Influence of heat treatment on microstructure and properties of Mo-containing bearing steel

doi:10.13251/j.issn.0254-6051.2022.07.022

Abstract

Abstract: Phase change law and influence of heat treatment on microstructure and properties of Mo-containing bearing steel were investigated. The microstructure was characterized by using SEM and XRD, the CCT curves were drawn, the micro-hardness, mechanical properties and wear resistance were tested. The results indicate that Mo contained in the tested steel postpones the transformation of pearlite, and only martensite transformation occurs while the cooling rate is higher than 4 ℃/s. When quenched and low-temperature tempered, the tensile strength and micro-hardness is 1850 MPa and 785 HV, respectively, while 2160 MPa and 735 HV when austempered. The volume fraction of retained austenite is 12.68% when quenched and low-temperature tempered, while 3.88% when austempered. The reduction of the retained austenite content contributes to the dimensional stability of the bearing steel.

Key words: Mo-containing bearing steel, microstructure, properties, carbide

CLC Number:

TG156.1

Xu Rongchang, Wang Yi, Sun Zonghui, Li Hui. Influence of heat treatment on microstructure and properties of Mo-containing bearing steel[J]. Heat Treatment of Metals, 2022, 47(7): 125-128.

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