HT 80 溶接部の応力除去試験 : 応力除去焼鈍に関する研究(第 8 報)

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概要

• 論文の詳細を見る

• Welded part plays an important role in stress relieving heat treatment, because it shows structural changes during S. R. treatment and enhances the decrease in residual stress. In order to make clear the role of welded part in S. R. treatment, stress relaxation test on deposited metal, stress relieving tests of welded joint and H-type restraint specimens were carried out. Deposited metal shows greater reduction in stress than base metal. In addition, an abrupt drop in stress at 250℃ and thereafter is observed in the heating stage. This phenomenon could be ascribed to the lowering of creep resistance owing to internal strain field induced by decomposition of retained austenite. Stress reduction in HL specimen is smaller than that in welded joint specimen. The main reason for this discrepancy is considered to be the difference in restraint condition between two specimens, because the stress reduction rate is found, both theoretically and experimentally, to be dependent upon the restraint condition of specimen, and HL specimen has a restraint condition in which stress reduction rate is minimum. In comparison with the results on base metal, welded part indicates a markedly greater reduction in residual stress, especially in the lower temperature region. Whenever the reduction of residual stress due to S. R. treatment in welded structure is considered, therefore, the effect of welded part should be taken into account.

• 社団法人溶接学会の論文
• 1970-11-25

著者

• 田中 甚吉

  日本鋼管株式会社

• 小幡 忠良

  日本鋼管株技術部研究所

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