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对已经开裂的汽轮机转子轮盘的工艺孔进行了形貌观察、金相组织检验、断口能谱分析、工艺孔内壁的粗糙度、轮盘材料的化学成分分析及力学性能等检验,同时结合有限元模拟计算粗糙度对轮盘工艺孔强度的影响,分析了汽轮机转子轮盘工艺孔开裂的原因。结果表明:转子轮盘工艺孔内表面粗糙度过大,局部腐蚀介质聚集而形成裂纹,加之轮盘运行过程中的拉应力集中加快了裂纹的萌生及扩展,最终导致该汽轮机转子轮盘工艺孔的应力腐蚀开裂失效。
Morphology observation, metallographic examination, fracture energy spectrum analysis, the roughness of the inner wall of the process hole, the chemical composition analysis of the roulette material and the mechanical property test of the cracked turbine rotor disk were performed. At the same time, The influence of roughness on the hole strength of roulette wheel was calculated by element simulation, and the reason of cracking of the hole was analyzed. The results show that the roughness of the surface of the rotor disk is too large and the local corrosion medium is aggregated to form cracks. In addition, the tensile stress concentration during the running of the disk accelerates the initiation and propagation of the crack, finally leading to the rotor disk hole The stress corrosion cracking failure.