Ni3Al基IC6高温合金工程应用研究

IC6合金是在"863"计划支持下,由北京航空材料研究院研制成功的一种定向凝固Ni3Al基高温合金.选用该合金试制某新型航空发动机整体定向凝固Ⅱ级导向器叶片.由于该叶片尺寸大、形状复杂,给铸造工艺带来很大难度.经过合理设计浇注系统,实现了定向柱晶从叶身向缘板平滑过渡弯晶生长,有效地消除了叶身和缘板转接处的晶界裂纹,使叶片的毛坯合格率由原来的5%攀升到62%,超过了"863"计划规定的50%的指标.在此基础上,对Ⅱ级导向器叶片的铸造工艺稳定性,真空热处理工艺,叶片表面防护涂层工艺,返回料的应用进行了系统的工程应用研究.该叶片已通过技术鉴定,转入批生产,目前已生产65台叶片,在使用中工作正常,没有出现任何材料质量问题.

Research on engineering application of Ni3Al-base superalloy IC6

Alloy IC6 is a DS (directional solidification) Ni3 Al base superalloy developed by Beijing Institute of Aeronautical Materials based on the support of "863" Program. This alloy is used to trial produce integrated DS nozzle vanes for new-style aero-engine. The nozzle vane is difficult to be cast due to its large size and complicated shape. After pouring system being reasonably designed, the directional column grains are smoothly blended from airfoil to platform and grow deviously, which effectively eliminates boundary cracks on radius between airfoil and platform and makes the rate of acceptable castings raised from 5 % to 62 % , which exceeds the 50% specified by "863" Program. With this development, casting process stability, vacuum heat treatment process, surface-protective coating process and the use of revert for nozzle vanes are systematically researched for their engineering application. The nozzle vanes have passed technological demonstration and put into batch production. 65 sets of vanes have been produced by far, whose performances are satisfing during being used and no any quality problems of material occur.