Linear and Nonlinear Ultrasonic Properties of Fatigued 410Cb Stainless Steel
Linear and Nonlinear Ultrasonic Properties of Fatigued 410Cb Stainless Steel
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疲劳 410Cb 不锈钢的线性和非线性超声性能
DOI：
10.1007/978-1-4613-0383-1_176
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
W. Yost
中科院分区：
文献类型：
--
作者：
J. Na;J. Cantrell;W. Yost
裂纹前疲劳状态的评估是涡轮叶片无损评估中的一个重要问题。电力行业特别关注的是蒸汽驱动的不锈钢叶片在疲劳裂纹形核之前的使用寿命后期阶段的疲劳状态。本文报道了弗吉尼亚电力公司提供的410Cb不锈钢试件的声衰减、纵向速度和非线性参数的测量结果。对原始试件和退役涡轮叶片试件进行了研究。从原始材料出发，根据ASTM标准制备了一系列样品，并在材料屈服强度的85%的拉应力水平下进行了0至1000万次循环疲劳，R值为零。将测量结果与退役涡轮叶片材料的测量结果进行了比较。
The assessment of pre-crack fatigue conditions is a problem of some importance in the nondestructive evaluation of turbine blades. Of particular concern to the electric power industry is the state of fatigue of steam driven stainless steel blades during the latter stages of service life prior to the nucleation of fatigue cracks. We report here measurements of acoustic attenuation, longitudinal velocity, and nonlinearity parameters on 410Cb stainless steel specimens provided by Virginia Power Company. Both virgin specimens and specimens from retired turbine blades were studied. From the virgin material a series of samples were prepared according to ASTM standards and cyclically fatigued from 0 to 10 million cycles at a tensile stress level of 85% of the yield strength of the material with an R value of zero. The results of the measurements are compared to that obtained from the retired turbine blade material.