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

作者：Ye Duyi^*; Cha Haibo; Xiao Lei; Xu Xuandong

来源：Journal of Nuclear Materials, 2012, 420(1-3): 525-536.

DOI：10.1016/j.jnucmat.2011.10.050

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, sigma(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.

• 出版日期2012-1
• 单位浙江大学