321型および347型ステンレス鋼溶接部の高温強度

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The present study was carried out to clarify the high temperature properties of stainless steel welded joints of AISI types 347 and 321 in as-welded condition, and the effect of post-heating on the creep rupture properties of these joints. To prepare test pieces, stainless steel plates of types 347 and 321 with 25 mm thick were welded using 16 Cr-8 Ni-2 Mo and 19 Cr-8 Ni-1 Mo electrode. Some of these welded joints were given post-heating at 1050℃ for 1 hr and at 900℃ for 2 hrs. In the tension test, specimens as-welded fractured at base metal, and their tensile strength was equal to that of base metal. Tensile strength of specimen post-heated was slightly lower than when it was left as-weld. (Fig. 4, 5) Type 321 stainless steel welded joint using 16-8-2 electrode had the best fatigue properties among the joints in as-welded condition. (Table 2) In creep rupture test, type 347 stainless steel welded joint as-welded fractured at the heat-affected zone of base metal and its rupture strength was very poor. However type 347 stainless steel welded, joint recovered considerable rupture strength by post-heating at 900℃ and 1050℃. (Table 4) It seems that this decay of the heat-affected zone is caused by the strain, near the weld groove. By post-heating at 1050℃, coarsening of grain and softening occurred at the heat-affected zone. (Fig. 3, Photo. 1, 2) It seems that this zone has been slightly hot-cold worked during weld by thermal stress caused from temperature gradient and contraction of weld metal. On the other hand, type 321 stainless steel welded joint in the rupture test. 1050℃ post-heating make its weld boundary so weak, that the creep specimen ruptured at the boundary along the bond. But, 900℃ post-heating didn't produce such a decay. (Table 4, Photo. 4, 5) It is not clear why such a decay occur in type 321 stainless steel welded joint.
社団法人日本材料学会の論文
1961-03-15

321型および347型ステンレス鋼溶接部の高温強度

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