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Behzad Parvaresh,Reza Salehan,Reza Miresmaeili 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
Wire arc additive manufacturing (WAAM) has several industrial applications because of its advantages over other additivemanufacturing methods. In this study, two stainless steel 347 walls, namely as-deposited (AD) wall, and inter-layer coldworked (CW) wall, were prepared using the WAAM method to investigate the isotropy of their mechanical properties andwear properties in vertical and horizontal directions. For the AD wall, the mean yield strength, ultimate strength, and elongationof horizontal samples were 410 MPa, 620 MPa, and 47%, respectively. In comparison, these values for the vertical (V)samples were 402 MPa, 590 MPa, and 49%, respectively. For the CW wall, the mean yield strength, ultimate strength, andelongation of horizontal samples were 815 MPa, 876 MPa, and 26%, respectively, while those of vertical samples were 722MPa, 824 MPa, and 25%, respectively. The CW wall’s tensile test results indicated that inter-layer cold working intensifiedthe anisotropy of tensile properties in both vertical and horizontal directions. Microstructural investigation revealed thatinter-layer cold working and the heat resulted from subsequent layers deposition in the CW wall recrystallized the layersand reduced the grain size. Additionally, wear test results demonstrated that inter-layer cold working increased hardness andthus wear-resistance of the samples and reduced their friction. The results showed that the coefficient of friction (COF) andwear rates of the samples are not highly dependent on their direction.