Experimental study on microstructure of high-entropy alloy reinforced with ceramic particles formed by laser cladding

IF 4.4 3区工程技术 Q1 ENGINEERING, CIVIL

Archives of Civil and Mechanical Engineering Pub Date : 2024-10-26 DOI:10.1007/s43452-024-01069-3

Xue-Long Wen, Lin-Yuan Song, Wen-Bo Zhang, Ya-Dong Gong, Feng-Bing Han

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Abstract

The microstructure of SiC ceramic particle-reinforced FeCoNiCrAl high-entropy alloy specimens prepared by laser cladding was observed, and the effects of SiC and Al content and laser process parameters on the microstructure of laser cladding high-entropy alloy were analyzed. The results show that increasing the scanning speed and laser power or reducing the powder feeding rate is conducive to obtaining smaller grains and forming a denser microstructure. However, when the laser power and scanning speed are too large, pores and unmelted powder will appear. Increasing the content of SiC ceramic particles significantly increases the number of heterogeneous nucleation points, resulting in a decrease in the grain size in the cladding layer and a more tortuous grain boundary, which is conducive to improving comprehensive performance. However, when the SiC content is too high, defects, such as cracks and inclusions, are prone to occur. With the increase of Al content, the grain size in the cladding layer increases first and then decreases.

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激光熔覆陶瓷颗粒强化高熵合金微观结构的实验研究

观察了激光熔覆法制备的SiC陶瓷颗粒强化FeCoNiCrAl高熵合金试样的显微组织，分析了SiC和Al含量及激光工艺参数对激光熔覆高熵合金显微组织的影响。结果表明，提高扫描速度和激光功率或降低送粉速度有利于获得更小的晶粒并形成更致密的微观结构。但是，当激光功率和扫描速度过大时，会出现气孔和未熔化的粉末。增加 SiC 陶瓷颗粒的含量可显著增加异质成核点的数量，从而使包覆层的晶粒尺寸减小，晶界更加曲折，有利于提高综合性能。但是，当 SiC 含量过高时，容易产生裂纹和夹杂物等缺陷。随着 Al 含量的增加，包覆层的晶粒尺寸先增大后减小。

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来源期刊

Archives of Civil and Mechanical Engineering 工程技术-材料科学：综合

CiteScore

6.80

自引率

9.10%

发文量

201

审稿时长

4 months

期刊介绍： Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science. The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics. The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation. In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.