Laser-treatment-induced surface integrity modifications of stainless steel

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Laser-treatment-induced surface integrity modifications of stainless steel
Title:
Laser-treatment-induced surface integrity modifications of stainless steel
Journal Title:
Materials Research Express
Keywords:
Publication Date:
23 February 2023
Citation:
Gong, N., Wei, Y., Meng, T. L., Karyappa, R., Cao, J., Tan, C. K. I., Suwardi, A., Zhu, Q., & Liu, H. (2023). Laser-treatment-induced surface integrity modifications of stainless steel. Materials Research Express, 10(3), 034002. https://doi.org/10.1088/2053-1591/acbe93
Abstract:
AbstractScanning of a high-power laser beam on the surface of martensitic stainless steel (SS420) has been studied, addressing the effect of scanning rate V on integrity modifications in the near-surface regions. Structural, compositional, and crystallographic characterizations revealed the presence of ablations, surface melting/resolidification, surface oxidations, and austenite (γ-phase) precipitations when V ≤ 20 mm s−1. Melt pool (MP), heat affected zone (HAZ), and base material have been clearly distinguished at the cross-section of the slow-scanned samples. Adjacent MPs partially overlapped when V = 5 mm s−1. Theγ-phase precipitations solely occurred in the MPs, i.e., of ∼ 400μm deep for V = 5 mm s−1, while oxidations dominantly occurred in the surface regions of shallower than ∼30μm within the MPs. Compositional analysis revealed increased Cr-, Mn-, and Si-to-Fe ratios at the laser-scanned surface but without variations along the surface normal direction. The enhanced surface hardness has been achieved up to 805 HV, and the hardness monotonically decreased when moving deeper (i.e., ∼1000μm) into the base material. These observations shed new light on surface engineering of metallic alloys via laser-based direct energy treatments.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research - RIE2020 advanced manufacturing and engineering (AME) programmatic grant - Structural Metal Alloys Programme
Grant Reference no. : A18B1b0061

This research / project is supported by the Agency for Science, Technology and Research - Industry Alignment Fund - Pre-Positioning
Grant Reference no. : A20 F9a0045
Description:
ISSN:
2053-1591