基底预热温度对镍基合金涂层微观结构和性能的影响

IF 3.1 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Yu Liu, Haiquan Jin, Tianhao Xu, Zhiqiang Xu, Fengming Du, Miao Yu, Yali Gao, Dongdong Zhang
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引用次数: 0

摘要

激光熔覆是一种在金属基材表面制造涂层的新技术。由于铜的热导率和反射率较高,因此铜基材的性能通常不是很好。适当的预热温度有助于制造出具有良好质量和性能的涂层,尤其是在铜基底上。为了研究不同预热温度的影响,我们通过激光在铜基底上制作了四种不同预热温度(100、200、300 和 400 ℃)的涂层。使用 SEM、XRD、EDS、维氏显微硬度计、磨损测试仪和电化学工作站对四种涂层的微观结构和性能进行了研究。结果表明,镍基合金粉末中的元素均匀地分布在结合区域,获得了良好的冶金结合。显微组织主要由蜂窝状晶体、树枝状晶体和平面晶体组成,主要强化相为γ(铁、镍)、Cr0.09Fe0.7Ni0.21、WC 和 Ni3B。四种涂层的平均显微硬度值分别为 614.3、941.6、668.1 和 663.1 HV0.5。四种涂层的磨损率分别为 9.7、4.9、12.5 和 13.3 × 10-5 mm3-N-1-m-1,低于铜基体的磨损率(4.3 × 10-3 mm3-N-1-m-1)。磨损率降低的原因是强化相的存在,如 WC、Ni3B、M7C3(M=铁、铬)和 Cr0.09Fe0.7Ni0.21。200 °C 预热涂层中的细小晶体也提高了耐磨性。此外,腐蚀电流密度的最小值分别为 3.26 × 10-5、2.34 × 10-7、4.02 × 10-6 和 4.21 × 10-6 mA-mm-2。由此可见,在 200 ℃ 下预热的涂层具有更高的显微硬度、更低的磨损率和更好的耐腐蚀性,这是因为存在强化相和细小均匀的晶体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of a Substrate’s Preheating Temperature on the Microstructure and Properties of Ni-Based Alloy Coatings
Laser cladding is a new technology to fabricate a coating on the surface of a metal substrate. The properties on copper substrates are usually not very good due to the high thermal conductivity and reflectivity. The appropriate preheating temperature is helpful to fabricate coatings with good quality and properties, especially for copper substrates. In order to investigate the effect of different preheating temperatures, four coatings with different preheating temperatures (100, 200, 300 and 400 °C) were fabricated via a laser on a copper substrate. The microstructures and properties of four coatings were investigated using SEM, XRD, EDS, a Vickers microhardness meter, a wear tester and an electrochemical workstation. The results show that the elements from Ni-based alloy powder were uniformly distributed among the binding region, which obtained a good metallurgical bonding. The microstructure was mainly composited of cellular, dendrite and plane crystals, and the main reinforced phases were γ (Fe, Ni), Cr0.09Fe0.7Ni0.21, WC and Ni3B. The values of average microhardness of the four coatings were 614.3, 941.6, 668.1 and 663.1 HV0.5, respectively. The wear rates of the four coatings were 9.7, 4.9, 12.5 and 13.3 × 10−5 mm3·N−1·m−1, respectively, which were less than that of the copper substrate (4.3 × 10−3 mm3·N−1·m−1). The decrease in wear rate was due to the existence of the reinforced phases, such as WC, Ni3B, M7C3 (M=Fe, Cr) and Cr0.09Fe0.7Ni0.21. The fine crystals in the coating preheated at 200 °C also improved the wear resistance. Additionally, the minimum values of corrosion current density were 3.26 × 10−5, 2.34 × 10−7, 4.02 × 10−6 and 4.21 × 10−6 mA·mm−2, respectively. It can be seen that the coating preheated at 200 °C had higher microhardness, lower wear rates and better corrosion resistance due to the existence of reinforced phases and fine and uniform crystals.
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来源期刊
Lubricants
Lubricants Engineering-Mechanical Engineering
CiteScore
3.60
自引率
25.70%
发文量
293
审稿时长
11 weeks
期刊介绍: This journal is dedicated to the field of Tribology and closely related disciplines. This includes the fundamentals of the following topics: -Lubrication, comprising hydrostatics, hydrodynamics, elastohydrodynamics, mixed and boundary regimes of lubrication -Friction, comprising viscous shear, Newtonian and non-Newtonian traction, boundary friction -Wear, including adhesion, abrasion, tribo-corrosion, scuffing and scoring -Cavitation and erosion -Sub-surface stressing, fatigue spalling, pitting, micro-pitting -Contact Mechanics: elasticity, elasto-plasticity, adhesion, viscoelasticity, poroelasticity, coatings and solid lubricants, layered bonded and unbonded solids -Surface Science: topography, tribo-film formation, lubricant–surface combination, surface texturing, micro-hydrodynamics, micro-elastohydrodynamics -Rheology: Newtonian, non-Newtonian fluids, dilatants, pseudo-plastics, thixotropy, shear thinning -Physical chemistry of lubricants, boundary active species, adsorption, bonding
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