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| Design Standard and Analysis of Ageing Process in High Co-Ni Secondary Hardening Steel |
Chenchong WANG1,Chi ZHANG1( ),Zhigang YANG1,Jie SU2,Yuqing WENG2 |
1 Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2 Central Iron and Steel Research Institute, Beijing 100081, China |
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Cite this article:
Chenchong WANG,Chi ZHANG,Zhigang YANG,Jie SU,Yuqing WENG. Design Standard and Analysis of Ageing Process in High Co-Ni Secondary Hardening Steel. Acta Metall Sin, 2017, 53(2): 175-182.
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Abstract High Co-Ni secondary hardening steels have received great attention for a long time. In several decades, many previous studies were made to improve their strength, toughness, corrosion resistance ability and even stress corrosion sensibility. Although many new kinds of high Co-Ni secondary hardening steels were developed by researchers, the mechanisms of strength and toughness were still a problem, which would inhibit the further development of high Co-Ni secondary hardening steels. In this work, both microstructure and mechanical properties of high Co-Ni secondary hardening steels were analyzed by simulation and experiment. The strengthening and toughening mechanism was explained, which included the transformation induced plasticity (TRIP) effect of austenite layer in nanometer size and the precipitation of M2C in nanometer size. According to the previous studies about AerMet100 steel, the design standard for high Co-Ni secondary hardening steels was established, which included the mole volume change for austenite, the stability of austenite, the austenite thickness, the austenite equilibrium content, the M2C size, the M2C equilibrium content and cost control. Based on this design standard, the ageing process for a new high Co-Ni secondary hardening steel was analyzed. By controlling the ageing process as 515 ℃ for 10 h, based on the design standard, M2C with the size of 1~5 nm and austenite layers with the thickness of 10~20 nm was formed in new high Co-Ni secondary hardening steels. The equilibrium content of M2C and austenite layers were controlled as 19.5% and 3.8%, respectively. The simulation results were basically consistent with the microstructure observation results. The high Co-Ni secondary hardening steel treated by the designed heat treatment process has considerable strength (2021 MPa) and toughness (115 MPam1/2). Both simulation and experimental results showed that this design standard of ageing process for high Co-Ni secondary hardening steels can help to obtain steels with high strength and toughness.
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Received: 03 May 2016
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| Fund: Supported by National Natural Science Foundation of China (Nos.51171087 and 51471094) |
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