11/4 Cr-1/2Mo 鋼溶接部のクリープ割れ感受性の改善

概要

論文の詳細を見る
The creep cracking caused by the high temperature and high pressure environment has been reported in the welds of Cr-Mo steels used for the chemical reactor vessels. So the mechanism and prevention of creep cracking of Cr-Mo steel welds were investigated in connection with reheat cracking using the creep rupture test and the SERT test. From the observation of scanning electron micrographs of fracture surface and optical microstructures of fracture appearance, it is confirmed that the creep cracking could be simulated either by the creep rupture test or the SERT test. Therefore the susceptibility to the creep cracking can be evaluated from the reduction of area in the creep rupture test or the SERT test. And it is concluded that the susceptibility to the creep cracking of 11/4Cr-1/2Mo steel decrease with the combination of the stress relief treatment at high temperature, the decrease of carbon content and the reduction of copper and nickel.
社団法人溶接学会の論文
1981-11-05