Abstract
Creep crack growth rate of Hastelloy XR showed a dependence on thermally activated energy at very high temperatures. The Q* parameter was then applied to estimation of the creep cracking of the material. It was found that the Q* parameter well described the initial stage of crack growth as well as the steady-state cracking. The coefficients of the Q* parameter derived here for Hastelloy XR were compared with those of SUS 304 stainless steel and Cr-Mo-V steel and each of the coefficients was explained physically by the creep ductilities.
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