金绍彤,杜晓东,钟一鸣,吴刚.送粉方式对WC 颗粒增强铁基熔覆层的影响[J].表面技术,2016,45(10):96-102.
JIN Shao-tong,DU Xiao-dong,ZHONG Yi-ming,WU Gang.Influence of Powder-Feeding Mode on Microstructure of WC Particles-Reinforced Fe-based Cladding Layer[J].Surface Technology,2016,45(10):96-102 |
| 送粉方式对WC 颗粒增强铁基熔覆层的影响 |
| Influence of Powder-Feeding Mode on Microstructure of WC Particles-Reinforced Fe-based Cladding Layer |
| 投稿时间：2016-05-28 修订日期：2016-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.10.015 |
| 中文关键词: 等离子喷焊 改进后送粉方式 WC 颗粒增强 WC 分布 粉末利用率 显微组织 |
| 英文关键词:plasma spray welding improved back powder-feeding mode WC particles-reinforced distribution of WC utilization ratio of powder microstructure |
| 基金项目: |
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| Author | Institution |
| JIN Shao-tong | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
| DU Xiao-dong | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
| ZHONG Yi-ming | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
| WU Gang | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
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| 中文摘要: |
| 目的 改进后送粉方式在45#钢表面利用等离子喷焊技术制备WC 颗粒增强铁基耐磨熔覆层。方法 利用等离子喷焊机和加装改进的后送粉装置制备熔覆层，通过金相光学显微镜（OM）、扫描电子显微镜（SEM）、能谱仪（EDS）和X 射线衍射（XRD）等测试分析手段研究熔覆层的显微组织、相组成和成分特征。结果 后送粉电压和送粉方式对WC 颗粒分布的影响较大，通过调整送粉电压、改进后送粉方式可以改善WC 的分布以及WC 粉末的利用率。球形铸造WC 与多边形结晶WC 相比，前者粉末利用率显著提高，WC 颗粒分布更均匀，熔覆层的平均维氏硬度达到1500HV10 以上，高于后者。熔覆层出现鱼骨状莱氏体组织和大量的碳化物。结论 改进的后送粉方式包含了同步送粉和后送粉的优点，使WC 颗粒分布均匀，且WC 未出现很大程度溶解，保留原始形态。送粉电压为10 V 时，后送粉的熔覆效果较好。球形铸造WC 增强熔覆层的性能较多边形结晶WC 有很大提高。 |
| 英文摘要: |
| The work aims to prepare WC particles-reinforced Fe-based wearproof cladding layer on the surface of 45# steel by plasma spray welding provided that back powder-feeding mode was improved. The cladding layer was prepared by plasma spray welding machine and improved back powder-feeding device. Test analysis methods including optical microscope (OM), scanning electronmicroscopy (SEM)，X-ray diffractometer (XRD) and energy dispersive spectrometer (EDS) were used to study microstructure, phase composition and chemical compositions of the cladding layer. Since the distribution of WC particles was mainly determined by back powder-feeding voltage and powder-feeding mode, the distribution of WC particles and utilization ratio of WC powder could be improved by adjusting the powder-feeding voltage and improving back powder-feeding mode. Meanwhile, compared with spherical cast WC and polygonal crystal WC, utilization ratio of the former powder was increased obviously, WC particles were distributed more uniformly and average Vickers hardness of the cladding layer reached over 1500HV10, higher than the latter. Fishbone-like ledeburite structure and a mass of carbides were detected in the cladding layer subject to back-feeding spherical cast WC process. The improved back powder-feeding mode possesses the advantages of synchronous powder feeding and back feeding, providing uniform distribution of WC particles and retaining the original form without significant dissolution. Better cladding effects are made at powder-feeding voltage of 10 V. Spherical cast WC- reinforced cladding layer presents better performance than that of polygonal crystal WC. |
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