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| Effect of heat treatment process on microstructure and mechanical properties of 20Cr1Mo1VTiB steel |
| GONG Xue-ting1，WU Zhi-guang1，LI Xin1，ZHAO Meng-ya2，PENG Tao2 |
（1. Reactor Engineering Technology Research Division， China Institute of Atomic Energy， Beijing 102413， China
2. Collaborative Innovation Center of Steel Technology， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract In order to optimize the heat treatment process of 20Cr1Mo1VTiB steel，the effect of heat treatment process on microstructure and mechanical properties of the steel was investigated experimentally by means of SEM，TEM and mechanical properties tests. The results show that the heat treated microstructure of 20Cr1Mo1VTiB steel is bainite，and the main strengthening phase is VC and needle-like M3C. With elevating the quenching temperature，the room and high temperature tensile strengths increase while the toughness decreases duo to the gradual dissolving of VC into the matrix and the increase of solid solution strengthening effect. When the steel is tempered at low temperature，the dislocation density in bainite laths is very high and the microstructure stress is great. This leads to high strength and low toughness of the steel. While with increasing the tempering temperature，the room and high temperature tensile strengths decrease and the toughness improves significantly as a result of an increase in VC size and the gradual recovery of the microstructure. 20Cr1Mo1VTiB steel shows a good combination of strength and toughness after quenching at 1 030 ℃ and tempering at 720 ℃.
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Received: 11 June 2018
Published: 24 December 2018
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2018, Vol. 53 
