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Small punch and uniaxial creep fracture behaviours of modified SUS304H steel at various temperatures

机译：各种温度修改SU304H钢的小拳和单轴蠕变断裂行为

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Commercial austenitic stainless steel SUS304H with small amount of vanadium addition was used in this study. Small punch (SP) creep and uniaxial tensile creep tests were conducted at 650, 700, and 750 degrees C to measure creep lives and the minimum displacement rates or the minimum creep strain rates. The measured parameters were compared between the two test methods, seeking empirical relationships among the parameters using Larson-Miller Parameter and Monkman-Grant relation. Magnitude of the applied stress (MPa) in the uniaxial tensile creep test was approximately equal to the applied load value (N) in the SP creep test at all test temperatures. It was shown that during the creep deformation of the SP creep specimen, crack initiation and accompanying crack growth occur simultaneously. Competing failure mechanisms of creep deformation and crack growth may affect the SP creep life and consequently determine the proportionality function, a, in the relation between the SP load and the tensile creep rupture stress in creep tests.
机译：在本研究中使用了具有少量钒添加量的商业奥氏体不锈钢SUS304H。小冲孔（SP）蠕变和单轴拉伸蠕变试验在650,700和750℃下进行，以测量蠕变寿命和最小位移率或最小蠕变应变速率。在两个测试方法之间比较测量的参数，使用Larson-Miller参数和Monkman-Grant关系寻求参数之间的经验关系。在所有测试温度下，单轴拉伸蠕变试验中的施加应力（MPa）的幅度大致等于SP蠕变试验中的施加的载荷值（n）。结果表明，在SP蠕变样本的蠕变变形期间，同时发生裂纹引发和伴随裂纹生长。蠕变变形和裂纹增长的竞争失效机制可能影响SP蠕变寿命，因此确定了SP负载与蠕变试验中的拉伸蠕变破裂应力之间的关系A的比例函数A.

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