Materials characterization of new commercial Fe-based alloys specifically designed for additive manufacturing

拟议的项目涉及两种新的商业合金的材料特性：i)Corrax不锈钢和ii)M789钢。这些合金是专门为激光粉床熔化(LPBF)工艺而设计的，该工艺结合了马氏体时效钢的印刷适宜性和众所周知的不锈钢的耐腐蚀性。奥伊斯塔尔平添加剂制造有限公司目前正在探索这些材料在模具和压铸行业中的潜在应用。为了确定可能从这些合金中受益的工业部件，必须确定这些材料在热处理后的组织行为和机械性能。 提出了热力学模拟和实验相结合的方法来确定这些合金的最佳后处理工艺。第一阶段包括使用热力学软件模拟不同温度和冷却速度下的相组成。在此活动之后将进行热处理实验，包括固溶和时效热处理，以及在第二阶段中使用X射线衍射(XRD)和电子背散射衍射(EBSD)技术进行的物相分析。其想法是在最大限度提高强度的同时避免形成可能损害模具寿命的残余奥氏体。一旦确定了最佳的后处理技术，在第三阶段，将进行拉伸、疲劳和冲击等机械试验，以确定合适的应用。这项工作的成果将有助于VAMC在加拿大模具和压铸行业持续可持续发展的合金开发方面的研究和开发活动。

The proposed project deals with materials characterization of two new commercial alloys: i) Corrax stainless steel and ii) M789 steel. These alloys are specifically designed to be employed in the laser powder bed fusion (LPBF) process, which combines the printability of maraging steel and the well-known corrosion resistance of stainless steel. Voestalpine Additive Manufacturing Ltd is currently exploring potential applications of these materials in tooling and die cast industries. To determine the industrial parts that may benefit from these alloys, the microstructural behavior and mechanical properties of these materials after heat treatment must be determined. A combination of thermodynamic simulation and experimental work is proposed to identify these alloys' optimum post-processing heat treatment. Phase 1 involves a simulation of phase fractions at various temperatures and cooling rates using thermodynamic software. This activity will be followed by the heat treatment experiments, consisting of solutionizing and aging heat treatment, coupled with phase analysis using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) techniques in Phase 2. The idea is to maximize strength while avoiding the formation of retained austenite that can be detrimental to die life. Once the optimum post-processing technique has been determined, in Phase 3, mechanical tests such as tensile, fatigue, and impact will be carried out to determine suitable applications. This work's output will assist the research and development activities of vAMC in alloy development for the Canadian tooling and die casting industries' continuous sustainability.