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）
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.]
收稿日期: 2016-07-06
出版日期: 2017-03-10
引用本文:
王春芳，厉 勇，李 南，路 岩，李继康. 热处理对AISI4340钢临界点及CCT曲线的影响[J]. 钢铁, 2017, 52(3): 70-75.
WANG Chun-fang，LI Yong，LI Nan，LU Yan， LI Ji-kang. Effect of heat treatment process on critical transformation and CCT curve of AISI4340 steel. Iron and Steel, 2017, 52(3): 70-75.
Terzic A, Calcagnotto M, Guk S, et al.In?uence of Boron on Transformation Behavior during Continuous Cooling of Low Alloyed Steels[J]. Materials Science and Engineering A., 2013, 584:32–40.[J].Materials Science and Engineering A, 2013, 584(1):32-40
[2]
Terzic A, Calcagnotto M, Guk S, et al.In?uence of Boron on Transformation Behavior during Continuous Cooling of Low Alloyed Steels[J]. Materials Science and Engineering A., 2013, 584:32–40.[J].Materials Science and Engineering A, 2013, 584(1):32-40
LEE S, NA H, KIM B, et al.Effect of Niobium on the Ferrite Continuous-Cooling Transformation (CCT) Curve of Ultrahigh-Thickness Cr-Mo Steel[J].Metallurgical and Materials Transactions A, 2013, 44A(6):2523-2532
[4]
LEE S, NA H, KIM B, et al.Effect of Niobium on the Ferrite Continuous-Cooling Transformation (CCT) Curve of Ultrahigh-Thickness Cr-Mo Steel[J].Metallurgical and Materials Transactions A, 2013, 44A(6):2523-2532
[5]
Hanamura T, Torizuka S, Tamura S, et al.Effect of Austenite Grain Size on Transformation Behavior,Microstructure and Mechanical Properties of 01C–5Mn Martensitic Steel[J].ISIJ International, 2013, 53(12):2218-2225
[5]
Hanamura T, Torizuka S, Tamura S, et al.Effect of Austenite Grain Size on Transformation Behavior,Microstructure and Mechanical Properties of 01C–5Mn Martensitic Steel[J].ISIJ International, 2013, 53(12):2218-2225
2017, Vol. 52 
