High temperature wear resistance of (TiAl)N PVD coating on untreated and gas nitrided AISI H13 steel with different heat treatments
High temperature wear resistance of (TiAl)N PVD coating on untreated and gas nitrided AISI H13 steel with different heat treatments
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DOI：
10.1016/j.wear.2006.06.010
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发表时间：
2007-02
期刊：
影响因子：
5
通讯作者：
R. Rodríguez-Baracaldo;R. Rodríguez-Baracaldo;J. A. Benito;E. S. Puchi-Cabrera;M. Staia
中科院分区：
文献类型：
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作者：
R. Rodríguez-Baracaldo;R. Rodríguez-Baracaldo;J. A. Benito;E. S. Puchi-Cabrera;M. Staia
已通过在室温和 600°C 下使用球盘测试来检查沉积在原样和气体氮化 AISI H13 上的 PVD (Ti0.7Al0.3)N 涂层的耐磨性。为了确定该类型钢的先前热处理对 (Ti0.7Al0.3)N 涂层耐磨性的影响，采用了两次商业热处理，这产生了相同的基体硬度。进行表面显微硬度测量以确定涂层系统的承载能力。一般来说，磨损行为与渗氮工艺之前对基材进行的热处理的性质无关，但很大程度上取决于测试温度。在室温下，测试的不同系统之间存在微小差异，而在高温下，它们之间发现了明显的差异。在铝挤压过程中可以达到的典型温度 600°C 下，氮化 H13 钢/(Ti0.7Al0.3)N PVD 双涂层与氮化钢和仅涂覆 (Ti0.6Al0.4)N 的钢基体相比表现出令人满意的耐磨性，后者表现出最差的性能。双涂层体系在高温下所观察到的令人满意的耐磨性主要是两个不同方面的结果。首先，由于硬氮化层的存在而具有更高的承载能力，以及高H/E比。这两个参数都允许存在更高的弹性应变，而不会导致陶瓷层失效，这种情况通常发生在直接沉积在 AISI H13 钢上的 TiAlN PVD 涂层的情况下。其次，涂层的固有特性，即其化学成分，可以在磨损轨迹内形成致密的氧化物混合物，从而阻止其进一步氧化和由于氮扩散而导致的机械性能恶化。
The wear resistance of a PVD (Ti0.7Al0.3)N coating deposited on an as-received and gas nitrided AISI H13 has been examined by using ball-on-disc tests at room temperature and at 600°C. In order to determine the influence of a previous heat treatment on this type of steel on the wear resistance of the (Ti0.7Al0.3)N coating, two commercial heat treatments were employed which gave rise to the same substrate hardness. Surface microhardness measurements have been carried out to determine the load-carrying capacity of the coated systems. In general, the wear behavior was found to be independent of the nature of the heat treatment applied to the substrate prior to the nitriding process but strongly dependent on the testing temperature. At room temperature, there were small variations between the different systems tested, whereas at high temperatures, clear differences were found between them. At 600°C, a typical temperature that could be achieved during the aluminum extrusion processes, the nitrided H13 steel/(Ti0.7Al0.3)N PVD duplex coating shows a satisfactory wear resistance compared to both the nitrided steel and the steel substrate only coated with (Ti0.6Al0.4)N, which exhibited the worst performance. The satisfactory wear resistance observed for the duplex coating system at high temperature is mainly a consequence of two different aspects. Firstly, its higher load-carrying capacity due to the existence of a hard nitrided layer, as well as its high H/E ratio. Both parameters allow the presence of higher elastic strains without the failure of the ceramic layer, which would normally occur in the case of TiAlN PVD coatings deposited directly on the AISI H13 steel. Secondly, the intrinsic characteristics of the coating, i.e. its chemical constitution, which allows the formation of a dense oxide mixture inside the wear track that impedes both its further oxidation and the deterioration of the mechanical properties as consequence of nitrogen diffusion.