異種金属電子ビーム溶接継手のクリープ・疲労強度とその推定

概要

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Creep-fatigue tests of dissimilar metal electron beam welded joint between A387 Gr. 22 steel and SUS316 steel (A387-SUS316) were carried out under strain-controlled cycling over the welded joint at a temperature of 873 K in air. The creep-fatigue life of A387-SUS316 was shorter than those of base metals. In order to discuss the creep-fatigue fracture behavior of A387-SUS316, the change of strain distribution with strain cycling was investigated by using the specimen on which heat-resisting Moire grid was inscribed. A higher strain was produced on SUS316 side at the early stage of fatigue life, and the strain concetration occurred on A387 side during the subsequent strain cycling. It was also found that the hardness distribution was one of the most important measures on which the strain distribution was reflected. Furthermore, a new prediction method for creep-fatigue life of dissimilar metal welded predicted creep-fatigue life approximately agreed with the experimental results.
社団法人日本材料学会の論文
1989-02-15