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Influence of Sintered Low-Alloy Steel Microstructure on the DLC Coating Characteristics
Transactions of the Indian Institute of Metals ( IF 1.6 ) Pub Date : 2020-04-02 , DOI: 10.1007/s12666-020-01943-7
Mahsa Haji Ghasemi , Behrooz Ghasemi , Hamid Reza Mohammadian Semnani

In this study, the effect of base steel microstructure on the white layer was obtained by plasma nitriding and DLC coating investigated. For this purpose, sintered iron-based steel containing molybdenum (based Astaloy Mo) was used. The steel powders were formed by the hydraulic press and sintered in the NH3 atmosphere. After that, samples were cooled with two different cooling rates (0.5 and 3 °C/s). Then, the samples were plasma-nitrided. After that, the DLC coating was applied and sliding tests were done under 60 and 90 N normal load. It was found that the microstructure differences were obtained because the cooling rate had a significant effect on the roughness, coating thickness, and ratio of the phases in the white layer, and these changes affected the DLC coating. So, the wear and mechanical behavior of the coating of the two samples had different properties. It was observed that mass loss approximately changed 75% by increasing the cooling rate. Pulling out, burnishing, cracking, and oxidation were the main mechanisms of the DLC coatings deposited on the substrate, while in sinter-hardened sample (cooling rate 3 °C), more surface damage was observed. Hardness test, SEM analysis equipped with EDS, RBS and nanoindentation test were used to evaluate DLC coating.



中文翻译:

烧结低合金钢组织对DLC涂层性能的影响

在本研究中,通过等离子渗氮和DLC涂层研究获得了基体钢组织对白色层的影响。为此,使用了含钼的烧结铁基钢(基于Astaloy Mo)。通过水压机将钢粉成型并在NH 3中烧结大气层。之后,以两种不同的冷却速率(0.5和3°C / s)冷却样品。然后,将样品进行等离子体氮化。之后,施加DLC涂层并在60和90 N的正常载荷下进行滑动测试。发现获得了微观结构差异,因为冷却速率对白色层中的粗糙度,涂层厚度和相比具有显着影响,并且这些变化影响了DLC涂层。因此,两个样品的涂层的磨损和机械性能具有不同的性能。观察到,通过增加冷却速率,质量损失大约改变了75%。拉出,抛光,开裂和氧化是沉积在基材上的DLC涂层的主要机理,而在烧结硬化的样品中(冷却速度为3°C),观察到更多的表面损伤。硬度测试,配备EDS的SEM分析,RBS和纳米压痕测试用于评估DLC涂层。

更新日期:2020-04-02
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