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1.裂缝产生的原因叶片经退火后进水边法兰肩部发现的裂缝,断口呈灰色,裂缝断续曲折,紧靠园角 R 最小处,经电弧气刨并打磨后,发现有少量夹渣。这种裂缝属铸件表面夹杂热裂缝。另外,叶片法兰根部因铸造园角较小,造成了很高的应力集中和结构应力,在退火加热过程中在热应力作用下,使原有夹渣物成为热裂缝源并扩展暴露于表面。
1. Causes of Cracks After the leaves were annealed, they were found cracks in the shoulder of the water side of the water inlet, the fracture was gray and the cracks were intermittent and tortuous. Close to the corner of the corner, R min., After arc gouging and grinding, a few clamps Slag. This kind of crack is a hot crack in the casting surface. In addition, the root of the blade flange due to casting angle is small, resulting in high stress concentration and structural stress in the annealing process under thermal stress, the original slag into a hot crack source and extended exposure to the surface .