specimen gradually decrease,the content of martensite also gradually decreases,while the content of retained austenite gradually increases,and the hardness first increases and then decreases.The friction coefficient and wear rate of the specimen first decrease and then increase with the increase of quenching temperature,and the wear mechanism is mainly abrasive wear.When the quenching temperature is 840 ℃,the wear of the specimen is the least,and the wear resistance is the best.
quenching temperaturecycloid wheelmicrostructurefriction and wear
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