赵菲,张亮,吴志生,温保安.Cr3C2/WC的添加对Stellite 12熔覆层耐磨耐蚀性的影响[J].表面技术,2024,53(1):135-142.
ZHAO Fei,ZHANG Liang,WU Zhisheng,WEN Baoan.Effect of Cr3C2/WC on Wear and Corrosion Resistance of Stellite 12 Cladding Layer[J].Surface Technology,2024,53(1):135-142 |
| Cr3C2/WC的添加对Stellite 12熔覆层耐磨耐蚀性的影响 |
| Effect of Cr3C2/WC on Wear and Corrosion Resistance of Stellite 12 Cladding Layer |
| 投稿时间：2022-10-17 修订日期：2023-03-13 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.01.013 |
| 中文关键词: 激光熔覆 复合熔覆层 显微硬度 摩擦磨损行为 磨损机制 电化学腐蚀行为 |
| 英文关键词:laser cladding composite cladding layer microhardness friction and wear behavior wear mechanism electrochemical corrosion behavior |
| 基金项目:山西省基础研究计划(面上)(202303021211195) |
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| Author | Institution |
| ZHAO Fei | School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China |
| ZHANG Liang | School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China |
| WU Zhisheng | School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China |
| WEN Baoan | School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China |
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| 中文摘要: |
| 目的 提高Stellite 12熔覆层的耐磨耐蚀性能。方法 将Stellite 12合金粉末与碳化物(Cr3C2、WC)混合，采用激光熔覆技术在H13钢板上制备复合熔覆层。通过超景深显微镜和XRD分析其显微组织和物相，通过显微硬度测试、摩擦磨损试验和电化学腐蚀试验，分别评价熔覆层的硬度、耐磨性和耐蚀性，并通过超景深显微镜对磨痕形貌进行分析。结果 添加碳化物后，熔覆层的微观组织以柱状晶和树枝晶为主，物相主要由γ-Co固溶体和碳化物(M23C6、M7C3)组成;Cr3C2的添加使得熔覆层的硬度降低，由610HV0.2降至530HV0.2，但耐磨性得到提高，磨损量由0.45 mm3降至0.33 mm3，下降了28%，耐蚀性得到提高，腐蚀电位由−0.385 V增加到−0.264 V，腐蚀电流密度由9.269×10−10 A/cm2降至1.496×10−10 A/cm2，极化电阻由3.982×107 Ω.cm2提升至2.424×108 Ω.cm2，提高了1个数量级;WC的添加使其硬度由610HV0.2提高至750HV0.2，磨损深度变浅，磨损量由0.45 mm3降至0.19 mm3，下降了43%，但耐腐蚀性有所降低。3种熔覆层的磨损机制主要为磨粒磨损和黏着磨损。结论 WC的添加可以有效提高熔覆层的硬度和耐磨性，但耐腐蚀性有所降低;添加Cr3C2后，耐蚀性得到显著提高，耐磨性略微提升，但硬度降低。 |
| 英文摘要: |
| The properties of composite cladding layers prepared by laser cladding technology will vary considerably with the reinforcing phase. In order to study the effect of different carbide contents on the properties of the Stellite 12 cladding layer, the raw material used was Stellite 12 alloy powder with carbide (Cr3C2 and WC). In addition, 30 cm×30 cm×10 cm H13 steel was adopted as the substrate, on which Stellite 12, Stellite 12+10%Cr3C2 and Stellite 12+10%WC were prepared by laser cladding technology. The three cladding layers of Stellite 12, Stellite 12+10%Cr3C2 and Stellite 12+10%WC were then cut, ground and polished and corroded with aqua regia. The microstructures of layers were analyzed by ultra-deep field microscopy, the surfaces were examined by Xrd to analyze the physical phases and the hardness, wear resistance and corrosion resistance were evaluated by microhardness testing, friction wear testing and electrochemical corrosion testing, respectively. The wear scar morphology was also analyzed by ultra-deep field microscopy. The metallurgical results showed that the microstructures of the cladding layers were dominated by columnar crystals and dendrites after the addition of carbides, with the grain transformation from bottom to top being flat crystals to columnar crystals and then to dendrites and good metallurgical bonding at the surface of the bonding interface. Xrd inspection results showed that the three cladding layers had phases mainly composed of γ-Co solid solution and carbides (M23C6, M7C3), but the addition of WC led to the precipitation of Co6W6C and M7C hard phases. In terms of microhardness, the melt layer of Stellite 12 was 610HV0.2, the addition of Cr3C2 reduced the hardness of the melt layer to 530HV0.2 and the addition of WC increased its hardness to 750HV0.2. The wear performance was analyzed in terms of its average friction coefficient, wear profile and wear volume. The addition of Cr3C2 reduced the average coefficient of friction from 0.324 28 to 0.291 87 and the wear volume from 0.45 mm3 to 0.33 mm3, a decrease of 28%, but the wear depth did not change much, while the addition of WC reduced the average coefficient of friction from 0.324 28 to 0.115 58 and the wear volume from 0.45 mm3 to 0.19 mm3, a decrease of 43%, and the wear depth became shallow, from 70 µm to about 30 µm. The wear mechanism of the three cladding layers was mainly abrasive wear and adhesive wear, as analyzed by ultra-deep field microscopy. The polarization curve showed that the corrosion potential of Cr3C2 increased from −0.385 V to −0.264 V, the corrosion current density decreased from 9.269×10−10 A/cm2 to 1.496×10−10 A/cm2 and the polarization resistance increased from 3.982×107 Ω.cm2 to 2.424×108 Ω.cm2, an increase of one order of magnitude. The corrosion resistance was significantly improved, while the addition of WC led to a reduction in corrosion resistance. Compared to the two carbide-added cladding layers, the addition of WC increases the hardness by about 1.4 times compared to the addition of Cr3C2, the depth of wear marks is almost 40 µm shallower and the wear is about 57% less, but the corrosion resistance is reduced and the self-corrosion potential is shifted to the left by 0.131 V. |
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