Mechanical Behaviour of Maraging Steel Processed by Powder Bed Fusion via Laser Beam (PBF-LB) in Different Build Orientations

Abstract

Anisotropy in tensile behaviour, plastic flow behaviour, and low cycle fatigue (LCF) behaviour of additively manufactured (AM) maraging steel in different build orientations are presented and compared with conventionally manufactured maraging steel. Also, the effect of heat treatment (namely, solution treatment and ageing) on tensile behaviour and low-cycle fatigue behaviour were studied. The AM maraging steel showed more anisotropy in as-built (AB) condition and moderate anisotropy in heat-treated (HT) condition. Experimental engineering stress-engineering strain and true stress-true strain data of AB AM maraging steel and HT conditions have been analysed using Hollomon, Ludwik, Swift, Ludwigson, and Voce plastic flow relationships. It is also observed that the 0° oriented specimen exhibits better tensile and LCF behaviour as compared to the 90° oriented specimen in AB and HT conditions.