|
|
Investigation of Retained Austenite and Its Stability in TRIP Steel |
IANG Haitao1,TANG Di1,LIU Qiang1,LIU Rendong2,YAN Ling2 |
1. National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Technology Centre, Anshan Iron and Steel Group Co., Anshan 114009, Liaoning, China) |
|
|
Abstract The retained austenite and its stability of transformation induced plasticity (TRIP) steel after isothermal bainitic transformation were investigated using SEM, TEM and XRD. The results showed that the amount of retained austenite is increased with increase of temperature or holding time of isothermal bainitic treatment in the range of 400440 ℃ and 120300 s respectively. At the same time the carbon content of retained austenite is decreased. It was found that the retained austenite is occurred in the forms of relative large particles, thin film and small globular particles. Obviously large retained austenite is unstable,thin film is more stable and fine globular particles are most stable.The combined formability of TRIP steel is deteriorated due to insufficient amount of retained austenite or reduced carbon content in retained austenite caused by excessive amount of retained austenite.Besides, the decrease of carbon content in retained austenite,caused by formation of cementite during extralong isothermal bainitic treatment makes stability of retained austenite reduced.
|
Received: 01 January 1900
|
|
|
|
[1] |
TIAN Ya-qiang1,BI Wen-qiang1,PAN Hong-bo2,LI Hong-bin1,ZHENG Xiao-ping1,CHEN Lian-sheng1. Effect of carbide evolution on Lüders behavior of cold rolled ART 0.1C-7Mn steel[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(6): 505-511. |
[2] |
SHAO Cheng-wei, WANG Jun-tao, ZHAO Xiao-li, HUI Wei-jun. Microstructure and mechanical properties of intercritically annealed Al-contain medium Mn steel[J]. Iron and Steel, 2020, 55(5): 87-93. |
[3] |
LI Dong-hui, XIAO Mao-guo, SUN Hao, HE Wen-chao, ZHANG Xu, LI Shao-hong. Effects of deep cryogenic treatment on microstructure and thermal stability of H13 steel[J]. Iron and Steel, 2020, 55(2): 95-102. |
[4] |
YANG Geng-wei1,HU Zhuo-li1,YIN Qi-long1,MAO Xin-ping1,2,MIAO Li-sha1,LIU Yang2. Effect of phase transformation time on microstructure and mechanical properties of hotrolled TRIP steel produced by CSP process[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(2): 143-149. |
[5] |
SU Chong-tao,GUO Xiao-jing,ZOU Hai-xia,ZHAO Guang-dong. Detection and analysis of microstructure of cold rolled dual phase steel[J]. PHYSICS EXAMINATION AND TESTING, 2020, 38(2): 17-. |
[6] |
. 本钢三连铸的单流宽板坯连铸机从达涅利公司引进,于2008年12月4日建成投产,结晶器液位控制采用NKK技术。本文介绍了7#连铸机生产过程中,结晶器液位出现不稳定性波浪的原因,并通过改进NKK液位控制工艺,微调PID控制参数,以及优化结晶器流场等措施,提高了宽幅汽车板生产时的结晶器液位控制精度,并且解决和消除了不稳定型波浪的问题,使宽幅汽车板的轧制成材率大幅提升。[J]. , 2020, 45(2): 0-0. |
|
|
|
|