Development and characterization of Ti-6Al-4V to 304L stainless steel gradient components fabricated with laser deposition additive manufacturing

作者：Reichardt Ashley^*; Dillon R Peter; Borgonia John Paul; Shapiro Andrew A; McEnerney Bryan W; Momose Tatsuki; Hosemann Peter

来源：Materials and Design, 2016, 104: 404-413.

DOI：10.1016/j.matdes.2016.05.016

• Laser deposition
• Functionally graded
• Ti-alloy
• Stainless steel 304L
• Fe-V sigma phase

In this study, a multi-hopper laser deposition system is used to additively manufacture functionally graded Ti-6Al-4V to 304L stainless steel components with a vanadium interlayer. Grain morphology, phase, and composition are mapped along the component gradients with electron backscatter diffraction (EBSD) and energy dispersive X-ray spectroscopy (EDS), and mechanical property changes are assessed utilizing Vickers hardness and nanoindentation. Precipitation of brittle intermetallic compounds such as FeTi and the formation of an Fe-V-Cr sigma phase are confirmed to be the causes ofmid-fabrication cracking in the components. Guided by multicomponent phase diagrams, alternate paths in composition space are proposed to strategically avoid unfavorable phase formation along the gradient. Composition-dependent adjustment of process parameters is also proposed to reduce the prevalence of observed powder inclusions, homogenize grain morphology, and improve component mechanical properties.

• 出版日期2016-8-15