Study on Laser-Selective Melting Forming Process of 316L/IN718 Mixed Powder

Abstract

In order to obtain high-density 316L/IN718 mixed metal powder parts, the forming process of 316L/IN718 mixed metal powder was investigated by single fusion channel experiments, single layer experiments and block experiments, based on laser-selective melting (SLM) technology with different laser scanning speeds and scanning pitchs, respectively. Results showed that when 0.54 J/mm ≤ laser line energy density (L) ≤ 0.76 J/mm in a single melt experiment, the effect of melt forming is relatively good. When the laser power (P)=200 W, scanning speed (v) = 280 mm/s, and scanning pitch = 0.12 mm, the blocks with a density of 99.99% could be obtained. Besides, the laser energy density-relative density relationship was obtained by fitting. The process research presented application and promotion value, providing important experimental data and technical support for achieving forming gradient functional materials.

Keywords

• laser-selective melting|316/in718 gradient material|process parameters|density