重复固溶对Inconel 718合金组织性能的影响

以982℃固溶水冷状态的Inconel 718合金棒材为研究对象,分析该合金经重复固溶再时效处理后的组织性能,并与直接时效处理进行对比。结果表明:在941~1010℃范围内重复固溶,随着固溶温度的升高,晶粒无明显变化,但是δ相含量逐渐减少,主要强化相γ′′的析出量增多,使合金硬度、高温拉伸强度和高温持久寿命显著提高,高温拉伸塑性、高温持久塑性在982℃固溶时达到极大值。与直接进行时效处理相比,经982℃重复固溶再时效处理后的组织性能无明显变化,更低的重复固溶温度对性能不利,而更高的重复固溶温度则使性能提高。

Effect of re-solution treatment on microstructure and mechanical property of nickel-base alloy Inconel 718

The microstructures and mechanical properties of Inconel 718 alloy were analyzed by using 982℃water cooled solid solution bar after repeated solution and re-aging treatment,and compared with direct aging treatment.The effects of repeated solution treatment temperatures ranging from 941 to 1010℃on microstructures and mechanical properties of the alloy were systematically studied.The results show that with the increase of repeated solution temperature,the content ofγ′′phase/δphase gradually increases/decreases with no obvious change in grain size,leading to an evident improvement on room-temperature hardness,high-temperature tensile strength and stress-rupture life of the alloy.The maximum values of the tensile elongation and the stress rupture ductility are reached at the repeated solution temperature of 982℃.As compared to the direct aging treatment condition,there is no apparent change in microstructure and mechanical properties of the alloy aged after the repeated solution treatment at 982℃.On the contrary to the higher repeated solution temperature,the lower repeated temperature produces unfavorable effect on the mechanical properties.