The effects of Ni and Al elements on microstructure and mechanical properties of low carbon CoCrMo alloy coatings

IF 5.3 2区 材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-09-12 DOI:10.1016/j.surfcoat.2024.131355
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Abstract

Low-carbon cobalt-based alloy coatings with high ductility and low thermal fatigue crack propagation rates were prepared using laser cladding (LC) technology. The microstructure of the coatings was characterized using SEM, EBSD, and TEM, while the mechanical properties were tested and analyzed. The CoCrMo alloy primarily consists of γ-Co and a minor amount of ε-Co. The addition of Ni increased the stacking fault energy (SFE), resulting in the retention of γ-Co in the alloy. However, the increase of Al content reduced the SFE, leading to the precipitation of Al3Ni intermetallic compound along with a eutectic region with Al3Ni, Cr23C6, and ε-Co. More ε-Co phase appeared after tensile deformation due to the stress-induced transformation induced plasticity (TRIP) effect. Ni addition increased the content of face-centered cubic (fcc) γ-Co, enhancing the coating's ductility by approximately 85 % compared to CoCrMo. With higher Al content, the ε-Co phase increased, and the dispersion of Al3Ni improved the coatings' strength. The jagged structure of the eutectic region increased the resistance to thermal fatigue crack propagation, causing the crack propagated along the grain boundary. Optimal mechanical properties were achieved with the addition of 13 wt% Ni and 7 wt% Al, which achieved a 53 % increase in ductility and a 40 % reduction in the thermal fatigue crack propagation rate compared to CoCrMo.

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镍和铝元素对低碳 CoCrMo 合金涂层微观结构和机械性能的影响
利用激光熔覆(LC)技术制备了具有高延展性和低热疲劳裂纹扩展率的低碳钴基合金涂层。使用 SEM、EBSD 和 TEM 对涂层的微观结构进行了表征,同时对其机械性能进行了测试和分析。CoCrMo 合金主要由 γ-Co 和少量 ε-Co 组成。镍的加入增加了堆叠断层能(SFE),使合金中保留了γ-钴。然而,铝含量的增加降低了堆叠断层能,导致 Al3Ni 金属间化合物析出,并形成 Al3Ni、Cr23C6 和 ε-Co 共晶区。由于应力诱导的转变诱导塑性(TRIP)效应,拉伸变形后出现了更多的ε-Co 相。镍的加入增加了面心立方(fcc)γ-Co 的含量,与 CoCrMo 相比,涂层的延展性提高了约 85%。随着铝含量的增加,ε-Co 相增加,Al3Ni 的分散提高了涂层的强度。共晶区的锯齿状结构增加了热疲劳裂纹扩展的阻力,导致裂纹沿晶界扩展。与 CoCrMo 相比,添加 13 wt% Ni 和 7 wt% Al 可使延展性提高 53%,热疲劳裂纹扩展率降低 40%,从而获得最佳机械性能。
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来源期刊
Surface & Coatings Technology
Surface & Coatings Technology 工程技术-材料科学:膜
CiteScore
10.00
自引率
11.10%
发文量
921
审稿时长
19 days
期刊介绍: Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.
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