{"title":"激光熔覆制备的 CoCrFexNi (x = 0, 1) 中熵合金涂层的微观结构和磨损性能","authors":"Yinghu Wang, Zhiyuan Wang, Jianyan Xu","doi":"10.1108/ilt-04-2024-0116","DOIUrl":null,"url":null,"abstract":"<h3>Purpose</h3>\n<p>High-nitrogen steel is a common material for the manufacture of drilling equipment such as drill collars. However, its poor surface properties often limit its applications. The purpose of this paper is to find a way to enhance the surface performance of high-nitrogen steel, which is expected to improve the wear resistance of high-nitrogen steel.</p><!--/ Abstract__block -->\n<h3>Design/methodology/approach</h3>\n<p>The CoCrNi and CoCrFeNi medium-entropy alloy (MEA) coatings were prepared on high-nitrogen steel substrate by laser cladding technology. The microstructure, phase composition and element distribution of the fabricated coatings were investigated using scanning electronic microscopy, electron backscatter diffraction and X-ray diffraction. The phase structure, phase stability and structural stability of the CoCrNi and CoCrFeNi MEAs were investigated in combination with phase diagram calculation and molecular dynamics. Then the wear tests were carried out for coatings.</p><!--/ Abstract__block -->\n<h3>Findings</h3>\n<p>The results show that both prepared MEA coatings have good quality and contain a single face-centered cubic phase. The wear performance of MEA coatings is improved by the refinement of grain size and the increase of dislocation density. Due to the addition of Fe atoms, the lattice distortion of the CoCrFeNi system increased, resulting in a higher dislocation density of the coating. Cr atoms in the CoCrFeNi system are the largest, and the local lattice distortions induced by them are greater. 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引用次数: 0
摘要
用途高氮钢是制造钻铤等钻探设备的常用材料。但其较差的表面性能往往限制了其应用。设计/方法/途径 通过激光熔覆技术在高氮钢基体上制备了 CoCrNi 和 CoCrFeNi 中熵合金 (MEA) 涂层。利用扫描电子显微镜、电子反向散射衍射和 X 射线衍射研究了所制备涂层的微观结构、相组成和元素分布。结合相图计算和分子动力学研究了钴铬镍和钴铬铁镍 MEA 的相结构、相稳定性和结构稳定性。结果表明，制备的两种 MEA 涂层质量良好，均含有单面心立方相。通过细化晶粒尺寸和增加位错密度，MEA 涂层的磨损性能得到了改善。由于添加了铁原子，CoCrFeNi 系统的晶格畸变增加，导致涂层的位错密度提高。CoCrFeNi 系统中的铬原子最大，其引起的局部晶格畸变也更大。原创性/价值首次在高氮钢表面成功制备了无明显缺陷的钴铁镍和钴铬镍 MEA 涂层。详细讨论了不同涂层的微观形貌和晶粒取向。通过实验和分子动力学模拟说明了涂层的硬度增强机理和结构稳定性。同行评议本文的同行评议记录见：https://publons.com/publon/10.1108/ILT-04-2024-0116/。
Microstructures and wear properties of CoCrFexNi (x = 0, 1) medium-entropy alloy coatings prepared by laser cladding
Purpose
High-nitrogen steel is a common material for the manufacture of drilling equipment such as drill collars. However, its poor surface properties often limit its applications. The purpose of this paper is to find a way to enhance the surface performance of high-nitrogen steel, which is expected to improve the wear resistance of high-nitrogen steel.
Design/methodology/approach
The CoCrNi and CoCrFeNi medium-entropy alloy (MEA) coatings were prepared on high-nitrogen steel substrate by laser cladding technology. The microstructure, phase composition and element distribution of the fabricated coatings were investigated using scanning electronic microscopy, electron backscatter diffraction and X-ray diffraction. The phase structure, phase stability and structural stability of the CoCrNi and CoCrFeNi MEAs were investigated in combination with phase diagram calculation and molecular dynamics. Then the wear tests were carried out for coatings.
Findings
The results show that both prepared MEA coatings have good quality and contain a single face-centered cubic phase. The wear performance of MEA coatings is improved by the refinement of grain size and the increase of dislocation density. Due to the addition of Fe atoms, the lattice distortion of the CoCrFeNi system increased, resulting in a higher dislocation density of the coating. Cr atoms in the CoCrFeNi system are the largest, and the local lattice distortions induced by them are greater. Through this study, MEA coatings with high hardness can be expanded to drilling field applications.
Originality/value
CoCrFeNi and CoCrNi MEA coatings were successfully prepared on the surface of high-nitrogen steel for the first time without obvious defects. The micromorphology and grain orientation of the different kinds of coatings were discussed in detail. The hardness-strengthening mechanism and structure stability of the coatings were illustrated by experiments and molecular dynamics simulations.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2024-0116/
期刊介绍：
Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.
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