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首页> 外文期刊>Materials Science and Engineering >Effects of carbon equivalent and cooling rate on tensile and Charpy impact properties of high-strength bainitic steels
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Effects of carbon equivalent and cooling rate on tensile and Charpy impact properties of high-strength bainitic steels

机译：碳当量和冷却速率对高强度贝氏体钢拉伸和夏比冲击性能的影响

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摘要

The effects of carbon equivalent and cooling rateon tensile and Charpy impact properties of high-strength bainitic steels were investigated. Eight steel plates were fabricated with varying C, Cr, and Nb additions under two different cooling rates, and their microstructures, tensile, and Charpy impact properties were evaluated. Volume fractions of microstructural components present in the steels increased in the order of granular bainite, acicular ferrite, bainitic ferrite, and martensite as the carbon equivalent or cooling rate increased, which resulted in decreased ductility and upper shelf energy and increased energy transition temperature in spite of increased strength. In the steels containing about 50vol.% of bainitic ferrite and martensite, the tensile strength was about 900 MPa, while the elongation and upper shelf energy were about 20% and 200 J, respectively. In order to achieve the best combination of tensile strength, ductility, and upper shelf energy, e.g., 860-900 MPa, 20%, and 200J, respectively, granular bainite, and acicular ferrite were produced by controlling the carbon equivalent and cooling rate, while about 50vol.% of bainitic ferrite and martensite were maintained to keep the high strength.
机译：研究了碳当量和冷却速率对高强度贝氏体钢拉伸和夏比冲击性能的影响。在两种不同的冷却速率下制造了八种具有不同C，Cr和Nb添加量的钢板，并评估了它们的显微组织，拉伸性能和夏比冲击性能。随着碳当量或冷却速率的增加，钢中存在的显微组织成分的体积分数按粒状贝氏体，针状铁素体，贝氏体铁素体和马氏体的顺序增加，这导致尽管延展性和上架能量降低，但尽管能量转变温度升高强度增加。在含有约50vol。％贝氏体铁素体和马氏体的钢中，抗拉强度为约900MPa，而延伸率和上架能分别为约20J和200J。为了获得抗张强度，延展性和上架能量（例如分别为860-900 MPa，20％和200J）的最佳组合，通过控制碳当量和冷却速率来生产粒状贝氏体和针状铁素体，同时保持约50vol。％的贝氏体铁素体和马氏体以保持高强度。

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  • 来源
    《Materials Science and Engineering》 |2011年第2011期|p.530-538|共9页
  • 作者

    Hyo Kyung Sung; Sang Yong Shin; Byoungchul Hwang; Chang Gil Lee; NackJ. Kim; Sunghak Lee;

  • 作者单位

    Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, South Korea;

    Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, South Korea;

    Ferrous Alloys Croup, Korea Institute of Materials Science, Changwon, 641-831, South Korea;

    Ferrous Alloys Croup, Korea Institute of Materials Science, Changwon, 641-831, South Korea;

    Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, South Korea;

    Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    high-strength bainitic steel; carbon equivalent; cooling rate;

    机译：高强度贝氏体钢碳当量冷却速率;

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