Abstract
This paper describes the high temperature low cycle fatigue life of high nickel steel (HNIS)-SUH35 friction welded specimens. High temperature low cycle fatigue tests were carried out on HNIS, SUH35 base metal specimens and HNIS-SUH35 friction welded specimens. HINS base metal specimens had superior fatigue strength in comparison with SUH35 specimens. The fatigue life of the welded specimens was equivalent to that of SUH35 specimens. The fracture point of the welded specimens was at SUH35 steel, 2 [approx] 3 mm apart from the weld interface. The fatigue life of the welded specimens was estimated from the strain concentration calculated in the finite element analysis. The fracture point of the welded specimen was well explained by the Mises' equivalent strain concentration at SUH35 steel. The low cycle fatigue life of a welded specimen was predicted from the total strain range obtained in the finite element analysis. The predicted low cycle fatigue life was three times smaller than that in the experiments. The difference between the predicted and experimental fatigue lives was attributed to the compressive mean stress occurring in SUH35 steel. The life prediction using the parameter which took account of the tensile stress amplitude successfully predicted the low cycle fatigue life of the welded specimen. (author).
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