Advanced Joining of Gamma Prime Precipitation Strengthened Cobalt-base Superalloy

*加拿大航空航天部门的飞机发动机和部件维护、维修和大修活动创造了超过30亿美元的年收入。γ具有更高熔化温度的沉淀强化钴基高温合金的能力，增加了这些材料的性能超过并取代目前在航空航天和发电应用的下一代燃气轮机发动机中使用的一些镍基高温合金的可能性。然而，为了充分开发这些新兴高温合金的巨大潜力，有必要深入研究先进的连接技术在制造和修复由这些材料制成的受损发动机部件时的适用性。不幸的是，过去40年在高温合金发展方面取得的进步并没有与这些先进材料的适当连接技术的开发充分匹配。拟议的研究将广泛使用最先进的电子显微镜和光谱技术并结合数值和物理模拟来研究和开发可行的程序来激光焊接新开发的γ沉淀强化钴基高温合金，而不会出现困扰γ强化高温合金焊接的开裂和有害微成分的形成问题。此外，这项工作将试图为新的高温合金开发一种有效的方法，以减少延长的加工时间，这一直是另一种适用于先进难焊接材料的瞬时液相连接技术工业化应用的主要障碍。拟议的研究将提供至关重要的新知识，这些知识将促进我们对如何在飞机和发电发动机的制造和维修过程中有效和高效地连接由新出现的高温合金制成的部件的理解。*这项研究将帮助培训和装备至少8名HQP掌握关键技能，这些技能对于使用实验和理论技术分析和解决行业和学术界的实际工程问题至关重要，包括结合数值建模和模拟的显微镜和光谱分析。这项研究有可能直接使航空航天行业受益，该行业是加拿大先进技术的领先雇主和最大出口商，是加拿大经济的关键组成部分。*除了航空航天应用，HQP将获得的技能与经济中其他关键的工业部门有关，包括汽车和能源。**

***Aircraft engine and component maintenance, repair and overhaul activities in the Canadian aerospace sector generate over $3 billion in annual revenues. The ability to produce γ' precipitation strengthened Cobalt-based superalloys with higher melting temperatures has raised the possibility that these materials could out-perform and replace some of the currently used Nickel-based superalloys in next generation gas turbine engines for aerospace and power generation applications. Nevertheless, to adequately exploit the vast potentials of these newly emerging superalloys it is imperative to perform intensive research on the applicability of advanced joining techniques during manufacturing and repair of damaged engine components made from these materials. Unfortunately, the advancements that have occurred over the past four decades on the development of high temperature alloys have not been adequately matched with the development of appropriate joining techniques for these advanced materials.*******The proposed research will use extensive state-of-the-art electron microscopy and spectroscopy techniques combined with numerical and physical simulations to study and develop viable procedures to laser weld newly developed γ' precipitation strengthened Co-based superalloys without the problems of cracking and the formation of damaging micro-constituents that plague welding of γ' strengthened superalloys. Furthermore, this work will attempt to develop, for the new superalloys, an efficient method to reduce the protracted processing time that has been a major barrier to industrial application of another technique, transient liquid phase bonding, which is suitable for advanced difficult-to-weld materials. The proposed research will contribute crucial new knowledge that will advance our understanding of how to effectively and efficiently join components made of the newly emerging superalloys during manufacture and repair of aircraft and power generation engines. ******The research will help train and equip at least 8 HQP with crucial skills that are vital to the use of experimental and theoretical techniques in analyzing and solving practical engineering problems in the industry as well as in the academia, including microscopy and spectroscopy analyses combined with numerical modeling and simulation. The research has the potential to directly benefit the aerospace industry, which is a leading employer and top exporter of advanced technology in Canada, and constitutes a key component of the country's economy.*Besides aerospace applications, the skills to be acquired by the HQP are pertinent to other crucial industrial sectors of the economy including automotive and energy. **