Yang Chu , Haichuan Shi , Peilei Zhang , Zhishui Yu , Hua Yan , Qinghua Lu , Shijie Song , Kaichang Yu
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引用次数: 0
摘要
为了提高镍基超合金的耐磨性并拓宽其应用领域,我们研究了通过选择性激光熔融技术制造的石墨烯纳米颗粒增强 IN718 复合材料的微观结构组织和磨损性能。通过实验和模拟相结合的方法获得了打印的最佳参数,随后在不同的滑动速度(250-350 r/min)和载荷(4N-8N)下探索了其磨损模式。根据复合材料的 TEM 图像并结合实验发现,石墨烯纳米颗粒在 3D 打印的 GNPs/IN718 复合材料中均匀分散,起到了位错强化和负载强化的作用。与 IN718 合金相比,GNPs/IN718 复合材料的平均显微硬度提高了 24.2%。在摩擦试验中,GNPs 起到了润滑相的作用,从而显著提高了复合材料的摩擦磨损性能。平均摩擦系数降低了 33.8%,磨损率降低了 51.3%。随着速度和载荷的增加,复合材料的磨损状态分别从磨料磨损变为分层磨损以及分层磨损和氧化磨损的组合。本文为进一步提高添加式制造的镍基超合金的磨损性能提供了潜在的指导。
Simulation-assisted parameter optimization and tribological behavior of graphene reinforced IN718 matrix composite prepared by SLM
To enhance the wear resistance of nickel-based superalloys and broaden their applications, we investigated the microstructural organization and wear properties of IN718 composites reinforced with graphene nanoparticles fabricated through selective laser melting. The optimal parameters for printing were obtained by combining experiments and simulations, and their wear patterns were subsequently explored at different sliding speeds (250–350 r/min) and loads (4N–8N). Based on the composite TEM images combined with experiments, it was found that the homogeneous dispersion of graphene nanoparticles in the 3D-printed GNPs/IN718 composites acted as dislocation reinforcement and load reinforcement. The average microhardness of the GNPs/IN718 composites increased by 24.2 % compared to the IN718 alloy. In the friction test, GNPs acts as a lubricating phase, resulting in a significant increase in the friction wear performance of the composite. The average coefficient of friction decreased by 33.8 % and the wear rate decreased by 51.3 %. The wear state of the composites change from abrasive wear to delamination wear and a combination of delamination wear and oxidative wear as the speed and load are increased, respectively. This paper provides potential guidance for further improving the wear performance of additively manufactured nickel-based superalloys.
期刊介绍:
This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys.
The journal reports the science and engineering of metallic materials in the following aspects:
Theories and experiments which address the relationship between property and structure in all length scales.
Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations.
Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties.
Technological applications resulting from the understanding of property-structure relationship in materials.
Novel and cutting-edge results warranting rapid communication.
The journal also publishes special issues on selected topics and overviews by invitation only.