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EFFECTS OF NOVEL Q-P-T AND TRADITIONAL Q-T PROCESSES ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF MARTENSITIC STEELS WITH DIFFERENT CARBON CONTENT |
ZHANG Ke1), XU Weizong1), GUO Zhenghong1), RONG Yonghua1), WANG Maoqiu2), DONG Han2) |
1) School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240
2) National Engineering Research Center of Advanced Steel Technology, Central Iron-Steel Research Institute, Beijing 100081 |
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Cite this article:
ZHANG Ke XU Weizong GUO Zhenghong RONG Yonghua WANG Maoqiu DONG Han. EFFECTS OF NOVEL Q-P-T AND TRADITIONAL Q-T PROCESSES ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF MARTENSITIC STEELS WITH DIFFERENT CARBON CONTENT. Acta Metall Sin, 2011, 47(4): 489-496.
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Abstract Compared with traditional quenching and tempering (Q-T) treatment, the product of strength and elongation of the carbon steel can be enhanced significantly by novel quenching-partitioning-tempering (Q-P-T) treatment, especially for the medium carbon steel. Based on the tensile results, the product of strength and elongation of the Fe-0.42C-1.46Mn-1.58Si-0.028Nb specimen treated by Q-P-T, is up to 31627 MPa?% with elongation 20.3\%, which not only is higher than the specimen treated by Q-T process, but also meets the mechanical properties predicted of next generation advanced high strength steel. Microstructural analysis indicates the differences in Q-T and Q-P-T process lie on the amount of retained austenite and its size distribution as well as the size range of lath martensite. The former results in the low amount (<3%) of thin film-like austenite in addition to nonuniform martensite size, while the later results in the high amount of thick flake-like austenite accompanying uniform martensite size. Therefore, the higher barrier for micro-crack propagation and the better plastic deformation ability of advanced high strength steel (AHSS) can be obtained by Q-P-T treatment.
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Received: 14 October 2010
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Fund: Supported by National Natural Science Foundation of China (No.51031001) |
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