Microstructures and wear resistance of chromium coatings on P110 steel fabricated by pack cementation
Microstructures and wear resistance of chromium coatings on P110 steel fabricated by pack cementation
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DOI：
10.1007/s11771-010-0612-3
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发表时间：
2010-12
影响因子：
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通讯作者：
N. Lin;F. Xie;Jun Zhou;T. Zhong;Xiang-qing Wu;W. Tian
中科院分区：
文献类型：
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作者：
N. Lin;F. Xie;Jun Zhou;T. Zhong;Xiang-qing Wu;W. Tian
为了在P110钢表面获得满足油气田环境要求的高性能表面，采用填充渗碳法在P110钢表面制备了铬涂层。添加与不添加La_2O_3的铬层性能不同。采用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(X射线衍射仪)和显微硬度计对涂层的表面形貌、表面元素分布、显微组织、相组成和显微硬度进行了分析。在常温常湿空气中对P110钢基材和涂层进行了摩擦磨损试验。结果表明，无论是否添加La_2O_3，都能在P110钢表面形成均匀、连续的涂层。铬层由Cr23C6、Cr7C3和(Cr，Fe)7C3组成。与不添加La_2O_3的涂层相比，添加La_2O_3的涂层在表面形貌、组织结构、厚度和显微硬度等方面都更有利。渗铬处理显著提高了P110钢的表面硬度和耐磨性。试验样品的耐磨性大小顺序为：La_2O_3涂层>；无稀土涂层>；裸P110钢。
In order to obtain a high-performance surface on P110 steel that can meet the requirements in oil/gas field environment, the chromium coatings were fabricated by pack cementation. The chromium coatings differed in with/without the addition of La2O3. Scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), X-ray diffractometer (XRD) and microhardness tester were employed to investigate the surface morphologies, surface element distributions, microstructures, phase constitutions and microhardness of the coatings. Friction-wear tests of the P110 steel substrate and the coatings were conducted in air at ambient temperature and humidity. The results show that uniform and continuous coatings are formed on P110 steel regardless of adding La2O3or not. The chromium coatings consist of Cr23C6, Cr7C3, and (Cr, Fe)7C3. The La2O3-added chromium coating is more beneficial in terms of surface morphology, microstructure, thickness and microhardness as compared with the coating without adding La2O3. Chromizing treatment significantly improves the surface hardness and wear resistance of the P110 steel. The wear resistance of the tested samples can be sorted in the following sequence: La2O3-coating>no RE-coating>bare P110 steel.