Effect of Y2O3 on microstructure and property of laser surface alloying on 40Cr steel
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摘要: 为了改善金属卷筒的组织性能,采用Mo+Y2O3制成合金粉末,将粘接剂均匀涂覆在40Cr钢基材表面,用CO2激光器对材料表面进行了激光合金化处理。利用扫描电子显微镜、X射线衍射仪、显微硬度计、磨损试验机研究了Mo+Y2O3对合金化层的硬度、耐磨性、组织结构、形成机理的影响。结果表明,在加入稀土氧化物Y2O3后,合金层晶粒显著细化,晶界得到强化,增加了显微组织的均匀性、致密性,硬度、耐磨性得到显著提高,有利于提高金属卷筒表面的硬度和耐磨性。Abstract: Mo+Y2O3 alloy powders were used to coat uniformly on the surface of 40Cr steel roller substrates by adhesive for the laser surface alloying treatment by a continuous wave CO2 laser in order to improve the organizational performance of the metal rollers. The effect of the rare earth oxide to the alloy layer on the hardness, wearing resistance, microstructure, and formation mechanism was studied with a scanning electron microscope, X-ray diffractometer, micro-hardness tester, and a wearing tester. Many good consequences were obtained after adding the rare earth oxide Y2O3. The crystal grains of the alloy layer were significantly refined. The boundary of crystal grains was strengthened. The uniformity and density of the microstructure were increased. The hardness and wearing resistance the alloy layer were considerably improved. The results show that it helps to improve the surface hardness and wear resistance of metal rollers
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Keywords:
- laser technique /
- 40Cr steel /
- laser surface alloying /
- rare earth oxide Y2O3
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