Authors:
Louis Becker (1), Felix Radtke (2), Jonathan Lentz (1), Simone Herzog (2), Christoph Broeckmann (2), Sebastian Weber (1)
1- Chair of Materials Technology (LWT), Bochum, Germany
2- Institute of Applied Powder Metallurgy and Ceramics (IAPK), Aachen, Germany
Abstract:
Laser Powder Bed Fusion/Metal (PBF-LB/M) shows great promise for industrial applications, but its extended production time remains a challenge. To address this, innovative methods such as the shell-core approach have been developed. In this procedure, a component is created with a dense outer shell surrounding a core of either unexposed or minimally exposed powder, drastically reducing processing time. Full densification and specific property adjustment are achieved by subsequent hot isostatic pressing (HIP). This study demonstrates the use of shell-core specimens made from a powder blend of austenitic stainless steel and Si3N4 to produce high-nitrogen steel components that are otherwise difficult to produce due to limited nitrogen solubility in the steel melt. During HIP, Si3N4 dissolves into the austenitic matrix, enriching it with nitrogen and circumventing solubility issues. This results in a material with increased strength and potentially improved corrosion resistance due to the beneficial impact of nitrogen on steel properties.
DOI:
https://doi.org/10.59499/EP246252913
