In-situ grain boundary engineering via metal additive manufacturing

我们的目标是开发一种通过金属3D打印进行有针对性的特种合金微结构设计的能力。我们在不锈钢和高温合金中生成定制晶界网络的方法将释放优异的机械、腐蚀和工艺性能，而无需后续的热机械处理。科学成果是关于通过再结晶和耦合偏析-析出现象有针对性地选择理想界面的新的物理冶金知识。技术成果是为打印具有定制微结构的部件加工地图。这将减少各向异性、残余应力和缺陷，有利于国防、航空航天和能源应用，所有这些都对澳大利亚经济至关重要。

We aim to develop a capability for targeted specialty alloy microstructure design via metal 3D printing. Our approach to generate customised grain boundary networks in stainless steels and superalloys will unlock superior mechanical, corrosion and technological properties, without subsequent thermomechanical treatments. Scientific outcomes are new physical metallurgy knowledge on the targeted selection of desirable interfaces via recrystallisation and coupled segregation-precipitation phenomena. Technological outcomes are processing maps for printing parts with customised microstructures. This will diminish anisotropy, residual stress and defects, benefitting defence, aerospace and energy applications, all vital to the Australian economy.