Acta Metall Sin  2011, Vol. 47 Issue (4): 489-496    DOI: 10.3724/SP.J.1037.2010.00547

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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

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.

Abstract References Related Articles Recommended Metrics Download:  PDF(1492KB)  Export:  BibTeX | EndNote (RIS)       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. Key words:  Q-P-T process      advanced high strength steel      retained austenite      product of strength and elongation      Received:  14 October 2010      ZTFLH:  TG142   Fund:  Supported by National Natural Science Foundation of China (No.51031001) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors ZHANG Ke URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00547     OR     https://www.ams.org.cn/EN/Y2011/V47/I4/489 [1] Sakuma Y. In: Baker M A ed., Proc Int Conf on Advanced High Strength Sheet Steels for Automotive Applications. 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