固溶处理对微弧等离子增材制造Inconel 625构件力学性能的影响

Effect of Solution Treatment on Mechanical Properties of Inconel 625 Fabricated by Micro-arc Plasma Additive Manufacturing

摘要:

为研究固溶处理对微弧等离子增材制造Inconel 625构件力学性能的影响，本文采用在950℃、1050℃、1150℃和1250℃条件下对增材制造INCONEL 625合金薄壁构件试样进行了固溶处理。研究表明，随着固溶温度升高晶粒回溶程度不断增大，生长取向变得杂乱；位错密度逐渐降低且分布位置集中在晶界区域；析出物逐渐减小，出现回溶过程。随温度升高，结构内部的固溶强化使抗拉强度得到提升，但应变强化减弱导致屈服强度降低，同时Laves相对位错滑移的阻碍作用减弱使薄壁构件的延伸率得到提升。经测试，屈服强度、抗拉强度及延伸率在1150℃固溶处理后达到最优，固溶处理后薄壁结构抗腐蚀能力得到明显提升。这为微弧等离子增材制造INCONEL 625薄壁构件力学性能优化提供了支撑。

Abstract:

In order to study the influence of solution treatment on the mechanical properties of INCONEL 625 components manufactured by micro-arc plasma additive, the samples of Inconel 625 alloy thin-walled components manufactured by additive were solution treated at 950℃, 1050℃, 1150℃ and 1250℃. The results show that with the increase of solution temperature, the degree of grain remelting increases continuously, and the growth orientation becomes disordered. The dislocation density gradually decreases and its distribution is concentrated in the grain boundary area. The precipitates gradually decrease, and the process of dissolution occurs. With the increase of temperature, the solution strengthening inside the structure improves the tensile strength, but the weakening of strain strengthening leads to the decrease of yield strength. At the same time, the weakening of Laves" resistance to dislocation slip improves the elongation of thin-walled members. After testing, the yield strength, tensile strength and elongation reached the best after solution treatment at 1150℃, and the corrosion resistance of thin-walled structure was significantly improved after solution treatment. This provides support for the optimization of mechanical properties of INCONEL 625 thin-walled components manufactured by micro-arc plasma additive manufacturing.