Investigating the Effect of Nanosecond Laser Surface Texturing on Microstructure and Mechanical Properties of AISI 301LN

IF 2.6 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals Pub Date : 2023-12-17 DOI:10.3390/met13122021
Mohammad Rezayat, Hossein Besharatloo, Antonio Mateo
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Abstract

This study explores pulsed Nd:YLF laser surface modification (LSM) effects on AISI 301LN stainless steel. Laser-treated surfaces underwent SEM characterization, revealing patterns and irregularities. Higher heat input surfaces showed significant microstructural changes, while lower heat input surfaces experienced less alteration. Increased laser spot overlap led to larger exposed areas and higher heat input, influencing groove width, depth, and surface roughness. Three-dimensional reconstructions illustrated the correlation between laser parameters and surface characteristics. XRD (X-Ray diffraction analysis) and EBSD (Electron backscatter diffraction) analyses revealed a transformation from austenite to martensite, with an increase in the α’-martensite phase, particularly in patterns with high laser power, attributed to rapid cooling during laser modification. Grain size analysis indicated a 42% reduction post-treatment, enhancing the surface fraction of fine grains. Hardness measurements demonstrated an overall increase in laser-treated samples, linked to fine-grained microstructure formation, induced residual stresses, and the α’-martensitic phase.
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研究纳秒激光表面纹理对 AISI 301LN 显微结构和机械性能的影响
本研究探讨了脉冲 Nd:YLF 激光表面改性 (LSM) 对 AISI 301LN 不锈钢的影响。激光处理过的表面经过 SEM 表征,显示出图案和不规则性。热输入较高的表面显示出显著的微观结构变化,而热输入较低的表面则变化较小。激光光斑重叠的增加导致暴露面积增大,热输入增加,从而影响沟槽宽度、深度和表面粗糙度。三维重建说明了激光参数与表面特征之间的相关性。XRD(X 射线衍射分析)和 EBSD(电子反向散射衍射)分析表明,奥氏体向马氏体转变,α'-马氏体相增加,特别是在激光功率较高的模式中,这归因于激光改性过程中的快速冷却。晶粒大小分析表明,处理后晶粒大小减少了 42%,细晶粒的表面分数增加了。硬度测量结果表明,经过激光处理的样品硬度总体上有所提高,这与细晶粒微结构的形成、诱导残余应力和α'-马氏体相有关。
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来源期刊
Metals
Metals MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING
CiteScore
4.90
自引率
13.80%
发文量
1832
审稿时长
1.5 months
期刊介绍: Metals (ISSN 2075-4701) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Metals provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of metals.
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