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首页> 外文期刊>Materials science forum >Effect of Rolling Process on Impact Toughness in High Strength Low Carbon Bainitic Steel
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Effect of Rolling Process on Impact Toughness in High Strength Low Carbon Bainitic Steel

机译：轧制工艺对高强度低碳贝氏体钢冲击韧性的影响

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摘要

Based on TMCP and UFC technology, the microstructures and impact toughness of low carbon bainitic steel were studied in this paper. The bainite morphology and fracture surfaces of Charpy impact specimens were observed by SEM, and mechanical properties of bainitic steel were measured by tensile and impact test. The results showed that the yield and tensile strengths of steel were 804MPa and 1015MPa, and elongation was 15.7% when the rolling was finished in the austenite recrystallization region. The steel rolled below T_(nr) temperature obtained tht yield strength of 930 MPa, tensile strength of 1090 MPa and elongation of 16.2%. However, the impact toughness was deteriorated in the steel rolled above T_(nr) temperature while the excellent impact toughness existed in the steel rolled below T_(nr) temperature. The impact toughness of steel rolled below T_(nr) temperature was 140J at -60℃, while the impact toughness of 15J at the same temperature was obtained for the steel rolled above T_(nr) temperature. The large cleavage fracture region on the fracture surface occured with the decrease of tested temperature in the steel rolled above T_(nr) temperature and inevitably reduced the impact toughness, while the main ductile fracture existed in the steel rolled below T_(nr) temperature at the same temperature. The rolling process of steel can strongly affect impact toughness of low carbon bainitic steel. Hence, the different rolling processes can adjust the occurrence of cleavage fracture and ductile fracture in order to improve the impact toughness.
机译：基于TMCP和UFC技术，研究了低碳贝氏体钢的组织和冲击韧性。用扫描电镜观察了夏比冲击试样的贝氏体形态和断裂面，并通过拉伸和冲击试验测量了贝氏体钢的力学性能。结果表明，在奥氏体再结晶区进行轧制时，钢的屈服强度和抗拉强度分别为804MPa和1015MPa，延伸率为15.7％。在T_（nr）温度以下轧制的钢的屈服强度为930 MPa，抗拉强度为1090 MPa，伸长率为16.2％。但是，在T_（nr）以上的温度下轧制的钢的冲击韧性降低，而在T_（nr）以下的温度下轧制的钢具有优异的冲击韧性。在T_（nr）温度以下轧制的钢在-60℃时的冲击韧性为140J，而在T_（nr）温度以上轧制的钢在相同温度下的冲击韧性为15J。在T_（nr）温度以上轧制的钢中，随着试验温度的降低，断裂表面出现较大的劈裂断裂区域，不可避免地降低了冲击韧性，而在T_（nr）温度以下轧制的钢中，主要的延性断裂存在。相同的温度。钢的轧制过程会严重影响低碳贝氏体钢的冲击韧性。因此，不同的轧制过程可以调节解理断裂和延性断裂的发生，以提高冲击韧性。

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  • 来源
    《Materials science forum》 |2015年第2015期|743-749|共7页
  • 作者

    Xiaolong Yang; Xiaodong Tan; Yunbo Xu; Zhiping Hu; Yongmei Yu; Di Wu;

  • 作者单位

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

    School of Mechanical Engineering, Shenyang University of chemical technology, NO.11 Street, Shenyang Economical & Technological Development Zone, Shenyang, Liaoning 110142, China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Impact toughness; High strength steel; Low carbon bainitic steel;

    机译：冲击韧性;高强度钢;低碳贝氏体钢;

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