液体He温度での軸ひずみ制御による304Lステンレス鋼の低サイクル疲労特性評価

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A cryostat has been developed for this stydy, which enables to conduct axia-strain controlled fatigue tests of SUS 304L stainless steel at 4K with the strain between 1.04 and 2.52%, the strain rate of 0.4%/sec and the strain ratio of -1. The loading in this crystat is achieved by inner and outer tubes so that the requirement for high structual rigidity to supperess the specimen bucking and that for the low cross section area to keep the heat leat as low as the liquid He consumpion rate of 1.5l/H or less are both satisfied. The fatigue tests at 300 and 77K were also conducted for comparison. On the curves showing the changes of maximum and minimum stress with the number of cycles as well as the stress-strain curve, the serration-like stress change was observed at 4K, while the smooth stress change was observed at 300 and 77K. The cyclic stress-strain curves at 4K and 77K intersected each other, showing that the stress is lower at 4K than at 77K in a small strain amplitude. Those curves at 4 and 77K lied far away above the one at 300K. The fatigue life curves or the total strain range vs. fatigue life curves at 4, 77 and 300K also interested each other, having a trend that the fatigue strength at 4K is the heighest in the high cycle range but becomes the lowest in the low cycle range. The fatigue life curves of SUS 304L obtained here at 4, 77 and 300K gave almost the same fatigue strength as that of AISI 304L obtained under the diameter-strain control condition. When compared with other austenitic stainless steels such as AISI 304, AISI 316 and AISI 310, the fatigue strength of SUS 304L was lowest at all temperatures.
社団法人日本材料学会の論文
1985-10-15

液体He温度での軸ひずみ制御による304Lステンレス鋼の低サイクル疲労特性評価

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