Simulation and experimental study of femtosecond laser ablation mechanisms of NiCoCrAlY coatings

IF 5.3 2区 材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131469
Yue Hu , Ruisong Jiang , Chongxiang Huang , Chaolang Chen , Shaojian Wang
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Abstract

To enhance the adhesion of turbine blade thermal barrier coating systems using the LST method, a thorough understanding of the ablation mechanism of NiCoCrAlY bond coat material by femtosecond laser systems is essential for producing high-quality textured grooves. This study systematically investigates the ablation mechanisms of NiCoCrAlY material, exploring the effects of laser energy density, laser scanning speed, and the number of laser scans on the ablation of NiCoCrAlY. Numerical simulations based on the two-temperature model were conducted, providing a comprehensive analysis of thermal effects, heat accumulation, and material response during the laser ablation process. The experimental results indicate that 1) the ablation phenomenon caused by heat accumulation becomes evident as the laser energy density increases from 1.948 J/cm2 to 4.521 J/cm2, with the accumulated heat reaching 1525.2 K, leading to distinct melting residues and heat-affected zones on the groove walls. 2) The change in laser scanning speed also affects heat accumulation. Using a laser scanning speed of 800 mm/s results in a high material removal rate, smooth machined walls, and a uniform surface with no significant heat-affected zones. 3) Excessively high numbers of laser scans shift the laser focus to the bottom of the groove. The high concentration of laser energy causes intense localized ablation, forming sharp bases with numerous cracks and melting residues. To achieve efficient and high-quality laser ablation, it is necessary to ensure that the number of scans remains below 40.
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飞秒激光烧蚀 NiCoCrAlY 涂层机理的模拟与实验研究
为了利用 LST 方法增强涡轮叶片隔热涂层系统的附着力,必须深入了解飞秒激光系统对 NiCoCrAlY 粘接涂层材料的烧蚀机理,以产生高质量的纹理沟槽。本研究系统地研究了 NiCoCrAlY 材料的烧蚀机制,探讨了激光能量密度、激光扫描速度和激光扫描次数对 NiCoCrAlY 烧蚀的影响。基于双温模型进行了数值模拟,全面分析了激光烧蚀过程中的热效应、热积累和材料响应。实验结果表明:1)当激光能量密度从 1.948 J/cm2 增加到 4.521 J/cm2 时,热积累引起的烧蚀现象变得明显,积累的热量达到 1525.2 K,导致沟槽壁上出现明显的熔化残留物和热影响区。2) 激光扫描速度的变化也会影响热量的积累。使用 800 mm/s 的激光扫描速度,材料去除率高,加工壁光滑,表面均匀,没有明显的热影响区。3) 激光扫描次数过多会使激光焦点偏移到沟槽底部。高浓度的激光能量会造成强烈的局部烧蚀,形成带有大量裂纹和熔化残留物的尖锐基底。要实现高效和高质量的激光烧蚀,必须确保扫描次数保持在 40 次以下。
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来源期刊
Surface & Coatings Technology
Surface & Coatings Technology 工程技术-材料科学:膜
CiteScore
10.00
自引率
11.10%
发文量
921
审稿时长
19 days
期刊介绍: Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.
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