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Li R.,Huazhong University of Science and Technology | Liu J.,Heilongjiang Institute of Science and Technology | Shi Y.,Huazhong University of Science and Technology | Du M.,Shichuan Petroleum Perforating Materials Ltd | Xie Z.,Shichuan Petroleum Perforating Materials Ltd
Journal of Materials Engineering and Performance | Year: 2010

To fabricate 316L stainless steel part with a pore gradient structure, the method using selective laser melting (SLM) technique is exploited. Scan tracks feature, densification, and tensile property of SLMproduced samples prepared via different scan speeds were investigated. The results show that the porosity is strongly influenced by scan speed. On this basis, a gradient changed scan speed was applied in every SLM layer for the purpose of producing a gradient porosity metal. The results indicate that the structure exhibits a gradually increased porosity and a reduced molten pool size along the gradient direction of scan speed variation. The forming mechanisms for the gradient porosity were also addressed. © ASM International.


Li R.,Huazhong University of Science and Technology | Shi Y.,Huazhong University of Science and Technology | Liu J.,Heilongjiang Institute of Science and Technology | Du M.,Shichuan Petroleum Perforating Materials Ltd | Xie Z.,Shichuan Petroleum Perforating Materials Ltd
Advances in Systems Science and Applications | Year: 2012

316L stainless steel parts were manufactured via selective laser melting in this work. The surface morphology, microstructure, density and mechanical property were characterized. It is found that the surface contains a little amount of oxide and splash with balling effect. Microstructure in low magnification shows features of scan molten tracks and molten pools; microstructure in high magnification depicts very fine crystal under rapid cooling. The tensile strength of as-received samples is 652.12 MPa, with a density of 95.6%. Therefore the gas atomized 316L stainless steel powders could be used in manufacturing high quality parts with complex shapes via selective laser melting method.

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