Effects of laser energy density on the resistance to wear and cavitation erosion of FeCrNiMnAl high entropy alloy coatings by laser cladding

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2024-11-02 DOI:10.1016/j.matchemphys.2024.130122

D.T. Yu , R. Wang , C.L. Wu , Z.Z. Wang , S. Zhang , C.H. Zhang , H.T. Chen , X.P. Tao

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Abstract

FeCrNiMnAl high entropy alloy (HEA) coatings are prepared on the surface of 304 stainless steel (304 SS) by laser cladding. The effects of laser energy density on the residual stress, microstructure, nanoindentation behavior, the resistance to wear, corrosion and cavitation erosion (CE) of FeCrNiMnAl HEA coatings are studied. Experimental results shows that when the laser energy density decreases from 40 J/mm² to 24 J/mm², the phase composition of the FeCrNiMnAl HEA coatings remains unchanged with a single BCC solid solution and the elements are uniformly distributed without obvious segregation. The average grain size of the HEA coatings is refined from 73.5 to 41.7 μm. When the laser energy density is 28 J/mm² for S3 sample, the coating displays good forming quality and excellent comprehensive performance. The specific wear rate is only 8.2 % that of the 304 SS substrate. In addition, S3 exhibits the highest corrosion resistance as indicated by the highest corrosion potential (E_corr) and the lowest corrosion current density (I_corr) in 3.5 wt% NaCl solution. After 10-h CE, the mean depth erosion rate (MDER) of S3 is the lowest (1.69 ± 0.03 μm/h), which is much lower than that of 304 SS (4.96 ± 0.13 μm/h), and the pure mechanical damage plays a dominant role in CE, followed by the synergistic damage effect. The excellent CE resistance of S3 is attributed to its excellent combination of corrosion resistance, mechanical properties and the self-recovery ability of passivation film.

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激光能量密度对激光熔覆法铁铬镍锰铝高熵合金涂层抗磨损和抗气蚀性能的影响

通过激光熔覆在 304 不锈钢（304 SS）表面制备了铁铬镍锰铝高熵合金（HEA）涂层。研究了激光能量密度对铁铬镍锰铝高熵合金涂层的残余应力、微观结构、纳米压痕行为、抗磨损性、抗腐蚀性和气蚀性（CE）的影响。实验结果表明，当激光能量密度从 40 J/mm2 降低到 24 J/mm2 时，FeCrNiMnAl HEA 涂层的相组成保持不变，为单一 BCC 固溶体，元素分布均匀，无明显偏析。HEA 涂层的平均晶粒尺寸从 73.5 微米细化到 41.7 微米。当 S3 样品的激光能量密度为 28 J/mm2 时，涂层显示出良好的成型质量和优异的综合性能。比磨损率仅为 304 SS 基材的 8.2%。此外，在 3.5 wt% 的 NaCl 溶液中，S3 具有最高的腐蚀电位（Ecorr）和最低的腐蚀电流密度（Icorr），显示出最高的耐腐蚀性。10 h CE 后，S3 的平均深度侵蚀速率（MDER）最低（1.69 ± 0.03 μm/h），远低于 304 SS（4.96 ± 0.13 μm/h），纯机械损伤在 CE 中起主导作用，其次是协同损伤效应。S3 优异的抗 CE 性能得益于其出色的耐腐蚀性能、机械性能和钝化膜自恢复能力。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.