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针对激光再制造汽轮机转子轴颈,在汽轮机转子激光再制造后的综合跳动(TIR)控制在6.35μm以内的前提下,选用铁基粉末进行力学性能测试,研究了激光再制造层与基体复合材料的拉伸、冲击与弯曲等力学性能.结果表明:复合材料的抗拉强度和抗弯强度分别比基体材料28CrMoNiV的平均抗拉和抗弯强度提高11.29%和24.11%,复合材料的平均冲击吸收功为39J;根据并联力学性能模型的混合律,激光再制造层的力学性能优于基体材料28CrMoNiV;激光再制造层中一次晶轴与二次晶轴的数量远大于基体材料,高密度的位错阻碍了晶界滑移,使抗拉伸强度提高;再制造层晶粒相对基体材料小而密集,裂纹扩展路径曲折,裂纹萌生功的提高使韧性增强.
Aiming at the laser remanufacturing turbine rotor journal, the mechanical property test of iron-based powder was carried out under the condition of TIR controlled within 6.35μm after laser remanufacturing of turbine rotor. The effects of laser remanufacturing layer and matrix composites The results show that the tensile strength and flexural strength of the composites increase by 11.29% and 24.11% respectively than that of 28CrMoNiV, and the average impact absorption of the composites According to the mixing law of parallel mechanical properties model, the mechanical properties of laser remanufactured layer is better than that of base material 28CrMoNiV. The number of primary and secondary crystal axes in laser remanufactured layer is much larger than that of matrix material and high density The error prevents the grain boundary from sliding and increases the tensile strength. The re-manufactured layer grains are small and dense with respect to the matrix material, the crack propagation path is tortuous, and the improvement of the crack initiation power enhances the toughness.