芦海俊,水剑虹,王锴,尚勇,姜海峰,魏金.WC颗粒熔解析出对Ni60熔覆层性能的影响[J].表面技术,2023,52(3):189-196.
LU Hai-jun,SHUI Jian-hong,WANG Kai,SHANG Yong,JIANG Hai-feng,WEI Jin.Effects of Dissolving and Precipitating of WC Particles on Performance of Ni60 Coating[J].Surface Technology,2023,52(3):189-196 |
| WC颗粒熔解析出对Ni60熔覆层性能的影响 |
| Effects of Dissolving and Precipitating of WC Particles on Performance of Ni60 Coating |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.016 |
| 中文关键词: WC Ni60 抗剪强度 磨粒磨损 熔覆电流 |
| 英文关键词:WC Ni60 shear strength abrasive wear cladding current |
| 基金项目:河南省科技攻关重点项目(202102210210);中铁高新工业股份有限公司科技开发计划(2021?10);中铁工程装备集团隧道设备制造有限公司科研项目(2021?KY018) |
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| Author | Institution |
| LU Hai-jun | China Railway Engineering Equipment Group Tunnel Equipment Manufacturing Co., Ltd., Henan Xinxiang 453011, China |
| SHUI Jian-hong | Sinohydro Bureau 11 Co., Ltd., Henan Sanmenxia 450001, China |
| WANG Kai | China Railway Engineering Equipment Group Tunnel Equipment Manufacturing Co., Ltd., Henan Xinxiang 453011, China |
| SHANG Yong | China Railway Engineering Equipment Group Tunnel Equipment Manufacturing Co., Ltd., Henan Xinxiang 453011, China |
| JIANG Hai-feng | China Railway Engineering Equipment Group Tunnel Equipment Manufacturing Co., Ltd., Henan Xinxiang 453011, China |
| WEI Jin | China Railway Engineering Equipment Group Tunnel Equipment Manufacturing Co., Ltd., Henan Xinxiang 453011, China |
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| 中文摘要: |
| 目的 确定含WC微粒镍基熔覆层中不同共晶相对熔覆层性能的影响规律。方法 通过等离子工艺制备含WC(质量分数10%)的Ni60熔覆层，并调整电流，以控制WC的熔解析出。通过维氏硬度计、剪切试验、磨粒磨损试验研究不同电流下熔覆层硬度、抗剪强度和耐磨性的变化情况，并通过扫描电镜和X射线衍射仪分析不同熔覆层的磨损形貌、组织和物相组成。结果 在不同电流下制备的熔覆层物相均主要为γ−(Fe,Ni)、M23C6、M7C3、WC、W2C、FeNi3、FeW2B2等。熔覆电流由110 A增至200 A时，熔覆层的硬度由846.7HV降至665.8HV，抗剪强度由174.9 MPa增至373.2 MPa。当电流低于140 A时，W、Cr、C等合金元素生成了块状先共晶相，可有效减轻磨粒磨损程度，提高耐磨性;当电流进一步增大时，W、Cr、C等合金元素以鱼骨状过共晶相析出，在磨粒磨损过程中易断裂、脱落，导致耐磨性下降。结论 熔覆电流的变化会影响含WC微粒Ni60熔覆层的共晶碳化物成分、形态和数量，在熔覆电流较小时有利于块状先共晶相的生成，可提高其耐磨性。在熔覆电流为140 A时，Ni60+WC(10%)熔覆层的综合性能最优。 |
| 英文摘要: |
| The Ni60 coatings containing WC particles have been widely used because of its excellent performance. The effects of preparation technology, size and content of WC particles on performance of Ni60 coatings are in-depth studied, but the effects of different eutectic carbides generated during cladding are not so clear. The work aims to study the effects of different eutectic carbides on the shear strength and wear resistance of Ni60 coatings containing WC particles to improve the performance of Ni60 coatings. Long squares made by 42CrMo steel with dimensions of 100 mm×40 mm×20 mm were used as matrix and ground by a grinder before cladding. Different Ni60 coatings containing 10% WC particles(50-150 μm) were prepared with different cladding currents (110, 140 170, 200 A) by plasma arc. The samples for wear test were single-side coating, and the samples for shear test were double-side coating. The microhardness of different coatings was measured by microhardness (HV-1000Z). The dry abrasive wear tests were performed on grain-abrasion testing machine (MLGS-225C) and the weight losses were calculated. The shear tests were carried out by universal testing machine (UTM535X-30T) with a selfmade shear tooling which had a square hole in the middle, the areas of the coating and the maximal forces during shear test were measured, and the shear strengths were calculated. The wear morphology, microstructure and phase composition were studied by scanning electron microscope (EM-30AX+) and X-ray diffraction (XRD-6100X). The results showed that the coatings by different cladding currents were mainly composed of γ-(Fe,Ni), M23C6, M7C3, WC, W2C, FeNi3 and FeW2B2. When the current increased from 110 A to 200 A, the microhardness of the coatings decreased from 846.7HV to 665.6HV, and the shear strength increased from 174.7 MPa to 373.2 MPa. The weight loss decreased initially, followed by an increase when the cladding current was larger than 140 A, the minimum weight loss was 0.434 g when the cladding current was 140 A. Massive eutectic carbides were generated by alloying elements such as W, Cr and C in the coating. When the cladding current was not above 140 A, the massive eutectic carbide can stop hard abrasive particles from scratching the coating matrix because of its high hardness and large size, which can enhance the abrasive resistance of the coating; When the cladding current was larger than 140 A, eutectic herringbone carbides containing W, Cr and C were generated, which were hard and crisp. And eutectic herringbone carbides would break into fragments first and then turned to pellets under the continuous impact of hard abrasive particles, then the protective effect of eutectic herringbone carbides on coating matrix was reduced. The pellets can be easily stripped from the coating when the coating matrix around them were worn off, which resulted in a further decrease of the abrasive resistance of the coating. The change of cladding current can affect the composition, morphology and quantity of eutectic carbides of Ni60 coatings containing WC particles. Small cladding current is conducive to the formation of massive eutectic carbides, which can improve the wear resistance of the coating. The Ni60+WC(10%) coating has the best comprehensive performance when the cladding current is 140 A. |
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