316ステンレス鋼のクリープ変形に対する先行繰返し塑性変形の影響

概要

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Multiaxialhistory effects of cyclic plasticity on creep were studied experimentally for type 316 stainless steel at an elevated temperature. Firstly, after a cyclic stabilization of prior cyclic tension-compression of constant total strain amplitude, constant stress creep tests were conducted under simple tension, simple torsion, and combined tension-torsion (√<3>τ/σ = 0, oo, 1). Three levels of creep stress were chosen which corresponded to the saturated cyclic stress amplitude and to certain values larger or smaller than that. Secondly, in order to elucidate the path shape effect of the prior strain cycle, a non-proportional strain cycle along a circular path was followed by a constant stress creep in tension where the strain amplitude was specified so as to result in the same saturated stress amplitude as in the tension-compression cycle compared. It was observed that the prior tension-compression cycle induced an anisotropic hardening for creep ; creep resistance was enhanced in the torsional direction, while somewhat decreased in the tensile direction. This is similar to the cross hardening effect reported in experiments on non-proportional cyclic strain hardening. The circular cycle, as expected, showed a much more significant hardening effect on creep.
一般社団法人日本機械学会の論文
1990-01-25