On the development of Ni powder metallurgy alloys

浅谈Ni粉末冶金合金的发展

• 批准号: 1254-2009
• 负责人: Caley, William
• 金额: $ 2.19万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=449245
• 关键词: development; Ni; powder; metallurgy; alloys

Sintered powder metallurgy (PM) alloys are an attractive material for the aerospace and automotive industries as high strength/low weight substitutes for traditional products. For the aerospace industry pressure has been placed on the metallurgical community to develop new routes for processing Ni and Co-based Superalloys for gas turbine use due to the necessity to improve performance and reduce noxious emissions. Attempts to develop new materials using the attractive mechanical properties of intermetallics have been only marginally successful due to their inherent brittle nature. However PM is used to produce turbine disks and the fine grain nature along with near net shape capability of PM should be attractive for afterburner and combustor liners. PM formed Superalloys can also possess a more uniform microstructure thereby improving low cycle thermo-mechanical fatigue. Unfortunately, only a limited number of prealloyed/master alloy Superalloy powders are available and at times these have been found to suffer from heterogeneity in powder grain composition. As well, poor compressibility and associated residual porosity on sintering have plagued the development of new Ni PM alloys and applications. Thus the two objectives of this proposal are to continue research on development of a Ni-Cr-Fe based PM Superalloy similar to IN600 with minimal residual porosity and improved compressibility and to improve the oxidation resistance of the optimised Ni PM alloy by rare earth additions and/or additions of Y.

烧结粉末冶金 (PM) 合金作为传统产品的高强度/轻重量替代品，对于航空航天和汽车行业来说是一种极具吸引力的材料。对于航空航天工业来说，由于需要提高性能和减少有害排放，冶金界面临着开发用于燃气轮机使用的镍基和钴基高温合金加工新路线的压力。由于金属间化合物固有的脆性，利用金属间化合物有吸引力的机械性能开发新材料的尝试仅取得了一定程度的成功。然而，粉末冶金用于生产涡轮盘，粉末冶金的细晶粒特性以及近净形状能力对于加力燃烧室和燃烧室衬里来说应该具有吸引力。粉末冶金成型的高温合金还可以拥有更均匀的微观结构，从而改善低循环热机械疲劳。不幸的是，只有有限数量的预合金/中间合金高温合金粉末可用，并且有时发现这些粉末颗粒成分不均匀。 此外，较差的压缩性和相关的烧结残余孔隙率也困扰着新型镍粉末冶金合金的开发和应用。因此，本提案的两个目标是继续研究开发类似于 IN600 的 Ni-Cr-Fe 基 PM 高温合金，具有最小的残余孔隙率和改善的压缩性，并通过添加稀土和/或添加 Y 来提高优化的 Ni-PM 合金的抗氧化性。