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| Effect of Cooling Rate on Microstructure and Properties of 10Ni5CrMo Steel |
| TIAN Jing-yun1,2,LUO Zhi-jun3,SHEN Jun-chang2,SU Hang2,SHANG Jian-li1 |
1. Xi’an University of Architecture and Technology School of Material Science and Engineering, Xi’an 710055, Shaanxi, China
2. Structure Materials Research Institute, Certral Iron and Steel Research Institute, Beijing 100081, China
3. Shougang Research Institute of Technology, Beijing 100043, China |
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Abstract The simulated continuous cooling transformation curve of 10Ni5CrMo steel was made by Gleeble-1500. By the metallographic analysis, the rules of phase transformation change of 10Ni5CrMo at different cooling rate were investigated. The results show that when cooling rate is lower than 0.2℃/s, the microstructure is granular bainite.When cooling rate is up to 0.5℃/s, the microstructure is granular bainite a lower bainite. When cooling rates is between 1℃/s and 2℃/s, the main microstructure of the 10Ni5CrMo steel is the combination of the bainite and martensite. When cooling rates increase further, the microstructure is simple martensite. In order to study the cooling rates to the affect of the strength and low temperature toughness, different cooling process simulation experiment was carried out in the lab and tested the stretching and impact. The results show that the strength of the different cooling ways is similar and low-temperature impact toughness is improved. Fine structure of different cooling way was in-depth analysised. The test results indicate that block and packet size can be refined. Low-temperature impact toughness of 10Ni5CrMo steel can be increased by controlling proper proportion of bainite and martensite.
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Received: 08 November 2011
Published: 14 January 2013
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2012, Vol. 47 
