Understanding properties of a new high gamma' alloy processed in different solidification environment

高伽马优质镍基高温合金的制造具有挑战性，特别是在凝固过程中。利伯迪透平服务公司(LTS)开创了一种制造高伽马优质部件的新途径，通过直接优化化学成分，在具有高应变时效抗裂性的同时，能够幸存下来。LTS和McGill之前曾研究过两种很有前途的合金，即4275和4280，而第三代合金4280W最近获得了专利，预计将超过4275和4280的焊接性、延展性和氧化性能。然而，必须进行系统的研究，以全面描述快速到非平衡区的凝固行为、对热处理的响应以及机械性能。目前LTS和Brochu教授的项目旨在研究一种新获得专利的合金：4280W的加工-性能-组织关系。该项目包括焊接材料表征、钨极气体保护焊、直接能量沉积和激光粉床熔合、工艺优化、显微组织表征和高温响应以及氧化、拉伸和持久试验。LTS将获得4280W整体制造流程图的知识，从而能够为客户生产零件或进行高伽马优质合金的维修。该项目将培训1名博士生和1名兼职PDF，1名技术人员参与。

High gamma prime Ni-based superalloys are challenging for manufacturing, particularly during solidification. Liburdi Turbine Services (LTS) is pioneering a new avenue to manufacture high gamma prime components with the direct optimization of chemical composition capable to survive solidification while possessing high strain age cracking resistance. LTS and McGill have previously studied two promising alloys, namely 4275 and 4280 while a 3rd generation of alloy, 4280W, has been recently patented and is foreseen to surpass the weldability, ductility and oxidation properties of 4275 and 4280. However, a systematic study must be performed to fully delineate the solidification behavior in rapid to non-equilibrium regimes, the response to heat treatment (HT) and the mechanical performance.The current project between LTS and Prof. Brochu aims to study the processing-properties- microstructure relationships of a newly patented alloys: 4280W. The project includes welding materials characterisation, gas tungsten arc welding, direct energy deposition and laser powder bed fusion, process optimisation, microstructure characterisation and HT response and oxidation, tensile and stress rupture testing. LTS will gain knowledge on the holistic manufacturing flowchart for 4280W leading to the ability to produce parts or perform repair of high gamma prime alloys for their customers.The project will train 1 PhD student and 1 part-time PDF, with the participation of 1 technician.