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      저자 : Y. J. Fang(방영젠) (검색결과 1 건)
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      • Novel Austenitic Stainless Steel with Advanced Mechanical Properties Fabricated by Selective Laser Melting of Powder Mixture of Austenitic and Ferritic Stainless Steels

        Y. J. Fang(방영젠),J. Suhr(서종환) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월

        With the help of selective laser melting (SLM) technique, austenitic stainless steels (SSs) with excellent strength and ductility have been successfully fabricated. However, the variety of SLM-fabricated austenitic SSs is limited. To develop more cost-effective SLM-fabricated austenitic SSs, a novel austenitic SS was successfully fabricated by SLM of a powder mixture composed of austenitic and ferritic SS powders, and the effect of laser energy density on the microstructure and mechanical properties of materials was investigated. At lowest energy density value (62.5 J/㎣), the phenomenon of lack of fusion was found and there were lots of ferrite with circular flow feature. With the increase of energy density, the porosity of materials was gradually decreased and the strength and elongation of materials were effectively increased. However, when energy density was highest (113.6 J/㎣), the occurrence of big keyhole pores severely weakened the tensile property of material. When an appropriate energy density was applied (89.3 J/㎣), sample displayed optimum ultimate tensile strength (675±4 MPa) and elongation (45.4±0.8%), which was mainly attributed to the formation of fine sub-grains. In addition, high strength could be attributed to formation of low-angle grain boundaries and dislocations, and low porosity of material.

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