Investigations Regarding Electron Beam Surface Remelting of Plasma Nitrided Spray-Formed Hypereutectic Al-Si Alloy
Investigations Regarding Electron Beam Surface Remelting of Plasma Nitrided Spray-Formed Hypereutectic Al-Si Alloy
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DOI：
10.1002/adem.201800244
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发表时间：
2018-09-01
影响因子：
3.6
通讯作者：
Buchwalder, Anja
中科院分区：
文献类型：
--
作者：
Hegelmann, Eugen;Jung, Anne;Buchwalder, Anja
等离子体氮化铝合金是一种合适的方法，以提高耐磨性，因为硬质陶瓷氮化铝层形成。然而，铝基材料的低硬度极大地限制了表面的承载行为。关于改善负载支持薄氮化铝层的新的调查研究氮化和随后的EB重熔的处理顺序。由于其含有广泛的有益合金元素（Si、Fe、Cu、Mg），因此使用通过喷射成形制成的过共晶Al-Si合金（DISPAL（R）S232）作为基础材料。电子束重熔过程是在氮化层厚度约为100 μ m的样品上进行的。3 μ m。由于新形成的相、晶粒细化和铝固溶体的过饱和，氮化物层下方的表面硬度与初始基材相比可以增加多达三倍。通过使用销盘配置的无润滑磨损试验和恒定载荷条件下的划痕试验来评估负载支持的估计增强。此外，磨损机制进行了研究，通过详细的扫描电镜检查重熔表面层。
Plasma nitriding of aluminum alloys is a suitable method for improving wear resistance because of the hard ceramic AlN layer formed. However, the surface's load-bearing behavior is greatly limited by the low hardness of the Al base material. New investigations regarding improved load support of the thin AIN layer examine the treatment sequence of nitriding and subsequent EB remelting. Because of its broad range of beneficial alloying elements (Si, Fe, Cu, Mg), a hypereutectic Al-Si alloy (DISPAL (R) S232) - made by spray forming - was used as the base material. The electron beam remelting process is carried out on samples with a nitride layer thickness of approx. 3 mu m. As a result of the newly formed phases, grain refinement, and oversaturation of the aluminum solid solution, the surface hardness beneath the nitride layer can be increased by up to three times compared to that of the initial base material. The estimated enhancement in load support is evaluated by unlubricated wear tests using a pin-on-disc configuration and scratch tests under constant loading conditions. Furthermore, the wear mechanisms are investigated by means of detailed SEM examination of the remelted surface layer.