采用宏观形貌观察、尺寸测量、力学性能测试、金相分析、断口形貌分析和断口微区成分分析等方法,对某1 000 MW核电机组汽轮机碟簧断裂原因进行了分析。结果表明,碟形弹簧的断裂性质按断裂先后顺序依次为点腐蚀损伤、应力腐蚀开裂和脆性断裂,引起点腐蚀损伤的原因为碟形弹簧服役环境中腐蚀性元素的作用,过大的压缩量加速了碟簧的早期失效。 The fracture reason of the disc spring of a 1 000 MW nuclear power unit steam turbine was analyzed by macroscopic observation, size measurement, mechanical property test, metallographic analysis, fracture surface morphology analysis and fracture micro-composition analysis. The results show that the fracture properties of the disc springs in the order of fracture are pitting corrosion, stress corrosion cracking and brittle fracture, and the cause of pitting corrosion is the action of corrosive elements in the service environment of the disc spring. The excessive compression Accelerated early failure of the disc spring.