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Chunliang Kuo,Pinxian Ye,Jhihjie Liu 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.4
This work outlines advances in material savings on lightweight structure when using additive manufacturing technology in conjunction with laser melting for joining and strengthening of layered Ti-6Al-4V composite powders on commercially pure Ti substrates. The migration of the extrinsic elemental alloys in the titanium composite powders strengthens the matrix structure, particularly in the heat affected zone beneath the joining surface. In the analysis of the main effect and variance (ANOVA), the optimised operating parameters for preferable energy density could increase the elemental migration (aluminium: ~ 3.63 at%, vanadium: ~ 3.31 at%) with appreciable penetration depth, high microhardness (> 440 HV 0.3 ) and a strengthened microstructure. In the confrmation tests, high tensile strength was achieved (1119.2 MPa) with high microhardness (> 440 HV 0.3 ) through the strengthening effects produced by the proper elemental migration under the application of high energy density (> 650 kW/mm 3 ). The composite structure of the lamellar microstructure and phase transformation induced by the Al and V elements spreading into the α-titanium matrix in the substrate are presented and discussed in the variety of parameter combinations.