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| Effect of tempering process on microstructure and mechanical properties of 900 MPa grade hot rolled steel |
| LIU Xu-hui1，ZENG Bin1，LIANG Liang1，LI Zhao-dong2 |
（1. Technical Center， Hunan Valin Lianyuan Iron and Steel Co.， Ltd.， Loudi 417009， Hunan， China
2. Department of Engineering Steels， Central Iron and Steel Research Institute， Beijing 100081， China） |
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Abstract Yield strength 900 MPa grade high strength steel gradually used in the construction machinery，automobiles and other vehicles. Differently from the 900 MPa grade steel by traditional production process and strengthening mechanism，the Ti-V alloyed 900 MPa grade steel produced by TMCP process was used as the raw material. By experiment different heat treatment processes，the effects of microstructure and mechanical properties were studied. The results show that the elongation rate of the steel sheet is not changed greatly after the tempering heat treatment，and the impact toughness is obviously improved. The strength and hardness are obviously improved from 550 to 650 ℃，but they decline obviously between 650 and 700 ℃. On the microstructure aspect，there is no significant change was observed，but a part of ferrite grains grew. The solid solution Ti，V，Mo elements in hot rolled materials continue to precipitate in the form of （Ti， Nb， Mo）C，resulting in precipitation hardening，at 700 ℃ high temperature，the coarse carbides were formed.
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Received: 11 May 2018
Published: 26 October 2018
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2018, Vol. 53 
