Development and characterization of high strength / high temperature powders compositions for additive manufacturing and repair applications

发动机涡轮机部件由耐高温材料制成，通常是镍基或钴基超合金。在维修过程中，涡轮机零件可能损坏，导致发动机运行缺陷和附属部件的潜在损坏。高强度高温合金部件的制造和修复涉及复杂的多组分合金系统的使用。这是因为需要匹配合金成分，以及良好的可焊性和机械性能。到目前为止，有一个知识和模型，解决了一些关键的基本现象，在制造过程中，这样的多组分系统。这就解释了为什么目前的生产方法是从工业经验和专业知识以及昂贵和耗时的试错方法的结合中发展起来的。 该提案旨在解决多组分合金系统的现有知识差距，以允许开发更严格和系统的方法来设计和优化高温性能增材制造专用合金和相关工艺参数。 Liburdi涡轮机服务（LTS）是Liburdi Engineering（安大略省）的一个部门，是涡轮机MRO和涡轮机叶片维修的世界领导者。他们认为这项研究是通过获得与多组件建模工具包相结合的基本理解来保持竞争力和技术领先地位的途径。 在这项工作中，更好地理解的关系链接的熔点，浓度，和演变的性质的液体作为浸泡时间的函数在热处理过程中的两个多组分高温合金系统（R142和RN5）将提供。此外，将评估使用精确的粉末混合物组合物的可能性，但在激光粉末床熔合和直接能量沉积方法中使用的均匀粉末原料的框架下。这一目标的成功将允许简化原位修复，而没有成分变化的风险。

Engine turbine components are made of high temperature resistant materials, typically nickel- or cobalt-based superalloys. During service, turbine parts can become damaged resulting in engine operation deficiencies and potential damage to subjacent components. High strength superalloy component manufacture and repair involves the usage of complex multicomponent alloy systems. This stems from the need to match alloy compositions, and for good weldability and mechanical properties. To date, there is a lack of knowledge and models addressing some of the key fundamental phenomenon involved during fabrication for such multicomponent systems. This explains why the current approaches to production are developed from a combination of industrial experience and know how, and costly and time-consuming trial and error approach. This proposal is designed to address the existing knowledge gaps for multicomponent alloy systems, to permit the development of a more rigorous and systematic approach for the design and optimisation of high temperature performance Additive Manufacturing-specific alloys and associated processing parameters. Liburdi Turbine Services (LTS), a division of Liburdi Engineering (Ontario), is the world leader in turbine MRO and turbine blade repair. They see this research as an avenue to maintaining their competitiveness and technological leadership by gaining a fundamental understanding combined with a multicomponent modeling toolkit. In this work, a better understanding of the relationships linking the melting point depressant concentration, and the evolving properties of the liquid as a function of soaking time during the heat treatment for two multicomponent superalloy systems (R142 and RN5) will be provided. Also, the possibility of using the exact powder blend composition, but under the framework of a homogeneous powder feedstock to be used in Laser Powder Bed Fusion and Direct Energy Deposition methods will be evaluated. Success in this objective would allow simplified in-situ repair, without the risks of compositional variation.