Effect of Cooling Rate on Spheroidized Microstructure of GCr15 Bearing Steel

doi:10.12068/j.issn.1005-3026.2019.10.005

Abstract

Abstract: The effect of cooling rate after a simulated hot-rolling process on the microstructures of network carbide precipitation and subsequent divorced eutectoid transformation in GCr15 bearing steel was investigated using electron probe and transmission electron microscopy. The results indicated that the rapid cooling treatment in the range of pre-eutectoid carbide formation temperature can inhibit the formation of network carbides and reduce the inter-lamellar spacing of flaky pearlite in the steel.When the cooling rate is 20℃/s， the spheroidizing annealing time can be reduced to about 2h in divorcing eutectoid treatment and the hardness of the tested sample reaches 1.95GPa.The results from selected-area electron diffraction show that the type of spheroidal carbide in the steel after spheroidization is M₃C， which can not be changed by the regulation of cooling rate.

Key words: bearing steel, pearlite;spheroidizing annealing, network carbides, hardness

CLC Number:

TG335.5

HAN Dong-xu， DU Lin-xiu， WU Hong-yan， QI Min. Effect of Cooling Rate on Spheroidized Microstructure of GCr15 Bearing Steel[J]. Journal of Northeastern University Natural Science, 2019, 40(10): 1392-1397.

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