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某热电厂的Ｂ2 5 - 8.83/ 0 .98型汽轮机在运行 4 .8× 10 4 ｈ后大修时发现 ,材质为ＺＧ15Ｃｒ1Ｍｏ1Ｖ的汽轮机自动主汽门结合面的螺栓孔之间存在两条裂纹 ,见图 1。主汽门内侧裂纹深度约为 30ｍｍ ,裂纹从内向外贯穿整个缸体厚度。另外 ,在裂纹的近末端还有一条较短的裂纹
When a B2 5 - 8.83 / 0 .98 turbine of a thermal power plant underwent overhaul after running 4.8x10 4 h, it was found that there were two cracks between the bolt holes of the steam turbine main joint of the steam turbine with the material of ZG15Cr1Mo1V 1. The depth of the crack inside the main steam valve is about 30mm, and the crack penetrates the entire thickness of the cylinder from the inside to the outside. In addition, there is a short crack near the tip of the crack