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

作　　者：胡幼华[1,2] 李益民[1,2] 何浩[1,2] 娄嘉[1] 汤潇[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]湖南英捷高科技有限责任公司,湖南长沙410083

出　　处：《稀有金属材料与工程》2010年第5期775-780,共6页Rare Metal Materials and Engineering

基　　金：the National Natural Science Foundation of China (50721003);National Department of Science and Technology of China under "863" Program (2007AA03Z114)

摘　　要：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.

关 键 词：INCONEL718合金 金属注射成形 烧结 热等静压 热处理 

分 类 号：TF124.39[冶金工程—粉末冶金]