Synergetic interactions between metal powder tailoring, additive manufacturing and heat treatment

Brochu教授的整个研究生涯致力于将粉末冶金、快速凝固焊接和添加剂制造与先进材料和制造工艺的大众化联系起来，进行多学科的协同和综合优化。为了实现Brochu教授的长期研究愿景，目前的DG建议涉及整合、解决和优化原材料、合金成分及其凝固、加工策略和后处理热处理之间的基本竞争相互作用。创新的研究计划包括四个短期目标：(1)将粉末钝化和表面质量与其熔化/烧结行为联系起来，以解决与粉末表面属性变化相对应的知识差距，这最终是AM过程中缺陷发展的原因之一(2)高强度AM合金，以开发AM设计的新型自愈合合金，以增加目前约束AM材料的供应。(3)具有受控晶体取向的部件的LPBF，以提供一种更快、更低成本的替代路线来制造定向凝固或单晶部件，这对航空航天工业具有变革性。(4)将AM后的热处理过程与有害组织的发展联系起来，以开发适合AM组织的新的热处理工艺，以防止有害相的发展对循环力学性能产生不利影响。DG项目计划培训3名PDF、3名博士和2名研究生，这些学生将获得包括实验、编码和建模在内的协同和多学科技能。具体地说，不同的HQP将获得与表面表征、AM方案的优化、材料表征、凝固取向建模和固态相变相关的尖端知识和关键技能。DG项目培养了一支高技能和高知识的劳动力队伍，将改变多个领域，包括金属粉末制造、AM印刷局、原始设备制造商、维护、维修和大修公司、热处理专业公司等。麦吉尔位于蒙特利尔，是这些促进航空航天集群和相关供应链的工业部门的核心。

Prof. Brochu has focused his entire research career on the synergic and integrative multi-disciplinary optimisation linking powder metallurgy, rapid solidification welding and additive manufacturing to democratise advanced materials and manufacturing processes. To realise Prof. Brochu's long term research vision, this current DG proposal involves integrating, solving and optimizing the fundamental competitive interactions between the starting materials, alloy composition and its solidification, processing strategies and post-processing heat treatments. The innovative research program was designed to encompass four short term objectives: (1) Linking powder passivation and surface quality to their melting/sintering behavior, in order to address the knowledge gap corresponding to the variability in powder surface properties that is ultimately one of the causes for defect development during AM. (2) High strength AM alloys, in order to develop new AM-designed self-healing alloys that will increase the currently restraint AM materials offering. (3) LPBF of parts with controlled crystallographic orientation, in order to provide a faster and lower-cost alternative route to manufacture directionally solidified or single crystal components, transformative for the aerospace industry. (4) Linking post-AM thermal processes to deleterious microstructure development, in order to develop new heat treatments adapted to the AM microstructure to prevent the development of the deleterious phases negatively impacting the cyclic mechanical properties. The DG program plans to train 3PDFs, 3 PhDs and 2 MEngs students that will gain synergetic and multi-disciplinary skills encompassing experimentation, coding and modeling. Specifically, cutting edge knowledge and critical skills related to the surface characterisation, optimisation of AM protocols, materials characterisation, modeling of solidification orientation and solid-state phase transformation will be gained by the different HQPs. The DG program, resulting in a highly skilled and knowledgeabled workforce, will transform several fields including metal powder manufacturing, AM printing bureau, original equipment manufacturers, maintenance, repair and overhaul companies, heat treatment-specialised companies, etc. McGill, located in Montreal, is central to these industrial sectors contributing to the aerospace cluster and related supply chain.