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结合火力发电设备大型锅炉集箱管座焊接接头破裂情况,本文重点研究了12Cr1 Mov钢母材、手工焊的焊缝、热影响区的蠕变、蠕变～疲劳交互作用下裂纹开裂和扩展特性,同时也测定了母材、焊缝和热影响区的蠕变断裂韧性值,用来评定焊接接头抗蠕变脆性特性的好坏.另外还研究了回火温度对12Cr 1 MoV钢母材,焊缝和热影响区裂纹开裂和扩展及蠕变断裂韧性影响,从改善焊接接头抗裂纹开裂和扩展能力新观点出发,来确定焊后最佳热处理。
Combining with the crack of welding joint of large boiler headers in thermal power plant, this paper focuses on the weld crack of 12Cr1 Mov base steel, hand welding, the creep of the heat affected zone and the cracking and propagation of crack under the creep-fatigue interaction , As well as the creep rupture toughness values of the base metal, weld and heat affected zone were also measured to evaluate the creep brittleness characteristics of the welded joint.Also the effects of tempering temperature on the 12Cr 1 MoV steel base metal, Weld and heat affected zone crack cracking and expansion and creep rupture toughness, from the new point of view to improve the crack resistance weld cracking and expansion of ability to determine the best heat treatment after welding.