[T6] AM Beam Based Technologies

[15B-T6-15] Development of High Silicon Stainless Steel by Laser Powder Bed Fusion

*K. Doi¹, N. Nishi¹, Y. Miyazaki¹, M. Ito¹, N. Aoe², T. Shimizu³, H. Shimizu³, A. Nishimoto², S. Terauchi¹ (1.Osaka Yakin Kogyo Co., Ltd., Japan, 2.Kansai University, Japan, 3.Japan Silicolloy Industry Co., Ltd., Japan)

Keywords:additive manufacturing, laser powder bed fusion, precipitation-hardening stainless steel, silicon

Forgings and castings of high-silicon stainless steel have already been used in practical applications. However, high-silicon stainless steel components manufactured using powder metallurgy processes have not been used practically yet. In this study, laser powder bed fusion (L-PBF) was applied to precipitation-hardening stainless steel containing 3.5% silicon. A process window and optimal printing conditions for high-silicon stainless steel using L-PBF were determined. Samples with relative densities of 99% or higher were fabricated using L-PBF. Furthermore, the effects of the heat treatment on the mechanical properties of the samples were studied. This study obtained the aged samples with a hardness equivalent to conventional forgings.