Fatigue Crack Growth Rate in Welded Joints after Stress Relief Heat Treatment

概要

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The effect of stress relief heat treatment on fatigue crack growth rate was studied experimentally. Fatigue tests and residual stress measurements were carried out on three types of specimen ; base metal specimen, as-welded specimen and stress relieved specimen. All tests were carried out on center-notched specimen with the identical geometry and size, made from a 80kg/mm^2 tensile strength steel plate. From experimental results, it was cleared that the fatigue crack growth rate of as-welded specimen was faster than that of base metal specimen. The fatigue crack growth rate of stress relieved specimen, whose tensile residual stress is 5kg/mm^2, was as same as that of as-welded specimen up to the region of ΔK=70kg/mm^<312>. So, the stress relief heat treatment seems to be of little effect on fatigue crack growth rate, if it can't cancel residual stress perfectly.
大阪大学の論文