On structure-property relationship in nanostructured bainitic steel subjected to the quenching and partitioning process

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:661

Article

Luo, Ping¹  Gao, Guhui¹  Zhang, Han²  Tan, Zhunli¹  Misra, R. D. K.³  Bai, Bingzhe^1,4 

[1] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Mat Sci & Engn Res Ctr, Beijing 100044, Peoples R China

[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[3] Univ Texas El Paso, Dept Met Mat & Biomed Engn, Lab Excellence Adv Steel Res, El Paso, TX 79968 USA

[4] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Beijing 100084, Peoples R China

关键词: Bainitic steel;    Q&P process;    Retained austenite;    Mechanical property;   

DOI  :  10.1016/j.msea.2016.03.006

来源: Elsevier

【 摘 要 】

We elucidate here the mechanistic contribution of the application of quenching and partitioning (Q&P) concept to a high carbon Mn-Si-Cr steel in obtaining a multiphase microstructure comprising of martensite/austenite and nanostructured bainite (bainitic ferrite and nanometer-sized film-like retained austenite) that exhibited tensile strength of 1923 MPa and total elongation of 18.3%. The excellent mechanical properties are attributed to the enhanced refinement of blocky austenite islands obtained by the Q&P process. The austenite was stabilized by both carbon partitioning from martensite and bainite transformation. Compared with conventional heat treatment to produce nanostructured bainite, the total time is significantly reduced without degradation of mechanical properties. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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