摘要
本文对服役过10万、14万及18万小时的三种Cr5Mo管材分别作了试验研究,发现管材在500℃时出现了回火脆性,并且经高温运行后的管材的室温冲击韧性远低于新管材的冲击韧性,但其室温断裂韧性与冲击韧性在100℃以上使用时仍是足够的。
The new and old Cr5Mo pipe joints welded with austenitic stainless steel electrode are investigated experimently. Test results show that carbon transfer from Cr5Mo to weld metal has taken place in the fusion zone of the old joint. There is a hard carbide layer, 0.05mm in thickness, in the fusion zone on the weld metal side, therefore, the notch toughness and fracture toughness at room temperature in this zone of the weld joint which has served at 500℃ for over 14 thousand hours are much lower than that of new joint. At the temperature of over 400℃, however, its notch toughness is almost as high as that of the new one.
出处
《压力容器》
1992年第2期15-21,共7页
Pressure Vessel Technology
