SUS316 の高温低サイクル疲労過程中の微視的組織変化

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The substructural change during low-cycle fatigue of SUS316 stainless steel at elevated temperature has been investigated by X-ray diffraction and transmission electron microscopy, and its correlation with the fatigue hardening behavior has also been shown. Fatigue test was performed under a total strain range of 1.0% with a strain rate of 4×10^<-4> sec^<-1> at 600, 700 and 800℃. The main results obtained are as follows : (1) The saturation hardening stage attained after around 100 cycles at 600℃, 12 cycles at 700℃ and a few cycles at 800℃. (2) At 600℃, the particle size (<D>_e) decreased markedly with increasing cycles up to 10 cycles and varied little afterwards. At 700℃, <D>_e decreased in the hardening stage, became constant in the earlier stage of the saturation hardening stage but increased at the later stage. At 800℃, <D>_e became 30000∿40000 Å at the earlier cycle and varied little afterwards. (3) At the saturation hardening stage, <D>_e changed little but microstrains varied markedly within one cycle. Storage, relief, storage and relief of strain energy are repeated in one stable hysteresis loop. As a result, it seems that there is little net' change in stored energy within one cycle. (4) It seems that the stress range (⊿σ) at the hardening stage depends on the dislocation density (ρ) and the relation between them is given by ⊿σ/2bG=1.05×10^5+0.96√<ρ> where G is the shear modulus.
社団法人日本鉄鋼協会の論文
1982-05-01

SUS316 の高温低サイクル疲労過程中の微視的組織変化

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