Welding of Single and Polycrystal Nickel Superalloys to Aluminides Based Aero-engine and Power Generation Turbine Materials by New and Emerging Joining Technologies

采用新兴连接技术将单晶和多晶镍高温合金焊接到铝化物基航空发动机和发电涡轮材料上

• 批准号: 5841-2013
• 负责人: Chaturvedi, Mahesh
• 金额: $ 1.82万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638110
• 关键词: Welding; Single; Polycrystal; Nickel; Superalloys

Conventional high-temperature superalloys used in aero-engine turbines have reached their upper temperature application limit, and TiAl and Ni3Al based alloys with a higher high temperature capability are being developed. Their use would require them to be welded to fabricate and repair aero-turbine components. These materials would also need to be joined to conventional Ni superalloys. Both, Ni superalloys and Intermetallic alloys are extremely difficult to weld, but joining them together becomes even more challenging due to a significant disparity in their chemistry and microstructure. Therefore, the LONG-TERM objective of the proposed research is to obtain a basic knowledge of the science and technology of joining of current and new generation aluminide based aero-turbine materials using emerging welding processes to develop reliable joining procedures. In the SHORT-TERM the research will investigate the weld cracking issues during welding of polycrystalline IN 738 and single crystal CSMX 486 Ni superalloys to single crystal NI3AL based alloy IC 6, and develop methods to produce crack-free welds. This will be achieved through welding experiments using various filler alloys and pre and post-weld heating during laser welding, laser-arc hybrid welding and linear friction welding using various process parameters. As in the past, the welding experiments will be performed at Standard Aero. Inc. Winnipeg, and NRC Aerospace Manufacturing Technology Centre, Montreal. Weld cracking and microstructures of the welds will be evaluated, by state-of-the-art microstructure characterization facilities available in applicant's laboratory, to determine the role of process parameters and filler alloy composition on quality of welds. Process parameters and filler alloy compositions will then be optimized through numerical modeling, and the developed model will be validated by further experimentation. It is planned to train 2 M.Sc. and 2 PhD students through the proposed research. This research will help develop welding procedures for Ni and Ti aluminide based emerging aero-turbine materials, and help enhance Canadian Aerospace companies' competitive position in the world markets.

航空发动机涡轮机中使用的常规高温超合金已经达到其高温施用极限，并且正在开发具有较高高温能力的TIAL和NI3AL合金。他们的使用将要求它们焊接以制造和修复空气涡轮组件。这些材料也需要加入常规的NI超级合金。 NI超合金和金属合金都难以焊接，但是由于其化学和微观结构存在很大的差异，将它们加在一起变得更加具有挑战性。因此，拟议研究的长期目标是使用新兴焊接过程来获得基于当前和新一代铝制的航空涡轮的科学和技术的基本知识，以开发可靠的加入程序。在短期内，该研究将研究738中多晶的焊接过程中的焊缝开裂问题，以及单晶CSMX 486 Ni Superalys与单晶Ni3al基于基于Ni3Al的合金IC 6，并开发出生产无裂纹焊接的方法。这将通过焊接实验使用各种填充合金以及在激光焊接，激光 - ARC混合焊接和线性摩擦焊接过程中使用各种过程参数的焊接合金和焊接后加热来实现。与过去一样，焊接实验将在标准AERO上进行。温尼伯市和蒙特利尔的NRC航空航天制造技术中心。焊缝的焊缝开裂和微结构将通过申请人实验室中可用的最新微观结构表征来评估，以确定过程参数和填充合金组成在焊缝质量上的作用。然后，将通过数值建模来优化过程参数和填充合金组成，并通过进一步的实验来验证开发的模型。计划训练2 M.Sc.和2名博士生通过拟议的研究。这项研究将有助于为基于NI和Ti铝制的新兴航空涡轮材料制定焊接程序，并有助于增强加拿大航空航天公司在世界市场上的竞争地位。