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.

用于航空发动机涡轮的传统高温合金已达到其使用温度上限，正在开发具有更高高温能力的TiAl和Ni3Al基合金。它们的使用需要对其进行焊接来制造和修理航空涡轮机部件。这些材料还需要与传统的镍高温合金连接。镍高温合金和金属间合金都极难焊接，但由于它们的化学成分和微观结构存在显着差异，将它们连接在一起变得更具挑战性。因此，拟议研究的长期目标是获得使用新兴焊接工艺连接当前和新一代铝化物基航空涡轮材料的科学和技术的基础知识，以开发可靠的连接程序。短期内，该研究将研究多晶 IN 738 和单晶 CSMX 486 Ni 高温合金与单晶 NI3AL 基合金 IC 6 焊接过程中的焊缝裂纹问题，并开发产生无裂纹焊缝的方法。这将通过使用各种填充合金的焊接实验以及使用各种工艺参数的激光焊接、激光电弧复合焊接和线性摩擦焊接期间的焊前和焊后加热来实现。与过去一样，焊接实验将在标准航空公司进行。 Inc. 温尼伯和蒙特利尔 NRC 航空航天制造技术中心。焊缝裂纹和焊缝的微观结构将通过申请人实验室中可用的最先进的微观结构表征设施进行评估，以确定工艺参数和填充合金成分对焊缝质量的作用。然后，将通过数值建模来优化工艺参数和填充合金成分，并通过进一步的实验来验证开发的模型。计划培养硕士2名。和 2 名博士生通过拟议的研究。这项研究将有助于开发基于镍和钛铝化物的新兴航空涡轮材料的焊接工艺，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。