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| Effect of heat treatment process on critical transformation and CCT curve of AISI4340 steel |
| WANG Chun-fang1，LI Yong2，LI Nan1，LU Yan1， LI Ji-kang1 |
（1. Center Laboratory， Central Iron and Steel Research Institute， Beijing 100081， China
2. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China） |
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Abstract The critical transformation temperature of AISI4340 steel was determined by thermal expansion method， and the microstructure and hardness were observed. The effects of heat treatment process on critical temperature and austenite continuous cooling transformation curve（CCT curve） were studied. The results show that the hardenability of the experimental steel is good. The austenite transformation product is bainite when the cooling rate is 0.03 ℃/s. The austenite transformation products are marensite and bainite when the cooling rates lie in range of 0.03-0.78 ℃/s and martensite when the cooling rate is greater than 0.78 ℃/s.[Ac1]and[Ac3]are different with different heat treatment processes and CCT curve is similar.[Ac1]of the unstability initial microstructure is lower than the equilibrium initial microstructure. Effect of different initial microstructure to[Ac1]is larger than[Ac3.]
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Received: 06 July 2016
Published: 10 March 2017
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2017, Vol. 52 
