A study of fatigue mesoscopic elasto-plastic properties of a nickel-base superalloy by instrumented microindentation measurements

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• 作者：Duyi Ye ; ^{duyi_ye@zju.edu.cn} ; Haibo Cha ; Lei Xiao ; Xuandong Xu
• 刊名：Journal of Nuclear Materials
• 出版年：2012
• 出版时间：January 2012
• 年：2012
• 卷：420
• 期：1-3
• 页码：525-536
• 全文大小：1620 K

文摘

In this study the fatigue mesoscopic elasto-plastic properties of nickel-base superalloy GH4145/SQ were investigated using the instrumented microindentation testing coupled with the analytic calculation. The indentation characteristic parameters of low-cycle fatigue specimens, such as the indentation curvature (C), the maximum penetration depth (h_max), the initial unloading slope (S), the residual depth of penetration (h_r), the recovered elastic work (W_e) and the residual plastic work (W_p), were determined from the experimental load-penetration depth (P-h) curves, and the fatigue mesoscopic elasto-plastic properties (E, ¦Ò_y and n) were estimated using a well-developed analysis algorithm proposed by Dao et al. The distribution patterns of the fatigue mesoscopic mechanical properties were further verified in a statistical sense. The dependence of the fatigue mesoscopic elasto-plastic properties upon the imposed strain amplitude was discussed preliminarily in terms of microstructural examinations of fatigue failure specimens.