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      저자 : Behzad Parvaresh (검색결과 2 건)
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        Investigating Isotropy of Mechanical and Wear Properties in As-Deposited and Inter-Layer Cold Worked Specimens Manufactured by Wire Arc Additive Manufacturing

        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.

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        Ancillary Processes for High-Quality Additive Manufacturing: A Review of Microstructure and Mechanical Properties Improvement

        Behzad Parvaresh,Hossein Aliyari,Reza Miresmaeili,Mina Dehghan,Mohsen Mohammadi 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11

        Metal additive manufacturing is a method of producing metallic parts layer-by-layer. Some drawbacks, including anisotropyin mechanical properties, detrimental residual stresses, and the presence of columnar grain structures can affect the qualityand performance of additively manufactured metallic parts. Therefore, different industrial sectors have employed intuitiveancillary processes to improve the quality of additively manufactured parts. Of particular interest is in-situ ancillary processesthat are more applicable than other procedures due to their utmost importance to reduce manufacturing cycle time. In thisreview article, after introducing various metal additive manufacturing technologies, some of the common alloys utilized inthose processes were discussed. With an eye toward improving the quality of additively manufactured components, the focusof the review was then shifted toward the effects of building direction, processing parameters, and Alloying compositionModification on microstructure and mechanical properties. The efficacy of ancillary processes such as metalworking, in-situheat treatment, and in-situ thermo hydrogen process in reducing defects and improving physical and mechanical propertieswas then presented.

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