Abstract
In this study, low cycle fatigue tests were conducted for low ally steel, SFVQ1A, austenitic stainless steel, SUS316NG, and carbon steel, STS410, in order to investigate internal fatigue crack growth characteristics. The tests were conducted under repeated two-step variable amplitude strain condition to appear beach marks of cracks on the fracture surface. In addition to these tests, tests with surface removal were also conducted to suppress surface fatigue cracks by polishing the specimen surface during the fatigue tests. Cracks initiated from internal inclusion and those fatigue life were slightly larger under surface removal test for SFVQ1A and SUS316NG compared to those under no surface removal tests. STS410 specimen under surface removal test was not broken until its specimen diameter became too small. There was an internal crack observed on the section of the specimen cut longitudinally. Internal crack growth rate calculated from beach marks for SFVQ1A and SUS316NG was similar to that of surface cracks.
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