Microstructure and Wear Resistance of High-Melting-Point AlCrFeMoNbxTiW High-Entropy Alloy Coating by Laser Cladding

被引：0

作者：

Guo, Yaxiong ^{[1
]}

Liu, Qibin ^{[1
,2
]}

Zhou, Fang ^{[1
]}

机构：

[1] College of Materials and Metallurgy, Guizhou University, Guiyang,550025, China

[2] Guizhou Province Key Laboratory of Materials Structure and Strength, Guiyang,550025, China

来源：

Xiyou Jinshu/Chinese Journal of Rare Metals | 2017年 / 41卷 / 12期

关键词：

Niobium alloys - Coatings - High-entropy alloys - Melting point - Chromium alloys - Entropy - Friction - Microstructure - Scanning electron microscopy - Tool steel - Wear of materials - Carbides - Microhardness - X ray diffraction - Laser cladding - Niobium;

D O I：

10.13373/j.cnki.cjrm.XY16070014

中图分类号：

学科分类号：

摘要：

To improve the wear resistance of high speed cutting steel, AlCrFeMoNbxTiW high-entropy alloy with high melting point coatings were prepared by laser cladding on the tool steel. Optical microscope (OM), X-ray diffraction (XRD) and scanning electron microscope (SEM) (with energy dispersive spectrum (EDS)) were carried out to analyze microstructure of cladding layer, and micro-hardness and wear resistance were measured by micro hardness tester and the friction and wear tester. The experimental results indicated that the coating consisted of BCC phase, (Nb, Ti)C and Laves phases; while atom fraction of Nb content was 1, the microstructure of coating was cellular crystal and granular carbide (Nb, Ti)C. As further increase of Nb content, the microstructure transformed from radial eutectic to strip-like hypereutectic, moreover, the dispersive distribution of (Nb, Ti)C always existed in the coating. With the content of Nb increasing, the microhardness of coating increased and the highest microhardness reached HV0.2 1017 in Nb7. The wear experiment showed that average friction coefficient was little different from each Nbx coating. The wear loss decreased while Nb content increased. The worn morphology showed that abrasive wear was the main wear mechanism. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

引用

页码：1327 / 1332