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- Title
Laser Rescanning for Enhancing Mechanical Properties of Laser-Directed Energy-Deposited High-Manganese Steels.
- Authors
Park, Young Keun; Nam, Hyun Ji; Park, Yong Ho; Lee, Wookjin
- Abstract
This study investigates the effects of laser deposition and laser rescanning (LR) on the microstructure and mechanical properties of high-manganese steel (HMnS) deposited by laser-directed energy deposition (L-DED) comprising 24 wt.% Mn. Four types of laser deposition and LR strategies were investigated: unidirectional L-DED scanning without laser rescanning, L-DED scanning with 90° alterations in the laser scanning path on each layer without laser rescanning, unidirectional L-DED with laser rescanning in the same direction, and L-DED with laser rescanning with 90° alterations in the laser scanning path. The L-DED-processed HMnS had only a few small pores and exhibited a microstructure without any serious defects such as cracks. Additionally, a strong fibrous texture along the <101>/building direction of the fully austenite phase was found. The mechanical properties (microhardness and tensile strength) of HMnS were improved by the LR with a grain refinement effect and fine solidification cell size due to the significantly faster solidification rate in LR than that in L-DED.
- Subjects
LASERS; LASER deposition; GRAIN refinement; STEEL; CELL size; TENSILE strength; LASER weapons
- Publication
Micromachines, 2024, Vol 15, Issue 2, p176
- ISSN
2072-666X
- Publication type
Article
- DOI
10.3390/mi15020176