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| 不同Nb含量对(Nb,Ti)C颗粒强化Fe基复合堆焊层微观组织及耐磨性影响研究 |
| Effect of Different Nb Contents on Microstructure and Wear Resistance of (Nb,Ti)C Particle Reinforced Fe Matrix Composite Arc Surfacing Layer |
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| DOI：10.3969/j.issn.1674-6457.2023.02.012 |
| 中文关键词: Fe基复合涂层 (Nb,Ti)C 电弧堆焊 硬度 磨损 |
| 英文关键词: Fe matrix composite coating (Nb,Ti)C arc surfacing hardness wear |
| 基金项目:广东省科学院发展专项资金(2022GDASZH-2022010203);广东省基础与应用基础研究基金(2020A1515110327) |
| Author Name | Affiliation | | NIU Ben | China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | ZENG Bang-xing | China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | ZOU Xiao-dong | China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | YI Jiang-long | China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | PENG Lin | Pangang Group Company Limited, Sichuan Panzhihua 617067, China |
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| 中文摘要: |
| 目的 颗粒强化金属基复合涂层由于具有优异的力学性能及良好的耐磨性，受到了研究人员的广泛关注，然而，较少有文献报道复合强化相含量与复合涂层力学性能的关系，特别是在电弧堆焊制备的复合涂层中。因此，有必要探明强化颗粒含量对Fe基复合堆焊涂层微观组织及耐磨性的影响规律，为设计新型Fe基复合堆焊材料提供试验依据。方法 通过向药芯焊丝中添加不同含量的Nb，以原位合成(Nb,Ti)C强化相，并据此调控电弧堆焊层中原位生成的(Nb,Ti)C数量密度，进而影响堆焊层的微观组织、硬度及耐磨性。结果 随着Nb的添加，熔覆过程中Nb与基体中的C、Ti反应，原位生成了立方结构的(Nb,Ti)C相，且(Nb,Ti)C相含量随着Nb含量的增加而逐渐增大。与未添加Nb时相比，含质量分数为6% Nb的堆焊层中(Nb,Ti)C复合颗粒的数量密度增加到0.53个/μm2，硬度也由673.08HV0.5增大到734.88HV0.5。摩擦磨损试验结果表明，随着Nb的增加，磨损量呈现出逐渐降低的趋势，其中，Nb含量为6wt.%的堆焊层样品表现出了最浅、最平滑的磨痕，其磨损率仅为1.12×10‒8 mm3/(N.m)，磨损机制为轻微的黏着磨损。结论 提高Nb的添加量可以增大(Nb,Ti)C强化相的数量密度，有效提升堆焊层的硬度及耐磨性，并在添加质量分数为6%的Nb时表现出最高的耐磨性能。 |
| 英文摘要: |
| Recently, the particle reinforced metal matrix composite coating has been widely concerned by researchers because of its outstanding mechanical properties and excellent wear resistance. However, there are few researches on the relationship between the content of composite strengthening phase and the mechanical properties of composite coating, especially for the composite coating prepared by arc surfacing. The work aims to study the effect of reinforced particle content on microstructure and wear resistance of Fe matrix composite arc surfacing coating, so as to provide experimental basis for the design of new Fe matrix composite arc surfacing materials. Different contents of Nb were added into the flux-cored welding wire to synthesize the (Nb,Ti)C strengthening phase in-situ, and the quantity density of (Nb,Ti)C generated in-situ in arc surfacing layer was regulated accordingly to affect the microstructure, hardness and wear resistance of the arc surfacing layer. With the addition of Nb, Nb reacted with C and Ti in the matrix during the cladding process to form (Nb,Ti)C phase with cubic structure in-situ, and the content of (Nb,Ti)C phase gradually increased with the increase of Nb content. Compared to the arc surfacing layer without Nb, the amount of (Nb,Ti)C particles in the arc surfacing layer with 6wt.% Nb increased to 0.53 N/μm2 and the value of Vickers hardness increased from 673.08 HV0.5 to 734.88 HV0.5. Further, according to the results of friction and wear test, with the increase of Nb, the wear rate also showed a trend of reduction. The arc surfacing layer with 6wt.% Nb showed a much shallower smooth wear track profile, with a wear rate of 1.12×10‒8 mm3/(N.m), and the wear mechanism was slight adhesion wear. In a word, increasing the amount of Nb can increase the quantity density of (Nb,Ti)C strengthening phase and effectively improve the hardness and wear resistance of the arc surfacing layer, and the layer can obtain the highest wear resistance when added with 6wt.% Nb. |
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