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Effect of trace ferrite on mechanical properties of a tempered HSLA steel

机译：微量铁素体对回火HSLA钢力学性能的影响

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摘要

The influence of trace ferrite on tensile and impact properties of a HSLA steel quenched from 850 degrees C and tempered at different temperatures has been examined. SEM and TEM analyses show that the quenched microstructure is martensite with similar to 3 vol% ferrite, and the evolution of martensite at different tempering conditions is same to that of specimens with single martensite. The tensile strength is determined by the strength of ferrite and martensite according to the law of mixtures. The yield strength is a result of precipitation strengthening and tempering softening, and the yielding point appears when the mobile dislocations are insufficient. Both yield and tensile strength are reduced by the trace ferrite when tempering at temperatures 180-350 degrees C due to the strength difference between ferrite and martensite. Moreover, the ferrite improves the elongation but deteriorates the impact property for its low strength, and the tempered martensite embrittlement is advanced to lower tempering temperature 250 degrees C due to the carbide precipitation facilitated by the trace ferrite. However, the influence of trace ferrite is reduced after tempering at higher temperatures 450 degrees C and 550 degrees C. High temperature tempering is essential for specimens with trace ferrite to achieve optimal comprehensive mechanical properties.
机译：研究了痕量铁素体对从850℃淬火并在不同温度回火的HSLA钢的拉伸和冲击性能的影响。 SEM和TEM分析表明，淬火后的组织为马氏体，铁素体含量接近3％，在不同回火条件下，马氏体的组织演变与单马氏体试样相同。抗拉强度由铁素体和马氏体的强度根据混合物定律确定。屈服强度是析出强化和回火软化的结果，当移动位错不足时出现屈服点。由于铁素体与马氏体之间的强度差，在180-350摄氏度的温度下回火时，微量铁素体会降低屈服强度和拉伸强度。此外，铁素体由于其低强度而提高了伸长率，但使冲击性能劣化，并且由于痕量铁素体促进的碳化物析出，将回火马氏体脆化提高至较低的回火温度250℃。但是，在较高的450°C和550°C的温度下回火后，痕量铁素体的影响会降低。高温回火对于具有痕量铁素体的样品达到最佳的综合机械性能至关重要。

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  • 来源
    《Materials Science and Engineering》 |2019年第28期|299-304|共6页
  • 作者

    Wang Shaoyang; Yu Hao; Gu Hairong; Zhou Tao; Wang Lu;

  • 作者单位

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, 30 Xueyuan Rd, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, 30 Xueyuan Rd, Beijing 100083, Peoples R China;

    Maanshan Iron & Steel Co Ltd, 8 Jiuhuaxi Rd, Maanshan City 243000, Anhui, Peoples R China;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, 30 Xueyuan Rd, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, Natl Ctr Mat Serv Safety, 30 Xueyuan Rd, Beijing 100083, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Trace ferrite; Quenching temperature; Tempering temperature; Elongation; Tensile strength; Impact;

    机译：痕量铁素体;淬火温度;回火温度;延伸率;拉伸强度;冲击;

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