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Influence of Nitrogen on the Notch Sensitivity of 316LN Stainless Steel During Tensile Deformation

机译：氮对316LN不锈钢拉伸变形时缺口敏感性的影响

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摘要

316L(N) stainless steel (SS) containing 0.07 mass% nitrogen is used as a major structural material for sodium cooled fast reactor components that are designed to operate at elevated temperatures with a design life of 40 years. With a view to increase the component design life to 60 years, studies are being carried out to develop a high nitrogen grade of 316L(N) SS designated as 316LN SS with superior high temperature tensile, creep and low cycle fatigue properties. Extensive studies on the mechanical properties, corrosion resistance and weldability are underway on 316LN SS containing nitrogen in the range of 0.07 to 0.22 mass%. In this investigation, influence of nitrogen on the notch sensitivity of 316LN SS during tensile deformation has been studied. The notched specimens contained a 60° V-notch with a root radius of 0.1 mm and an effective gauge diameter of 2.8 mm. Tensile tests were conducted at room temperature and at 823 K on four different heats containing 0.07, 0.11, 0.14 and 0.22 mass% nitrogen using both smooth and notched specimens, at a strain rate of 3 × 10~(-3) s~(-1). Finite element analysis was performed to evaluate the values of triaxial stresses and strain developed in the notch region. The yield strength and ultimate tensile strength of 316LN SS were found to increase with the inclusion of notch for all the heats and at both the test temperatures. The ductility of notched specimens was found to be lower than that of the smooth specimens in all the cases. It was observed that the amount of nitrogen content had a significant effect on the tensile strength and ductility of 316LN SS.
机译：含0.07质量％氮的316L（N）不锈钢（SS）被用作钠冷却快堆组件的主要结构材料，这些组件设计用于在高温下工作，设计寿命为40年。为了将组件设计寿命延长至60年，正在进行研究以开发具有优异的高温拉伸，蠕变和低循环疲劳性能的316LN SS的高氮等级。对含氮量为0.07至0.22质量％的316LN SS的机械性能，耐腐蚀性和可焊性进行了广泛的研究。在这项研究中，研究了氮对316LN SS拉伸变形过程中缺口敏感性的影响。带缺口的样品包含一个60°V形缺口，其根半径为0.1毫米，有效标称直径为2.8毫米。使用光滑和有缺口的试样在室温和823 K下对四个含0.07、0.11、0.14和0.22质量％氮的不同热进行拉伸试验，应变率为3×10〜（-3）s〜（- 1）。进行了有限元分析，以评估在缺口区域中产生的三轴应力和应变的值。发现在所有温度下以及在两个测试温度下，都加入了缺口，从而提高了316LN SS的屈服强度和极限抗拉强度。发现在所有情况下，缺口试样的延展性均低于光滑试样的延展性。观察到氮含量对316LN SS的拉伸强度和延展性有显着影响。

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  • 来源
    《High temperature materials and processes》 |2011年第5期|p.511-517|共7页
  • 作者

    M. Nandagopal; V. Ganesan; J. Ganesh Kumar; K. Laha; M. D. Mathew;

  • 作者单位

    Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India;

    Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India;

    Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India;

    Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India;

    Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, Tamilnadu, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    notch strengthening; notch root; stress con- centration factor; von mises stress; axial stress; FEM anal- ysis;

    机译：缺口加强;缺口根应力集中系数;冯·米塞斯轴向应力有限元分析;

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