SUS304の高温における一方向引張とクリープ疲労の微小き裂発生・成長挙動の相違

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It is well known thatslow-fast or tension-hold strain waveforms, which are so-caled c-p type waveforms, yield the shortest life of high-temperature low-cycle fatigue for 304 stainless steel. This maybe attributed to an irreversible creep deformation such as an accumulation of grain boundary sliding in the tension going direction which results from the difference in strain rate between in tension and in compression in every cycle. This characterisic seems to be a fundamental nature of creep-fatigue being typical to many kinds of heat resistant steels. From this point of view, a monotonic tensile test was conducted under a constant strain rate being equal to the tension going strain rate of slow-fast waveform for a fatigue test using a 304 stainless steel smooth specimen, and the difference between monotonic tension and fatigue in the behavior of small crack initiation and early growth along grain boundaries on the surface of the specimen was examined. The crack initiation life was shorter and the crack density was higherin monotonic tension than in fatigue. All the small cracks were arrested with the blunting of the tuips in onotonic tension, although some of the cracks propagated discretely to become large cracks in fatigue. It can gbe concluded that the easy crack initiation and the following crack coalescence due to local necking of the specimen in monotonic tension causes the shorter failure life as compared with the fatigue life.
社団法人日本材料学会の論文
1989-09-15

SUS304の高温における一方向引張とクリープ疲労の微小き裂発生・成長挙動の相違

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