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以W粉、C粉和Ni60A粉为原料,采用氩弧熔覆工艺在Q235钢基体上制备出原位自生(Fe,W,Cr)23C6增强Ni基复合熔覆层。借助扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计及滑动磨损试验机对复合熔覆层的显微组织、硬度、耐磨性进行了研究。结果表明,熔覆层与基体呈冶金结合,无裂纹、气孔等缺陷,涂层显微硬度的最大可达1213HV,耐磨性比Q235钢提高18倍,在室温干滑动磨损试验条件下具有优异的耐磨损性能。工业试验表明使用该技术在16D、24D叶轮表面制备的耐磨熔覆层,可使其使用寿命提高3倍以上。
In-situ (Fe, W, Cr) 23C6 reinforced Ni-based composite coatings were prepared on Q235 steel substrate by using W powder, C powder and Ni60A powder as raw materials. The microstructure, hardness and wear resistance of the composite cladding layer were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness tester and sliding wear tester. The results show that the cladding layer is metallurgically bonded with the substrate without any defects such as cracks and pores. The maximum hardness of the coating can reach 1213 HV and the wear resistance is 18 times higher than that of Q235 steel. It has excellent properties under dry sliding wear test at room temperature Wear resistance. Industrial tests show that the use of this technology in the 16D, 24D impeller wear-resistant coating surface, can make its service life more than 3 times.