Inconel718合金金属注射成形制备过程及力学性能

以Inconel718气雾化预合金粉末为原料,采用金属注射成形(MIM)工艺制备Inconel718合金材料.研究Inconel718合金烧结、热等静压(HIP)、热处理对合金显微组织、密度和力学性能的影响.结果表明:经1275 ℃烧结后,烧结体的相对密度达到98%.烧结体经HIP处理后,达到全致密.经烧结+HIP+热处理后,组织弥散析出了大量的γ″相和γ′相,其室温抗拉强度为1250 MPa,延伸率为21.7%;650 ℃抗拉强度为1177 MPa,延伸率为16.6%,其达到或超过了同牌号锻造合金的性能.

Preparation and Mechanical Properties of Inconel718 Alloy by Metal Injection Molding

Effects of sintering temperature, hot isostatic pressing(HIP)and heat-treatment on the microstructure, density and mechanical properties of Inconel718 alloy prepared by metal injection molding were investigated. The results show that the sintered alloy with a relative density of 98% can be achieved at 1275 °C. After HIP process, full density was achieved. After heat-treatment, a large amount of γ″ and γ′ phase were precipitated which increases the tensile strength and decreases the elongation of the alloy. The tensile strength and elongation were 1250 MPa and 21.7%, respectively, at room temperature, and 1177 MPa and 16.6% at 650 °C respectively, which are comparable with or superior to those of the wrought alloy.