316L Stainless Steel with Gradient Porosity Fabricated by Selective Laser Melting
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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 SLM-produced 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.
Keywordspore gradient selective laser melting 316L stainless steel
The authors gratefully appreciate the financial supports from the National High-Tech Program (863) of China (2007AA03Z115), Independent fund of State Key Laboratory of Material Processing and Die & Mould Technology of Huazhong University of Science & Technology (HUST) and Open fund of State Key Laboratory of Powder Metallurgy of Central South University (2008112022). The authors also thank the Analytic and Testing Center of HUST.
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