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| Effect of quenching and low temperature treatment on microstructure and properties of X30 CrMoN 15 1 |
| CHEN Hao1，2，XU Haifeng2，ZHOU Tianpeng1，2，CHEN Zejun1，#br#
YU Feng2，CAO Wenquan2 |
(1. School of Materials Science and Engineering， Chongqing University， Chongqing 400044， China；
2. Institute of Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China)
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Abstract In order to explore the optimum quenching and cryogenic treatment process for X30 CrMoN 151 high nitrogen martensitic steel，the effects of different quenching temperatures and cryogenic treatment on the microstructure and properties of high nitrogen steel were studied by OM，XRD，SEM，EDS and EBSD. The results show that when the austenitizing temperature is lower than 1 050 ℃，the original austenite grain growth is slow，and when the austenitizing temperature is higher than 1 050 ℃，the grain grows sharply. As the austenitizing temperature increasesed，the carbide dissolution increases，and the retained austenite increases linearly after quenching in oil. After the low temperature treatment，the retained austenite decreases greatly，and the higher the austenitizing temperature，the more the retained austenite drop after cold treatment. The hardness of the steel increases first and then decreases with the austenitizing temperature，and the hardness is highest at 1 000 ℃. After the low temperature treatment，the hardness first rises and then decreases with the austenitizing temperature，and the hardness is highest at 1 030 ℃. The impact toughness of steel increases first and then decreases with austenitizing temperature. The impact toughness is best at 1 030 ℃. After low temperature treatment，the impact toughness of steel decreases greatly.
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