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

高γ素数镍基高温合金的制造具有挑战性，特别是在凝固过程中。Liburdi涡轮服务公司（LTS）开创了一种新的途径，通过直接优化化学成分来制造高γ质数组件，这些组件能够在凝固过程中幸存下来，同时具有高应变时效抗裂性。LTS和McGill之前研究了两种很有前途的合金，即4275和4280，而第三代合金4280W最近已获得专利，预计其可焊性、延展性和氧化性能将超过4275和4280。然而，必须进行系统的研究，以充分描述在快速到非平衡状态下的凝固行为，对热处理（HT）的响应和机械性能。目前LTS和Brochu教授之间的项目旨在研究一种新专利合金：4280W的加工-性能-微观结构关系。该项目包括焊接材料表征、钨气弧焊、直接能量沉积和激光粉末床熔合、工艺优化、微观结构表征、高温响应和氧化、拉伸和应力断裂测试。LTS将获得有关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γ素质合金的维修。本项目将培养博士生1名，兼职PDF 1名，技术人员1名。

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.