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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Ni_3Al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。
IC6 alloy is a directional solidification Ni_3Al based superalloy successfully developed by Beijing Institute of Aeronautical Materials with the support of “863” program. Selection of the alloy trial of a new type of aeroengine solidification orientation II-level guide blade. Due to the large size of the blade, the shape is complex, casting process to bring great difficulty. Through the reasonable design of the pouring system, the directional columnar crystal grows smoothly and smoothly from the blade body to the edge plate, thereby effectively eliminating the grain boundary cracking at the blade body and the edge plate transfer region, so that the blank passing rate of the blade is increased from 5 % Climbed to 62%, surpassing the 50% target set by the “863” plan. On this basis, the system engineering application research on the casting process stability, the vacuum heat treatment process, the blade surface protective coating technology and the application of the return material of the grade II guide vanes was carried out. The blade has passed the technical appraisal, into the batch production, has now produced 65 leaves, working in normal use, without any material quality problems.