Abstract
High temperature low-cycle fatigue tests were conducted by using a miniature specimen with diameter of 2mm and gage length of 3mm in order to investigate a detailed distribution of low-cycle fatigue properties in a welded joint of 316FR stainless steel. First, a high temperature low cycle fatigue testing procedure by miniature specimens was established. Five kinds of specimen were taken from the 316FR stainless steel welded joint of 50mm thick plate; one from the base metal, two from the heat affected zone with different hardness, and two from the weld metal in longitudinal and tangential directions. Low-cycle fatigue tests were carried out at 550°C at the strain rate of 0.1%/sec in air. Detailed low-cycle fatigue properties, such as fatigue strength, cyclic hardening/softening behavior and cyclic stressstrain curve, of the 316FR stainless steel welded joint were clarified.
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