Aktaş Çelik Gülşah, Atapek Şaban Hakan, Polat Şeyda, Obrosov Aleksei, Weiß Sabine
Laboratory of High Temperature Materials, Department of Metallurgical and Materials Engineering, Kocaeli University, İzmit 41001, Türkiye.
Department of Physical Metallurgy and Materials Technology, Brandenburg University of Technology Cottbus-Senftenberg, 03046 Cottbus, Germany.
Materials (Basel). 2023 Mar 31;16(7):2804. doi: 10.3390/ma16072804.
In this study, heat-treated and multisurface engineered DIN 1.2367 tool steel was subjected to room and elevated temperature wear tests, and the effect of nitriding on its tribological behavior was investigated. CrN, AlTiN, and CrN/AlTiN coatings with a total thickness of 2 µm were obtained by arc cathodic physical vapor deposition on conventional heat-treated and gas-nitrided steels. The white layer formed during nitriding was removed, and a diffusion layer (100 µm) was achieved in the cross section of the steel having a tempered martensitic matrix. The highest surface hardness was attained with an integral coating (CrN/AlTiN), and surface hardness increased even more after nitriding due to the formation of a multicomponent ceramic layer on top of the diffusion layer. The room temperature wear tests performed against an alumina counterpart revealed that (i) CrN/AlTiN-coated steel had the highest friction coefficient of 0.26, which further increased to 0.33 by nitriding due to the increase in shear strength, and that (ii) with increasing surface hardness, the specific wear rates (W) of the heat-treated and coated steels could be ranked as follows: W < W < W. The wear rates decreased when nitriding was carried out prior to coating. In order to simulate the aluminum extrusion conditions, hot wear behavior of the surfaces against AA6080 alloy at 450 °C was investigated. The hot wear tests revealed that (i) high friction coefficients were reached due to the adhesive characteristic of aluminum to the surfaces, (ii) the nitrided and CrN/AlTiN-coated sample exhibited the lowest wear rate among all studied surfaces, and (iii) the film damage on the worn surfaces mostly occurred in the form of droplet delamination.
在本研究中，对经过热处理和多表面工程处理的DIN 1.2367工具钢进行了室温和高温磨损试验，并研究了氮化对其摩擦学行为的影响。通过电弧阴极物理气相沉积在常规热处理和气体氮化钢上获得了总厚度为2 µm的CrN、AlTiN和CrN/AlTiN涂层。去除了氮化过程中形成的白层，并在具有回火马氏体基体的钢的横截面上获得了一个扩散层（100 µm）。整体涂层（CrN/AlTiN）具有最高的表面硬度，并且由于在扩散层顶部形成了多组分陶瓷层，氮化后表面硬度进一步提高。与氧化铝配对物进行的室温磨损试验表明：（i）CrN/AlTiN涂层钢的摩擦系数最高，为0.26，由于剪切强度的增加，氮化后摩擦系数进一步增加到0.33；（ii）随着表面硬度的增加，热处理和涂层钢的比磨损率（W）可按以下顺序排列：W < W < W。在涂层之前进行氮化时，磨损率降低。为了模拟铝挤压条件，研究了在450°C下表面与AA6080合金的热磨损行为。热磨损试验表明：（i）由于铝与表面的粘附特性，达到了高摩擦系数；（ii）在所有研究表面中，氮化和CrN/AlTiN涂层的样品磨损率最低；（iii）磨损表面上的膜损伤主要以液滴分层的形式出现。
