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Superior corrosion resistance-dependent laser energy density in (CoCrFeNi) 95 Nb 5 high entropy alloy coating fabricated by laser cladding
International Journal of Minerals, Metallurgy and Materials ( IF 5.6 ) Pub Date : 2021-05-06 , DOI: 10.1007/s12613-020-2238-2
Wen-rui Wang , Wu Qi , Xiao-li Zhang , Xiao Yang , Lu Xie , Dong-yue Li , Yong-hua Xiang

(CoCrFeNi)95Nb5 high entropy alloy (HEA) coatings were successfully fabricated on a substrate of Q235 steel by laser cladding technology. These (CoCrFeNi)95Nb5 HEA coatings possess excellent properties, particularly corrosion resistance, which is clearly superior to that of some typical bulk HEA and common engineering alloys. In order to obtain appropriate laser cladding preparation process parameters, the effects of laser energy density on the microstructure, microhardness, and corrosion resistance of (CoCrFeNi)95Nb5 HEA coating were closely studied. Results showed that as the laser energy density increases, precipitation of the Laves phase in (CoCrFeNi)95Nb5 HEA coating gradually decreases, and diffusion of the Fe element in the substrate intensifies, affecting the integrity of the (CoCrFeNi)95Nb5 HEA. This decreases the microhardness of (CoCrFeNi)95Nb5 HEA coatings. Moreover, the relative content of Cr2O3, Cr(OH)3, and Nb2O5 in the surface passive film of the coating decreases with increasing energy density, causing corrosion resistance to decrease. This study demonstrates the controllability of a high-performance HEA coating using laser cladding technology, which has significance for the laser cladding preparation of other CoCrFeNi-system HEA coatings.



中文翻译:

在通过激光熔覆制成的(CoCrFeNi)95 Nb 5高熵合金涂层中具有优异的耐蚀性相关的激光能量密度

通过激光熔覆技术成功地在Q235钢的基底上制备了(CoCrFeNi)95 Nb 5高熵合金(HEA)涂层。这些(CoCrFeNi)95 Nb 5 HEA涂层具有出色的性能,尤其是耐腐蚀性,这明显优于某些典型的体HEA和常见的工程合金。为了获得合适的激光熔覆制备工艺参数,仔细研究了激光能量密度对(CoCrFeNi)95 Nb 5 HEA涂层的组织,显微硬度和耐蚀性的影响。结果表明,随着激光能量密度的增加,(CoCrFeNi)95中的Laves相析出Nb 5 HEA涂层逐渐减少,基材中Fe元素的扩散加剧,影响(CoCrFeNi)95 Nb 5 HEA的完整性。这降低了(CoCrFeNi)95 Nb 5 HEA涂层的显微硬度。此外,Cr 2 O 3,Cr(OH)3和Nb 2 O 5的相对含量随着能量密度的增加,涂层表面钝化膜中的Al 2 O 3降低,导致耐蚀性降低。这项研究证明了使用激光熔覆技术的高性能HEA涂层的可控性,这对于其他CoCrFeNi系统HEA涂层的激光熔覆制备具有重要意义。

更新日期:2021-05-07
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