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激光熔覆制备的铼掺杂镍铬镀层的微观结构

Microstructure of Rhenium Doped Ni-Cr Deposits Produced by Laser Cladding.

作者信息

Kołodziejczak Paweł, Golański Dariusz, Chmielewski Tomasz, Chmielewski Marcin

机构信息

Institute of Manufacturing Technologies, Warsaw University of Technology, Narbutta 85, 02-524 Warsaw, Poland.

Centre of Electronic Materials Technology, Łukasiewicz Research Network Institute of Microelectronics and Photonics, Wólczyńska 133, 01-919 Warsaw, Poland.

出版信息

Materials (Basel). 2021 May 22;14(11):2745. doi: 10.3390/ma14112745.

DOI:10.3390/ma14112745
PMID:34067488
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8197019/
Abstract

The addition of Rhenium up to 6% to Ni-Cr alloys can dramatically improve the corrosion and oxide resistance of deposited coatings at high operating temperatures. Ni-Cr+Re layers can be successfully produced using conventional powder metallurgy, high rate solidification (HRS), or magnetron sputtering methods. However, in industrial applications, high-performance deposition methods are needed, e.g., laser cladding. Laser cladding has several advantages, e.g., metallurgical bonding, narrow heat-affected zone (HAZ), low dilution, and slight thermal damage to the substrate. In this paper, a powder Ni-Cr composite with 1% (wt.) of Rhenium was produced, then deposited onto a steel substrate (16Mo3) by laser cladding to assess the micro and macrostructural properties of the obtained layers. Besides the macro and microscopic observations, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) microanalysis of the deposit and HAZ as well as microhardness measurements have been conducted. The microstructure observations revealed four subareas of HAZ gradually changing from the fusion line towards the base material. Maximum hardness occurred in the HAZ, mainly in areas closer to the clad/substrate interface, reaching up to 350-400 HV. No sudden changes in the composition of the deposit and the area of fusion line were observed.

摘要

在镍铬合金中添加高达6%的铼，可以显著提高沉积涂层在高温工作条件下的耐腐蚀性和抗氧化性。采用传统粉末冶金、高速凝固（HRS）或磁控溅射方法可以成功制备镍铬+铼层。然而，在工业应用中，需要高性能的沉积方法，例如激光熔覆。激光熔覆具有多种优点，例如冶金结合、热影响区（HAZ）窄、稀释率低以及对基体的热损伤小。本文制备了含1%（重量）铼的镍铬复合粉末，然后通过激光熔覆将其沉积在钢基体（16Mo3）上，以评估所得涂层的微观和宏观结构性能。除了宏观和微观观察外，还对熔覆层和热影响区进行了扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）微观分析以及显微硬度测量。微观结构观察发现，热影响区有四个子区域，从熔合线向基体材料逐渐变化。热影响区的硬度最高，主要在靠近熔覆层/基体界面的区域，可达350 - 400 HV。在熔覆层成分和熔合线区域未观察到突然变化。

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