Abstract
Laser additive manufacturing (LAM) is promising for fabricating multi-metallic component, but the mechanism of microstructural evolution at the interface of two metals is still needed to research further. In this study, a 316L stainless steel/Ti6Al4V alloy multi-metal was fabricated by LAM, and the mechanism of intermetallic phase transformation was deeply investigated. Results show that a strong reaction zone (SRZ) can be induced at the interface of the multi-metal. The phase constituents at the SRZ vary from χ (Ti5Fe17Cr5) + Fe2Ti + α′-Ti + β-Ti or FeTi to Fe2Ti + χ when the laser power is increased. When the scanning speed is further decreased, the thickness of the SRZ is significantly increased, and α′-Ti phase is also formed at this region besides Fe2Ti and χ phases. Moreover, the micro-hardness at the SRZ is increased, caused by the intermetallic phase transformation and elemental interdiffusion at the interface.
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Acknowledgements
This work was financially supported by the Key Research and Develop Program of Anhui Province (No. 202004b11020030), and the China Postdoctoral Science Foundation (No. 2020M680292).
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Yang, J., Li, X., Yao, H. et al. Interfacial Features of Stainless Steel/Titanium Alloy Multi-metal Fabricated by Laser Additive Manufacturing. Acta Metall. Sin. (Engl. Lett.) 35, 1357–1364 (2022). https://doi.org/10.1007/s40195-022-01384-9
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DOI: https://doi.org/10.1007/s40195-022-01384-9