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| Effect of heat treatment process on creep-rupture property of 20Cr1Mo1VTiB bolt steel |
| WU Zhi-guang1, GONG Xue-ting1, LI Xin1, ZHAO Ji-qing2, GONG Zhi-hua2 |
1. Reactor Engineering Technology Research Department, Atomic Energy Institute of China, Beijing 102413, China;
2. Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract In order to verify the creep-rupture performance of 20Cr1Mo1VTiB bolt steel under the national and Russian standard heat treatment processes,the effects of two standard heat treatment processes on the structure and creep-rupture properties of 20Cr1Mo1VTiB bolt steel were studied by means of SEM and TEM. The results show that high-temperature quenching+high-temperature tempering (GB) has higher durability and stability than low-temperature quenching+low-temperature tempering (Russian standard) process. The Russian standard process has a low quenching temperature,a large amount of square (diamond) undissolved massive Ti-rich carbides with a large size distributed in the bainite,which promotes the formation of creep holes,and leading to the rapid decrease of creep-rupture strength. The Chinese standard process has a high quenching temperature,most of the Ti-rich carbides were dissolved into the matrix,lot of fine particles of VC with good thermal stability precipitated during tempering,and the creep-rupture strength was improved. Thus,it was more reasonable using high temperature quenching and tempering.
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Received: 25 December 2019
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2020, Vol. 55 
