Dissolution of Second Phase during Austenitization and Characteristics of Quenching Phase Transformation in SV30 Bearing Steel

FANG Zhibo; ZHANG Yanjun; MIN Yongan; GU Jiaming; CHEN Pengfei

doi:10.11973/jxgccl201802003

Materials and Mechanical Engineering > 2018 > 42(2): 13-17,68. > DOI: 10.11973/jxgccl201802003

FANG Zhibo, ZHANG Yanjun, MIN Yongan, GU Jiaming, CHEN Pengfei. Dissolution of Second Phase during Austenitization and Characteristics of Quenching Phase Transformation in SV30 Bearing Steel[J]. Materials and Mechanical Engineering, 2018, 42(2): 13-17,68. DOI: 10.11973/jxgccl201802003

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Dissolution of Second Phase during Austenitization and Characteristics of Quenching Phase Transformation in SV30 Bearing Steel

1. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. Shanghai Tian'an Bearing Co., Ltd., Shanghai 200233, China

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Received Date: December 14, 2016
Revised Date: September 03, 2017

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Abstract

SV30 bearing steel was quenched at 990-1 070℃ for 10 min and at 1 030℃ for 0-100 min by DIL805A dilatometer. The microstructure, hardness, residual austenite content of the tested steel before and after quenching were studied. The dissolution of second phase and characteristics of quenching phase transformation were analyzed. The results show that when the quenching temperature rose from 990℃ to 1 070℃, the dissolution rate of M₂₃C₆ carbides in the steel became quicker. M₂N nitrides dissolved in large quantities only when the temperature reached 1 050℃ or higher. When holding at 1 070℃ for 10 min, the carbides were completely dissolved into the austenite while about 6.3wt% nitrides still remained undissolved. After quenching at 1 010-1 030℃ for 10-30 min, the hardness of the tested steel reached over 58 HRC; after quenching at 1 030-1 070℃, the residual austenite of about 30vol%-50vol% were retained in the tested steel.
- high-nitrogen bearing steel,
- austenitization,
- nitride,
- quenching phase transformation

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