对服役１０年的汽轮机末级叶片材料进行了力学性能实验，并与未服役的新叶片材料进行对比。结果表明服役材料弹性模量Ｅ、断裂韧度Ｊ０．２及ＪＲ阻力曲线以及冲击韧度ＡＫ都有所下降，而静拉伸的伸长率及断面收缩率有所升高。以上变化主要反映在裂纹萌生阶段，微观分析表明服役材料在服役载荷作用下有些夹杂或第二相与基体脱离形成了微空洞损伤，服役材料的微观应力减小及位错组态变化都是导致上述性能变化的原因。 Mechanical performance experiments were performed on the 10-year steam turbine final stage blade materials and compared with the non-service new blade materials. The results show that the elastic modulus E, the fracture toughness J0.2, the JR resistance curve and the impact toughness AK of the service materials decrease, while the elongation and the reduction of area of ​​the static tensile increase. The above changes are mainly reflected in the crack initiation stage. The microscopic analysis shows that some inclusions of the service materials under service load or the second phase detaches from the matrix to form microcavity damage, and the microscopic stress reduction and the dislocation configuration change of the service materials lead to The reasons for the above performance changes.