Effect of tempering temperature on the mechanical properties and microstructure of an copper-bearing low carbon bainitic steel

Aimin Guo, Xinli Song, Jinquan Tang, Zexi Yuan

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    Aimin Guo, Xinli Song, Jinquan Tang, and Zexi Yuan, Effect of tempering temperature on the mechanical properties and microstructure of an copper-bearing low carbon bainitic steel, J. Univ. Sci. Technol. Beijing , 15(2008), No. 1, pp.38-42. https://dx.doi.org/10.1016/S1005-8850(08)60008-0
    Aimin Guo, Xinli Song, Jinquan Tang, and Zexi Yuan, Effect of tempering temperature on the mechanical properties and microstructure of an copper-bearing low carbon bainitic steel, J. Univ. Sci. Technol. Beijing , 15(2008), No. 1, pp.38-42. https://dx.doi.org/10.1016/S1005-8850(08)60008-0
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    Effect of tempering temperature on the mechanical properties and microstructure of an copper-bearing low carbon bainitic steel

    • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

    • Hubei Province Key Laboratory of Ceramics and Refractories, Wuhan University of Science and Technology, Wuhan 430081, China

      通信作者:

      Aimin Guo E-mail: gamy007@sina.com.cn

    中文摘要

    The effect of tempering temperature on the microstructure and mechanical properties of ultra-high strength, copperbearing, low-carbon bainitic steel has been investigated in the experiment. The results showed that the microstructure was mainly the laths of bainite in the as-quenched steel. The bainitic laths were restored and combined after the steel tempered at various temperatures. There were rnartensite/austenite (M/A) islands and numerous dislocations within and between the bainitic laths, while very t-me precipitates of ε-Cu were also observed within the laths. With increasing the tempered temperature from 400 to 600℃, the yield strength (YS) increased from 877 to 957 MPa, whereas the ultimate tensile strength (UTS) decreased from 1020 to 985 MPa. The Charpy V-notch (CVN) varied from 68.5 to 42 J, and the value was minimal for the steel tempered at 500℃.

     

    Materials

    Effect of tempering temperature on the mechanical properties and microstructure of an copper-bearing low carbon bainitic steel

    Author Affilications

      • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

      • Hubei Province Key Laboratory of Ceramics and Refractories, Wuhan University of Science and Technology, Wuhan 430081, China

    • Received: 23 January 2007;
    The effect of tempering temperature on the microstructure and mechanical properties of ultra-high strength, copperbearing, low-carbon bainitic steel has been investigated in the experiment. The results showed that the microstructure was mainly the laths of bainite in the as-quenched steel. The bainitic laths were restored and combined after the steel tempered at various temperatures. There were rnartensite/austenite (M/A) islands and numerous dislocations within and between the bainitic laths, while very t-me precipitates of ε-Cu were also observed within the laths. With increasing the tempered temperature from 400 to 600℃, the yield strength (YS) increased from 877 to 957 MPa, whereas the ultimate tensile strength (UTS) decreased from 1020 to 985 MPa. The Charpy V-notch (CVN) varied from 68.5 to 42 J, and the value was minimal for the steel tempered at 500℃.

     

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