论文部分内容阅读
一、叶片断裂概况××电厂20万千瓦汽轮机组(材质为2Cr13)的35级反向动叶片在两年时间内先后发生了五次断裂。本文分析的第五次断裂事故是在第四次更换运行仅12天后发生的。叶片叶身高313毫米,叉形叶根。每7～9只叶片为一组,装焊两道冷轧回火的1Cr13拉筋,叶高155毫米处焊第一道φ12毫米拉筋,离叶顶40毫米处焊第二道φ8毫米拉筋。装焊钎料为料303(Ag45Cu30Zn25),熔点
First, the blade rupture overview × × power plant 200,000 kilowatts steam turbine (material 2Cr13) 35 reverse moving blades in two years time there have been five times the fracture. The fifth fault analyzed in this paper occurred just after 12 days of the fourth changeover operation. Leaf blade height 313 mm, fork-shaped root. Each group of 7 to 9 leaves were welded and welded with two 1Cr13 steel bars for cold rolling and tempering. The first round of φ12 mm steel was welded at a height of 155 mm and the second was φ8 mm from the top of the blade welded at 40 mm Ribs. Welding solder material 303 (Ag45Cu30Zn25), melting point