MICROSTRUCTURE CONTROL OF HOT ROLLED TRIP STEEL BASED ON DYNAMIC TRANSFORMATION OF UNDERCOOLED AUSTENITE
II. Cooling Rate After Dynamic Transformation of Undercooled Austenite

doi:10.3724/SP.J.1037.2009.00432

Acta Metall Sin

2010, Vol. 46

Issue (2): 161-166 DOI: 10.3724/SP.J.1037.2009.00432

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MICROSTRUCTURE CONTROL OF HOT ROLLED TRIP STEEL BASED ON DYNAMIC TRANSFORMATION OF UNDERCOOLED AUSTENITE
II. Cooling Rate After Dynamic Transformation of Undercooled Austenite

YIN Yunyang ^1;3; YANG Wangyue ¹; LI Longfei ²; SUN Zuqing ²; WANG Xitao ²

1. School of Materials Science and Engineering; University of Science & Technology Beijing; Beijing 100083
2. State Key Laboratory for Advanced Metals and Materials; University of Science & Technology Beijing; Beijing 100083
3. Research and Development Center; Wuhan Iron and Steel (Group) Corp.; Wuhan 430080

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YIN Yunyang YANG Wangyue LI Longfei SUN Zuqing WANG Xitao . MICROSTRUCTURE CONTROL OF HOT ROLLED TRIP STEEL BASED ON DYNAMIC TRANSFORMATION OF UNDERCOOLED AUSTENITE
II. Cooling Rate After Dynamic Transformation of Undercooled Austenite. Acta Metall Sin, 2010, 46(2): 161-166.

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Abstract

TRIP–aided steels are ideal for lightweight automotive applications due to their high strength and ductility. Thermomechanical processing simulations were performed by hot compression on a Gleeble–1500 machine, in order to develop a comprehensive understanding of the effect of cooling rate after dynamic transformation of undercooled austenite (DTUA) on the microstructure evolution and mechanical properties of 0.2C–1.5Mn–0.5Si–1.0Al (mass faction, %) transformation–induced plasticity (TRIP) steel. The results show that the metastable austenite would be transformed to ferrite mainly by means of nucleation during cooling after DTUA. Decreasing the cooling rate after DTUA, the vlume fraction of ferrite increase, the static recovery of dislocations in ferrite produced during dynamic transformation could fully take place, thus the density of dislocations in ferrite decreased through by rearranging and merging, but the grain size of ferrite changes little. At the cooling rate of 30℃/s, the investigated steel has a moderate volume fraction of ferrite and dislocation density in ferrite and a higher volume fraction of retained austenite, resulting in the steel having a higher strength and plasticity.

Key words: hot rolled TRIP steel dynamic transformation of undercooled austenite (DTUA) cooling rate microstructure mechanical property

Received: 29 June 2009

Fund:

Supported by National High Technology Research and Development Program of China (No.2007AA03Z501) and Specialized Research Fund for the Doctoral Program of Higher Education (No.200800081014)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00432 OR https://www.ams.org.cn/EN/Y2010/V46/I2/161

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