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Investigation of the Mechanical and Tribological Properties of Plasma Nitrided Layers on Tool Steel

机译：钢管钢等离子体氮化层机械和摩擦学性能研究

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Plasma nitriding has recently been proved to enhance the tribological properties of cutting tool steels. However, detailed investigation of mechanical properties correlated to microstructure of nitrided layer is needed to develop the scientific understanding and to further optimize the processes, thus fully realizing the potential of plasma nitriding in enhancing the performance and extending the life of cutting tools. In the present paper different types of nitrided layers on AISI M2 high speed steel has been investigated employing X-ray diffraction, glow discharge optical spectrometry, scanning and transmission electron microscopy, optical microscopy, residual stress analysis, nanoindentation, microhardness and wear tests. Compound layer has resulted in sensible reduction of friction coefficient of the tribopair. However, the same was not observed for diffusion layer. Furthermore, it was possible to produce compound layer with adequate mechanical properties since low temperature treatment was selected. It was possible to observe that a significant decrease in the mechanical properties occurred in the diffusion layer for nitrided layer processed at high temperature. The results suggest the formation of cracks and micro-maclas (twins) as a mechanism for stress relaxations in brittle nitrided layers.
机译：最近已经证明等离子氮化以增强切割工具钢的摩擦学特性。然而，需要详细研究与氮化层的微观结构相关的机械性能，以发展科学的理解，并进一步优化工艺，从而充分实现等离子体氮化在提高性能和延长切割工具寿命方面的潜力。在本文的纸张中，AISI M2高速钢上的不同类型的氮化层采用X射线衍射，辉光放电光谱光谱，扫描和透射电子显微镜，光学显微镜，残余应力分析，纳米狭窄，微硬度和磨损试验。复合层导致摩擦系数的显着降低了摩托车的摩擦系数。然而，扩散层未观察到相同。此外，由于选择了低温处理，可以产生具有足够机械性能的复合层。可以观察到，在高温下处理的氮化层的扩散层中发生机械性能的显着降低。结果表明裂缝和微观 - Maclas（双胞胎）的形成作为脆性氮化层中应力松弛的机制。

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