Steady state behaviour of alloy 800H under cyclic deformation

Abstract

In this communication the authors report on the results of an investigation of steady state mechanical response of Alloy 800H to cyclic tension-compression. The investigation covered the temperature range of 973 K to 1,228 K, which included the temperatures of interest for most current and potential applications of the alloy. Phenomenological relations between the pertinent mechanical quantities were established. The observed regularities of cyclic deformation, condensed in a simple mathematical expression given below, may provide a convenient tool for users of the alloy--the more so as the literature data on cyclic deformation behavior of the alloy available so far are scarce. The tension-compression results are complemented with those on steady state deformation in monotonic tensile tests. The composition of the batch of Alloy 800H studied is as follows (in wt.%): 32.7 Ni, 21.1 Cr, 0.39 Si, 0.95 Mn, 0.38 Ti, 0.42 Al, 0.006 S, 0.34 Cu, Fe balance. The carbon content (0.08 wt.%) is bound in Ti and Cr carbides.