长期运转的成套发电设备、大型运输设备等在整个使用过程中常需进行相当次数的大修,更换较易失效的零件,以便恢复这些机械设备原有的性能。这些较易失效的零件,例如汽轮机叶片、各种转子等,大都极为昂贵。目前国际上对修复热处理十分重视,一般地对外观损伤可用“修复表面处理” Long-term operation of complete sets of power generation equipment, large-scale transport equipment, etc. often require a considerable number of overhauls throughout the course of use, replacing more easily failed parts in order to restore the original performance of these mechanical equipment. These more vulnerable parts, such as turbine blades, rotors, etc., are mostly expensive. At present, the international community attaches great importance to repair heat treatment, the general appearance of damage can be used “repair surface treatment”