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首页> 外文期刊>Applied Surface Science >Modification of tribology and high-temperature behavior of Ti-48Al-2Cr-2Nb intermetallic alloy by laser cladding
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Modification of tribology and high-temperature behavior of Ti-48Al-2Cr-2Nb intermetallic alloy by laser cladding

机译：激光熔覆Ti-48Al-2Cr-2Nb金属间合金的摩擦学和高温行为

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摘要

In order to improve the tribology and high-temperature oxidation properties of the Ti-48AL-2Cr-2Nb intermetallic alloy simultaneously, mixed NiCr-Cr3C2 precursor powders had been investigated for laser cladding treatment to modify wear and high-temperature oxidation resistance of the material. The alloy samples were pre-placed with NiCr-80, 50 and 20%Cr3C2 (wt.%), respectively, and laser treated at the same parameters, i.e., laser output power 2.8 kW, beam scanning speed 2.0 mm/s, beam dimension 1 mm x 18 mm. The treated samples underwent tests of microhardness, wear and high-temperature oxidation. The results showed that laser cladding with different constitution of mixed precursor NiCr-Cr3C2 powders improved surface hardness in all cases. Laser cladding with NiCr-50%Cr3C2 resulted in the best modification of tribology and high-temperature oxidation behavior. X-ray diffraction (XRD), optical microscope (OM), scanning electron microscopy (SEM) and energy-dispersive spectrometer (EDS) analyses indicated that the formation of reinforced Cr7C3, TiC and both continuous and dense Al2O3, Cr2O3 oxide scales were supposed to be responsible for the modification of the relevant properties. As a result, the present work had laid beneficial surface engineering foundation for TiAl alloy applied as future light weight and high-temperature structural candidate materials. (c) 2005 Elsevier B.V. All rights reserved.
机译：为了同时改善Ti-48AL-2Cr-2Nb金属间合金的摩擦学性能和高温氧化性能，研究了混合NiCr-Cr3C2前驱体粉末进行激光熔覆处理，以改善材料的耐磨性和高温抗氧化性。 。分别用NiCr-80、50％和20％Cr3C2（wt。％）预先放置合金样品，并在相同的参数下进行激光处理，即激光输出功率2.8 kW，光束扫描速度2.0 mm / s，光束尺寸1毫米x 18毫米。处理过的样品经受了显微硬度，磨损和高温氧化的测试。结果表明，在所有情况下，采用不同成分的混合前驱体NiCr-Cr3C2粉末进行激光熔覆均可以改善表面硬度。用NiCr-50％Cr3C2进行激光熔覆可以使摩擦学和高温氧化性能得到最佳的改善。 X射线衍射（XRD），光学显微镜（OM），扫描电子显微镜（SEM）和能量分散光谱仪（EDS）分析表明，假定形成了增强的Cr7C3，TiC以及连续且致密的Al2O3，Cr2O3氧化皮负责相关属性的修改。结果，目前的工作为将来用作轻质和高温结构候选材料的TiAl合金奠定了有益的表面工程基础。 （c）2005 Elsevier B.V.保留所有权利。

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