A Comprehensive Study of Al0.6Ti0.4N Coatings Deposited by Cathodic Arc and HiPIMS PVD Methods in Relation to Their Cutting Performance during the Machining of an Inconel 718 Alloy

L. W. Reolon, M. Aguirre, Kenji Yamamoto, Qinfu Zhao, I. Zhitomirsky, G. Fox-Rabinovich, S. Veldhuis
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引用次数: 5

Abstract

The structural, physical–chemical, and micromechanical characteristics of Al0.6Ti0.4N coatings deposited by different physical vapor deposition (PVD) methods, such as cathodic arc deposition (CAD), as well as advanced HiPIMS techniques were investigated in terms of their cutting performance during the machining of an Inconel 718 alloy. XRD studies had revealed that the HiPIMS coating featured lower residual stresses and more fine-grained structure. Electrochemical characterization with the potentiostat-impendence method shows that the HiPIMS coating has a significantly lower porosity than CAD. SEM and AFM studies of the surface morphology demonstrate that the HiPIMS coating has a smoother surface and an absence of droplet phases, in contrast with CAD. XRD, combined with FIB/TEM studies, shows a difference in the crystal structure of both coatings. The micromechanical characteristics of each coating, such as hardness, elastic modulus, fracture toughness, and adhesion to the substrate, were evaluated. The HiPIMS coating was found to possess a more beneficial combination of micromechanical properties compared to CAD. The beneficial characteristics of the HiPIMS coating alleviated the damage of the coated layer under operation. Combined with grain size refinement, this results in the improved adaptive performance of the HiPIMS coating through the formation of a greater amount of thermal barrier sapphire tribo-films on the friction surface. All of these characteristics contribute to the reduction of flank and crater wear intensity, as well as notching, leading to an improvement of the HiPIMS coating’s tool life.
阴极电弧和HiPIMS PVD沉积Al0.6Ti0.4N涂层对Inconel 718合金切削性能影响的综合研究
研究了不同物理气相沉积(PVD)方法(如阴极电弧沉积(CAD))和先进的HiPIMS技术沉积的Al0.6Ti0.4N涂层在加工Inconel 718合金过程中的组织、物理化学和微观力学特性。XRD研究表明,该涂层具有较低的残余应力和较细的晶粒结构。用恒电位阻抗法进行电化学表征表明,HiPIMS涂层的孔隙率明显低于CAD涂层。表面形貌的SEM和AFM研究表明,与CAD相比,HiPIMS涂层具有更光滑的表面,并且没有液滴相。XRD结合FIB/TEM研究表明,两种涂层的晶体结构存在差异。评估了每种涂层的微观力学特性,如硬度、弹性模量、断裂韧性和与基体的附着力。与CAD相比,HiPIMS涂层具有更有利的微机械性能组合。HiPIMS涂层的有利特性减轻了涂层在使用过程中的损伤。结合晶粒尺寸的细化,通过在摩擦表面形成更多的热障蓝宝石摩擦膜,从而提高了HiPIMS涂层的自适应性能。所有这些特性都有助于减少侧面和陨石坑的磨损强度,以及缺口,从而提高HiPIMS涂层的工具寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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