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首页> 美国卫生研究院文献>Materials >Effects of CTCP Modification on Microstructure and Wear Behavior of CTCP-NiCrBSi/Heat Resistant Steel Composite Layer
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Effects of CTCP Modification on Microstructure and Wear Behavior of CTCP-NiCrBSi/Heat Resistant Steel Composite Layer

机译：CTCP改性对CTCP-NiCrBSi /耐热钢复合层组织和磨损行为的影响

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摘要

A CTCP-NiCrBSi/heat resistant steel composite layer was designed and fabricated by vacuum fusion sintering. The structure of the composite layer was similar to reinforced concrete. Numerous reinforced regions with a cylindrical shape were evenly distributed in the heat resistant steel. Modified cast tungsten carbide particles (CTCP) reinforced NiCrBSi matrix composite constituted the reinforced region (CTCP-NiCrBSi). The microstructure of the composite layers was investigated by scanning electron microscope (SEM), energy dispersive x-ray spectrometer (EDS), and image analysis. The wear behavior of the composite layer was estimated on the ring-on-disc rig at a temperature range of room temperature (RT) to 800 °C in air. The microstructure and wear behavior of the composite layer with modified CTCP were compared with those with primary CTCP. The results showed that the poor chemical resistance of W2C and the interdiffusion of elements were responsible for the dissolution of unmodified CTCP in the molten NiCrBSi alloy. A WC outer shell formed on the surface of the CTCP after surface carburizing modification. The WC outer shell could effectively resist the dissolution of CTCP in NiCrBSi during the sintering process. The content of WC/W2C in modified CTCP-NiCrBSi increased by about 12.0 vol. % when compared with that in the primary CTCP-NiCrBSi. The wear rate of the composite layer with modified CTCP was lower than that with primary CTCP between RT and 700 °C. The wear rates of the composite layer decreased with increasing temperature from RT to 700 °C and increased above 700 °C.
机译：通过真空熔融烧结设计和制备了CTCP-NiCrBSi /耐热钢复合层。复合层的结构类似于钢筋混凝土。在耐热钢中均匀分布有许多圆柱状的增强区域。改性铸造碳化钨颗粒（CTCP）增强的NiCrBSi基复合材料构成了增强区（CTCP-NiCrBSi）。通过扫描电子显微镜（SEM），能量色散X射线光谱仪（EDS）和图像分析研究了复合层的微观结构。复合材料层的磨损行为是在圆盘式钻机上在室温（RT）到800°C的空气温度范围内估算的。比较了采用改性CTCP的复合层与采用原始CTCP的复合层的微观结构和磨损行为。结果表明，W2C的耐化学性差以及元素之间的相互扩散是造成未改性的CTCP在熔融NiCrBSi合金中溶解的原因。表面渗碳改性后在CTCP的表面上形成WC外壳。在烧结过程中，WC外壳可以有效抵抗CTCP在NiCrBSi中的溶解。改性CTCP-NiCrBSi中WC / W2C的含量增加了约12.0 vol。与主要CTCP-NiCrBSi中的百分比相比。在RT和700°C之间，具有改性CTCP的复合层的磨损率低于具有初级CTCP的复合层的磨损率。复合层的磨损率随温度从室温升高到700°C而降低，而在700°C以上则增加。

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