This study examines the impact of thermal post processing, specifically induction hardening and tempering, on the fatigue performance of laser powder bed fusion (PBF-LB) manufactured AISI 4140 steel. Results highlight the importance of porosity control, with induction hardening effectively addressing near-surface porosity issues in non-machined parts.

compressive residual stress, fatigue properties, induction surface hardening, laser powder bed fusion, low-alloy steel, microstructure, porosity, tempered martensite embrittlement, tempering, Vickers hardness
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2025
ASM International
Topics
Microstructure Tempered martensite embrittlement Low-alloy steel Powder bed fusion Surface hardening Induction surface hardening Fatigue properties Hardness Porosity Proeutectoid ferrite
Issue Section:
Residual Stress Process Methodology