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一、试验材料GH37合金是涡轮喷气发动机Ⅰ级和Ⅱ级涡轮叶片材料。发动机转子在运转过程中,由于多次反复启动和停车,使叶片材料经受着蠕变/疲劳交互作用。在该型发动机返修中发现有的叶片产生折断。故障统计表明,叶片早期折断与材料的热处理制度有关。叶片热处理工艺原规定二次淬火后缓冷,即出炉后用石棉板加盖,成堆冷却。有一段时期曾改为出炉后散放冷却,结果发现折断叶片大多为二次淬火后散
First, the test material GH37 alloy turbine turbojet class Ⅰ and Ⅱ turbine blade material. During operation, the engine rotor undergoes a creep / fatigue interaction due to repeated start-up and shutdown. In this type of engine repair found some leaves broken. Fault statistics show that the blade early fracture and the material heat treatment system. The original heat treatment process leaves the provisions of the secondary quenching slow cooling, that is released with asbestos board stamped, piles of cooling. For a period of time has been released after the release of cooling, the results found that most of the broken leaves after the secondary quenching