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前言发电设备的许多金属部件,例如汽轮机大轴、叶轮、发电机转子、护环等大型转动部件;锅炉管道、汽包等承压部件以及螺栓等紧固件;在冶金、锻造、机械加工、热处理和焊接安装过程中,由于种种原因,不可避免出现一些材料和结构上的缺陷。即使原来完好的部件材料,在运行过程中,由于受各种类型的应力,温度和环境介质短时间或长时间的作用,也必然会出现损伤。
Preface Many of the metal components of power generation equipment, such as large rotating parts such as steam turbine shaft, impeller, generator rotor and retaining ring, pressure-bearing parts such as boiler pipes and drums, and fasteners such as bolts, are widely used in metallurgy, forging, During the heat treatment and welding installation process, due to various reasons, some material and structural defects are inevitable. Even if the original intact parts materials, during operation, due to various types of stress, temperature and environmental media for a short period of time or a long time, but also inevitable damage.