Prediction of Dimensional Change of GCr15 Bearing Steel during Aging Based on Quenched and Tempered Microstructure

doi:10.3901/JME.2019.12.064

Abstract

Abstract: The dimensional change and its stability of bearing steel during service are of great importance to the precision retaining ability and service performance of bearings. To forecast the dimensional changes of bearing steel during aging, a prediction model based on microstructure state of quenched and tempered high carbon chromium bearing steel is proposed. According to the microstructure transformation kinetics and unit cell volume during tempering, a tempering dimension change model is established and the predicted dimensional changes are in good agreement with the experimental results. Based on the prediction model, the effects of quenching and tempering process on the dimensional changes of aging stage are analyzed. The analysis results show that the quenching process determines the upper and lower limits of dimensional change during aging, and the upper limits increase with the increase of heating temperature. Tempering process determines its starting point, and increasing tempering temperature can significantly reduce the dimensional change during aging. The results also show that quenched GCr15 bearing steel can obtain high dimensional stability after isothermal tempering at 180℃ for 2 h. This prediction model can provide the theoretical basis for the prediction of dimensional changes during aging and the optimization of quenching and tempering process for high carbon chrome bearing steel.

Key words: aging, dimensional stability, GCr15 bearing steel, quenching and tempering

CLC Number:

TG151

LIU Qinglong, WEI Wenting, HUA Lin. Prediction of Dimensional Change of GCr15 Bearing Steel during Aging Based on Quenched and Tempered Microstructure[J]. Journal of Mechanical Engineering, 2019, 55(12): 64-71.

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