Effect of tempering process on microstructure and mechanical properties of 900 MPa grade hot rolled steel
LIU Xu-hui1，ZENG Bin1，LIANG Liang1，LI Zhao-dong2
（1. Technical Center， Hunan Valin Lianyuan Iron and Steel Co.， Ltd.， Loudi 417009， Hunan， China 2. Department of Engineering Steels， Central Iron and Steel Research Institute， Beijing 100081， China）
Abstract：Yield strength 900 MPa grade high strength steel gradually used in the construction machinery，automobiles and other vehicles. Differently from the 900 MPa grade steel by traditional production process and strengthening mechanism，the Ti-V alloyed 900 MPa grade steel produced by TMCP process was used as the raw material. By experiment different heat treatment processes，the effects of microstructure and mechanical properties were studied. The results show that the elongation rate of the steel sheet is not changed greatly after the tempering heat treatment，and the impact toughness is obviously improved. The strength and hardness are obviously improved from 550 to 650 ℃，but they decline obviously between 650 and 700 ℃. On the microstructure aspect，there is no significant change was observed，but a part of ferrite grains grew. The solid solution Ti，V，Mo elements in hot rolled materials continue to precipitate in the form of （Ti， Nb， Mo）C，resulting in precipitation hardening，at 700 ℃ high temperature，the coarse carbides were formed.
收稿日期: 2018-05-11
出版日期: 2018-10-26
引用本文:
刘旭辉，曾 斌，梁 亮，李昭东. 回火工艺对900 MPa级热轧卷板组织与性能的影响[J]. , 2018, 53(10): 74-78.
LIU Xu-hui，ZENG Bin，LIANG Liang，LI Zhao-dong. Effect of tempering process on microstructure and mechanical properties of 900 MPa grade hot rolled steel. Iron and Steel, 2018, 53(10): 74-78.
X N Wang, Q Sun, L X Du, H S Di.MPa Grade Steel for Heavy-Duty Truck Development and Carriage lightweight design[J].Reviews on Advanced Materials Science, 2013, 33(2):187-194
[5]
X N Wang, Q Sun, L X Du, H S Di.MPa Grade Steel for Heavy-Duty Truck Development and Carriage lightweight design[J].Reviews on Advanced Materials Science, 2013, 33(2):187-194
Reidar Bjorhovde.Performance and Design Issues for High Strength Steel in Structures[J].Advances in Structural Engineering, 2010, 13(3):403-411
[10]
Reidar Bjorhovde.Performance and Design Issues for High Strength Steel in Structures[J].Advances in Structural Engineering, 2010, 13(3):403-411
[11]
Z Y Hou, Y B Xu, D Wu, W H Sun, S E Hu, G D Wang.Microstructure and Mechanical Properties of ULCB Steels affected by advanced TMCP Technology[J].Materials Science Forum, 2011, 689(1):289-295
[11]
Z Y Hou, Y B Xu, D Wu, W H Sun, S E Hu, G D Wang.Microstructure and Mechanical Properties of ULCB Steels affected by advanced TMCP Technology[J].Materials Science Forum, 2011, 689(1):289-295
Xinping Mao, Xiangdong Huo, Xinjun Sun, Yizhong Chai.Strengthening mechanisms of a new 700MPa hot rolled Ti-microalloyed steel produced by compact strip production[J].Journal of Materials Processing Technology, 2010, 210(12):1660-1666
[13]
Xinping Mao, Xiangdong Huo, Xinjun Sun, Yizhong Chai.Strengthening mechanisms of a new 700MPa hot rolled Ti-microalloyed steel produced by compact strip production[J].Journal of Materials Processing Technology, 2010, 210(12):1660-1666
[14]
Yoshimasa FUNAKAWA, Tsuyoshi SHIOZAKI, Kunikazu TOMITA, Tetsuo YAMAMOTO, Eiji MAEDA.Development of High Strength Hot-rolled Sheet Steel Consisting of Ferrite and Nanometer-sized Carbides[J].ISIJ International, 2004, 44(11):1945-1951
[14]
Yoshimasa FUNAKAWA, Tsuyoshi SHIOZAKI, Kunikazu TOMITA, Tetsuo YAMAMOTO, Eiji MAEDA.Development of High Strength Hot-rolled Sheet Steel Consisting of Ferrite and Nanometer-sized Carbides[J].ISIJ International, 2004, 44(11):1945-1951
2018, Vol. 53 
