溶接継手部材のSCC感受性評価における残留応力

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  • Residual Stresses in the Evaluation of the SCC Susceptibility of Welded Joint
  • ヨウセツ ツギテ ブザイ ノ SCC カンジュセイ ヒョウカ ニ オケル ザン

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Role of residual stresses in the evaluation of SCC susceptibility of welded joints was studied on the butt-welded stainless steel specimens. Distribution of residual stresses was measured by both nondestructive X-ray method and modified Kelsey's method which was newly proposed for the determination of residual stresses within the specimens. Comparison of data accuracy and measuring facilities in both methods was made and resulted that modified Kelsey's method was an available one. Threshold residual tensile stress which causes SCC without applied stresses was found to be 11kg/mm2 in the combination of austenitic stainless steel SUS 304-42% boiling magnesium chloride solution. However, in some cases, cracks initiated at the place with surface residual stresses lower than the threshold residual stress, therefore materials properties, such as pre-strain (defect concentration), surface roughness and residual stresses within the specimen also should be taken into account as well as the surface residual stresses. For the evaluation of SCC susceptibility in the test case where applied stresses were imposed on the specimens with residual stresses. Resultant stress composed of applied and residual stress at crack initiation was proposed and found to be an effective parameter in most cases of all specimens tested. But this parameter also becomes improper one for the estimation of SCC susceptibility, especially in the case of specimens which have both hardened surface and therefore higher residual stresses than the original yield strength. Shot peened and ground specimens are this case. The reason for this inconvenience and other troubling cases in using resultant stress are discussed based on the materials properties of specimens.

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