極低温くり返し応力下での金属材料の温度上昇と変形挙動

抄録

Measurements and discussions were made on the temperature rise of specimen during fatigue tests at 4K. In SUS310S stainless steels and tension-tension (R=0.01) tests, temperature rise was negligible under the stress of the proof stress even at 10 Hz. In tension-compression (R=-1) tests, however, a hundred times of the temperature rise occurred compared with those at R=0.01. In SUS304L steel, which has low proof stress but the work hardening accompanied by the stress-induced martensitic transformation occurs in low temperatures, the temperature rise was rather small compared with SUS310S steels. The difference in the magnitude of the temperature rise especially between at R=0.01 and at R=-1 depended on the magnitude of the plastic deformation. The upper limit of the fatigue frequency (temperature rise<1K) was, which also varied with the applied stress and materials, 5Hz at R=0.01 and 0.1 Hz at R=-1.