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Studies on Microstructure, Microhardness and Wear Behavior of L-PBFed 18Ni(300) Maraging Steel Part: Effect of Post-Heat Treatment
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Author(s): Sudipta Swain (National Institute of Technology, Rourkela, India), Tanushree Sahoo (National Institute of Technology, Rourkela, India), Saurav Datta (National Institute of Technology, Rourkela, India), Kaushik Kumar (Birla Institute of Technology, India)and Tarapada Roy (National Institute of Technology, Rourkela, India)
Copyright: 2026
Pages: 24
Source title:
Innovative Welding Methods for Modern Manufacturing
Source Author(s)/Editor(s): Romdhane Ben Khalifa (National Engineering School of Gabes, University of Gabes, Tunisia)
DOI: 10.4018/979-8-3373-1797-7.ch006
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Abstract
This study explores the fabrication of Maraging Steel 18Ni(300) using Laser-Powder Bed Fusion (L-PBF) and examines its microstructural evolution, microhardness, and dry sliding wear behavior before and after post-heat treatment. The heat treatment includes solution treatment (ST) at 840 °C for 2 h followed by oil quenching, then ageing (AT) at 492 °C for 2 h with final oil quenching. The as-built L-PBF specimen exhibits a fine microstructure with columnar dendritic grains and cellular lattice morphologies due to high undercooling. Nital etching reveals fish-scale-shaped Melt Pool Boundaries (MPBs), while Fry's reagent highlights martensitic morphology. Solution annealing dissolves micro-segregation, enhancing precipitate formation during ageing, which strengthens the material. Microhardness increases from ~397 ± 14.1 HV0.5 (as-built) to ~587 ± 13.5 HV0.5 (aged). XRD confirms retained austenite in the as-built and martensite in the heat-treated specimen. The post-heat-treated specimen also exhibits lower wear rates.
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