磷对GH761合金固溶水淬组织屈服强度的影响

Effect of phosphorus on the yield strength of as-quenched GH761 alloy

通过固溶水淬处理抑制γ’相析出,获得单一γ相组织,研究了磷对GH761合金基体γ相的强化作用及其机制．结果表明,磷对合金的晶粒组织没有显著影响,但是使GH761合金基体γ相的室温和650℃拉伸屈服强度和室温硬度提高．磷对基体变形过程中的位错运动具有明显的影响,低磷含量时滑移线平直;磷含量升高使滑移线弯曲并互相缠结．磷提高合金基体的强度,阻碍品粒变形,是其降低合金蠕变速率的重要原因．

A single γ phase microstructure was gained by solutioning the alloy at 1120 ℃ and water quenching, and then the effect of phosphorus on the γ matrix of GH761 alloy was investigated. Phosphorus exhibits little effect on the metallographic microstructure of GH761 alloy with the single γ phase microstructure, but increases the yield strength at room temperature and 650 ℃, and the hardness at room temperature. Phosphorus noticeably influences the dislocation sliding during the deformation of the alloy, the slip lines are straight when phosphorus content is lower, and it become curved and entangled when phosphorus content is increased. It is determined that phosphorus decreases the creep rate of GH761 alloy by increasing the yield strength and inhibiting the deformation of the γ matrix.