Inconel718合金金属注射成形制备过程及力学性能(英文)

Preparation and Mechanical Properties of Inconel718 Alloy by Metal Injection Molding

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1250MPa,延伸率为21.7%;650℃抗拉强度为1177MPa,延伸率为16.6%,其达到或超过了同牌号锻造合金的性能。

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℃.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℃ respectively,which are comparable with or superior to those of the wrought alloy.