Abstract
Abstract A series of corrosion and strain controlled low-cycle fatigue tests were conducted in simulated HTGR helium on two heats of Ni–Cr–W superalloy, i.e., SSS113M and its modified version containing Mn and Si. The materials were tested in the conventional solid solution treated condition as well as in the double heat treated one, which aimed at the precipitation of the α2-W phase along the grain boundaries. In those tests the possibility of improving the corrosion and high temperature fatigue resistance of Ni-Cr-W superalloys was studied. The addition of Mn and Si, and the reduction in Ti improved the oxidation resistance of SSS113M in HTGR helium. The double heat treatment was effective in improving the intergranular fracture resistance to some degree. But the degree of improvement was inadequate for the modified version containing Mn and Si.
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