Effect of multiple laser remelting on microstructure and corrosion resistance of Fe0.5CoCrNi1.5Nb0.68Mo0.3 high entropy alloy coatings

Yongfeng Li, Lixia Wang, Jian Zhang, Meiqin Liu, Shenggang Guo, Jing Liu, Lili Cao
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Abstract

High entropy alloy (HEA) coatings of FeCoCrNiNbMo was prepared on 304 stainless steel using laser cladding and subsequently remelted multiple times. The effects of multiple thermal cycles on the phase composition, grain size, microstructure evolution, and corrosion resistance of the coatings are thoroughly investigated. The original coating consisted of face-centered cubic (FCC), Laves, and NbC phases, and the phase composition does not change obviously, but the distribution and microstructure of the phase change significantly after multiple remelting. As the number of remelting times increased, the bar-like eutectic structure decreased while the lamellar eutectic structure became more prominent. Laser remelting induced dynamic recrystallization in the coating, resulting in a transformation from columnar grains to equiaxed grains, and then back to columnar grains. The grain size also changes significantly with different remelting times. Potentiodynamic polarization and electrochemical impact spectroscopy measurements were conducted in a 3.5 wt% NaCl solution to evaluate the corrosion resistance of the coating. The results revealed both the original coating and the once-remelted coating exhibited lower corrosion current density and higher corrosion potential, but the latter had a higher Faraday impedance. Additionally, immersion tests were performed in 10 wt% FeCl solution, which demonstrated that the once-remelted coating displayed fine and uniform corrosion pits with shallow depth. This study provides theoretical support for the regulation of microstructure and the optimization of coating performance. Furthermore, the microstructure evolution law discovered in this research is also applicable to additive manufacturing.
多次激光重熔对 Fe0.5CoCrNi1.5Nb0.68Mo0.3 高熵合金涂层微观结构和耐腐蚀性的影响
利用激光熔覆技术在 304 不锈钢上制备了铁钴铬镍铌钼高熵合金 (HEA) 涂层,随后进行了多次重熔。本文深入研究了多次热循环对涂层的相组成、晶粒大小、微观结构演变和耐腐蚀性的影响。原始涂层由面心立方(FCC)、Laves 和 NbC 相组成,相组成没有明显变化,但多次重熔后相的分布和微观结构发生了显著变化。随着重熔次数的增加,棒状共晶结构减少,而片状共晶结构更加突出。激光重熔诱导涂层发生动态再结晶,导致柱状晶粒转变为等轴晶粒,然后又变回柱状晶粒。随着重熔时间的不同,晶粒大小也发生了明显的变化。在 3.5 wt% 的氯化钠溶液中进行了电位极化和电化学冲击光谱测量,以评估涂层的耐腐蚀性。结果表明,原始涂层和重熔后的涂层都表现出较低的腐蚀电流密度和较高的腐蚀电位,但后者的法拉第阻抗更高。此外,还在 10 wt% 的氯化铁溶液中进行了浸泡试验,结果表明,经过一次修磨的涂层显示出细小均匀、深度较浅的腐蚀坑。这项研究为微观结构的调节和涂层性能的优化提供了理论支持。此外,该研究发现的微观结构演变规律也适用于快速成型制造。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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