ハステロイ X TIG 周継手円筒の高温内圧クリープ強度 : ハステロイ X 溶接継手円筒の高温内圧クリープ挙動の研究(第 1 報)

概要

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Creep tests on circumferentially TIG-welded Hastelloy x cylinders were carried out under internal pressure for the investigation of structural behavior of welded components in high temperature environment. The creep rupture strength of TIG-welded cylinders was much lower than that of non-welded cylinders, while such reduction was not found in uniaxial creep tests on TIG-welded bars. It was deduced that the reduction was due to the low ductility (ranging from 1 to 5%) of the weld metal to which enhanced creep was induced by the adjacent base metal whose creep strain rate was much higher than that of the weld metal. Therefore, uniaxial creep tests on bar specimens is not sufficient for proper assessment of the creep rupture strength of welded components. Both creep strain rate and creep ductility should be concerned for the assessment. Creep tests by using components such as cylinder under internalpressure are recommendable for the confirmation of creep strength of welded structures and components.
社団法人溶接学会の論文
1981-09-05