骆芳,胡金昕,宣丹枫.Mo含量对Stellite21堆焊层组织与性能的影响[J].表面技术,2025,54(11):221-230.
LUO Fang,HU Jinxin,XUAN Danfeng.Effect of Mo Content on Microstructure and Properties of Stellite21 Surfacing Layer[J].Surface Technology,2025,54(11):221-230 |
| Mo含量对Stellite21堆焊层组织与性能的影响 |
| Effect of Mo Content on Microstructure and Properties of Stellite21 Surfacing Layer |
| 投稿时间：2024-11-07 修订日期：2025-04-07 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.11.019 |
| 中文关键词: 三偏心蝶阀 等离子弧堆焊 Stellite21钴基合金 Mo含量 耐磨性 耐蚀性 |
| 英文关键词:triple eccentric butterfly valve plasma arc surfacing stellite21 cobalt-based alloy Mo content wear resistance corrosion resistance |
| 基金项目: |
| 作者 | 单位 |
| 骆芳 | 浙江工业大学 之江学院，浙江 绍兴 312030;浙江工业大学 激光先进制造研究院，杭州 310023;浙江省高端激光制造装备协同创新中心，杭州 310023 |
| 胡金昕 | 浙江工业大学 之江学院，浙江 绍兴 312030;浙江工业大学 激光先进制造研究院，杭州 310023;浙江省高端激光制造装备协同创新中心，杭州 310023 |
| 宣丹枫 | 浙江工业大学 之江学院，浙江 绍兴 312030;浙江工业大学 激光先进制造研究院，杭州 310023;浙江省高端激光制造装备协同创新中心，杭州 310023 |
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| Author | Institution |
| LUO Fang | Zhijiang College of Zhejiang University of Technology, Zhejiang Shaoxing 312030, China;Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310023, China;Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310023, China |
| HU Jinxin | Zhijiang College of Zhejiang University of Technology, Zhejiang Shaoxing 312030, China;Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310023, China;Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310023, China |
| XUAN Danfeng | Zhijiang College of Zhejiang University of Technology, Zhejiang Shaoxing 312030, China;Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310023, China;Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310023, China |
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| 中文摘要: |
| 目的 提高三偏心蝶阀硬密封面Stellite21钴基合金堆焊层的耐磨性和耐蚀性。方法 使用行星角磨机充分混合Stellite21粉末和钼(Mo)粉，并采用等离子弧堆焊技术在WCB铸钢上制备了不同质量分数Mo(5.5%、7.5%、10%、12.5%、15%)的堆焊层，使用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)，对堆焊层的金相组织、成分分布和物相组成进行分析，并通过维氏硬度测试、摩擦磨损、电化学腐蚀试验和浸泡腐蚀试验，探究不同Mo含量对堆焊层硬度、耐磨性和耐蚀性的影响。结果 随着Mo含量的增加，堆焊层中柱状晶的持续生长受到抑制，形成了更多短小的枝晶和等轴晶;Mo2C相集中在晶界处，Co7Mo6和Co3Mo相的含量增加，而Cr23C6型碳化物相的含量相对减少;堆焊层的硬度随着Mo含量的增加而提高，当Mo质量分数达到15%时，显微硬度达到最高值398HV，与含5.5%Mo的堆焊层相比，硬度提高了约19.5%;当Mo质量分数为10%时，堆焊层的摩擦系数和磨损量最低，分别降低了约17.2%和79.1%，且堆焊层也表现出高腐蚀电位和低腐蚀电流密度，分别为‒0.999 V和1.552× 10‒5 A/cm2，浸泡腐蚀完后的失重系数K降至最低，K值为1.54%。结论 加入4.5%Mo粉，使Stellite21钴基合金的Mo含量达到10%(质量分数)，能有效提升密封面堆焊层的硬度、耐磨性和耐蚀性，延长三偏心蝶阀的工作使用寿命。 |
| 英文摘要: |
| The triple eccentric butterfly valves are widely employed in fluid systems (gas/liquid) as critical components for regulating flow direction, rate, and pressure. Their sealing surfaces, which ensure sealing and blockage functions, are prone to damage due to corrosion, erosion, abrasive wear, and other media-induced effects during operation. Enhancing operational reliability and extending service life remain key objectives for sealing surface materials. Plasma transferred arc (PTA) surfacing, an advanced surface modification technology, offers advantages such as high deposition quality, efficiency, low dilution rate, cost-effectiveness, and compatibility with high-temperature, high-hardness materials. Stellite21 cobalt-based alloy, a high-performance Co-Cr-Mo alloy, is renowned for its exceptional wear resistance, corrosion resistance, and high-temperature stability. Optimizing its composition by adjusting molybdenum (Mo) content holds significant research potential for further improving comprehensive properties. This study fabricates Stellite21-based surfacing layers via PTA technology and systematically investigates the influence of Mo contents on microstructure and performance. Stellite21 alloy powder and Mo powder are mixed and ball-milled for 2 hours with a planetary angle grinder to achieve uniform dispersion. Surfacing layers with different mass fractions of Mo (5.5wt.%, 7.5wt.%, 10wt.%, 12.5wt.%, and 15wt.%) are fabricated on the substrate surface with plasma arc surfacing welding equipment DML-V03BD. The plasma gas, powder feeding gas, and shielding gas are all argon. The welding current is 115 A, the powder feeding rate is 20 g/min, the swing width is 10 mm, the swing speed is 10 mm/s, and the rotation speed is 1 r/min. The samples are cut using an electric spark wire cutting machine, and the cross-sections are polished and etched with 8% FeCl3 solution. Then, the microstructure, composition distribution, and phase composition of the surfacing layers are analyzed by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffractometer (XRD). The microhardness of the surfacing layers is tested with a Vickers hardness tester XHV-1000T-CCD. The friction coefficient of the surfacing layers is measured with a friction and wear testing machine HT-600, and the shape of the worn surface is measured with a laser scanning microscope system to calculate the wear volume. An electrochemical corrosion test is carried out in the electrochemical workstation, and the corrosion potential and corrosion current density are calculated according to the obtained a Tafel curve. Finally, the sample is soaked in 36 wt.% HCl solution for 120 h, and the immersion corrosion is carried out, and the weight loss coefficient is calculated. The results indicate that with the increase in the Mo content, the continuous growth of columnar crystals in the surfacing layer is inhibited, resulting in the formation of more short dendrites and equiaxed crystals, and the grains are continuously refined. The phases of the Stellite21 alloy surfacing layer mainly consist of cobalt-based solid solution γ-Co, Co7Mo6, Co3Mo, Mo2C, Cr23C6, etc. The Mo2C phase is concentrated at the grain boundaries. With the increase in the Mo content, the content of Cr23C6 decreases, while the contents of Co7Mo6, Co3Mo, and Mo2C relatively increase. The hardness of the surfacing layer increases with the increase in the Mo content. When the Mo content reaches 15wt.%, the microhardness reaches the maximum value of 398HV, which is approximately 19.5% higher compared with the surfacing layer with 5.5wt.% Mo. When the Mo content is 10wt.%, the friction coefficient and the wear volume of the surfacing layer are the lowest, decreasing by approximately 17.2% and 79.1%, respectively. Moreover, the surfacing layer also exhibits a high corrosion potential and low corrosion current density, which are ‒0.999 V and 1.552×10‒5 A/cm2, respectively. After immersion, the weight loss coefficient K decreases to the lowest, and the K value is 1.54%. In conclusion, when the Mo content is 10wt.%, the wear resistance and the corrosion resistance of the Stellite21 cobalt-based alloy surfacing layer can be maximized, thereby ensuring the operational reliability of the sealing surface of the triple eccentric butterfly valve. |
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