An ultrahigh strength steel produced through deformation-induced ferrite transformation and Q&P process |
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| Authors: | CHEN MingMing WU RiMing LIU HePing WANG Li SHI Jie DONG Han & JIN XueJun |
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| Affiliation: | 1* 1 School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;2 School of Material Science and Engineering,North University of China,Taiyuan 030051,China;3 Baosteel Research and Development Technology Center,Shanghai 201900,China;4 National Engineering Research Center of Advanced Steel Technology(NERCAST),Central Iron and Steel Research Institute(CISRI),Beijing 100081,China |
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| Abstract: | In this work,DIFT technology and Q&P process were combined in order to introduce ultrafine-grained ferrite into the matrix of martensite and retained austenite to develop a new kind of advanced high strength steel,and two kinds of steels were investigated by this novel combined process.The newly designed process resulted in a sophisticated microstructure of a large amount of ferrite(about 5 m in diameter),martensite and a considerable amount of retained austenite for TRIP 780 steel.The ultimate tensile strength can reach about 1200 MPa with elongation above 16% for TRIP 780,that is much higher than the one solely treated by Q&P process.Tensile tests showed that both steels with the novel combined process achieved a good combination of strength and ductility,indicating that the new process is promising for the new generation of advanced high strength steels. |
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| Keywords: | deformation induced ferrite transformation(DIFT) quenching and partitioning(Q&P) microstructure mechanical property |
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