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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
Citation: 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
    Graphical Abstract
    • 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.
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    • References (11)
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