Compositional Optimization of In718 Superalloy Powder for Additive Manufacturing

E-ISSN： 1662-9752|2018|941|2167-2172

ISSN： 0255-5476

Source： Materials Science Forum, Vol.2018, Iss.941, 2019-01, pp. : 2167-2172

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Abstract

In this research, a composition optimized In718 superalloy powder suitable for additive manufacturing has been developed by using the vacuum induction melting gas atomization (VIGA) and the powder sieving process. VIGA which combines the vacuum induction melting (VIM) and gas atomization (GA) processes uses high pressure inert gas to atomize the metal melt formed by VIM to form metal droplets. These metal droplets are solidified to form metal powders during the falling process in the atomized chamber. After the sieving process, the mean particle size D₅₀ of the powder is less than 35 μm and the particle size distribution (PSD) ranges from 10 to 55 μm (D₁₀~D₉₀). Besides, the produced powder has high flowability (I_C_arr ≦15), which is suitable for selective laser melting (SLM) additive manufacturing (AM). After the SLM process, the tensile tests are conducted at room temperature and high temperature of 650°C. The results show that the high temperature properties of the optimized In718 superalloy are superior to the commercial In718 superalloy.