[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 (L-PBF), Precipitation hardening stainless steel, Silicon

Casting and forging 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. The additive manufacturing process can be used for high- silicon stainless steel. In this study, laser powder bed fusion (L-PBF) was applied to precipitation hardening stainless steel containing 3.5% silicon. A process window for the high-silicon alloy via the L-PBF was proposed, and built objects with a relative density of 99% were fabricated. Furthermore, the effect of heat treatment on the mechanical properties of built objects was studied. As a result of this study, built objects with hardness equivalent to a conventional forged material were obtained using the heat treatment.