原稿激光熔覆铁基非晶涂层组织硬度及耐磨.doc

豆丁标准与论文网：/week114 - - PAGE 1 - 激光熔覆铁基非晶涂层组织、硬度及耐磨 性能分析 陈桂山，刘宗德，胡卫强 5 （华北电力大学能源动力与机械工程学院，北京 ） 摘要：循环流化床锅炉水冷壁管高温冲蚀磨损是目前阻碍循环流化床锅炉发展所面临的主要 技术难题。现在人们重点研究其磨损机理及有效的防磨措施。本文先分析了循环流化床锅炉 水冷壁管磨损的失效机理，先采用电弧喷涂的方法在 20G 钢管基材上喷涂铁基非晶涂层，再 使用激光多道搭接重熔技术制备得到了耐磨涂层。考察采用激光重熔技术所得到的熔覆层微 10 观组织、显微硬度及高温冲刷腐蚀磨损性能的影响,并与原来的 20G 钢基材对比。试验结果 表明,所得涂层具有很好的耐磨性能，较高的显微硬度。采用激光重熔技术所得到的熔覆层 的表面硬度高达 1200HV,并且熔覆层的硬度是 20G 钢的 6～7 倍，耐高温冲蚀性能为 20G 钢 的 2.5～4 倍。从而对于循环流化床锅炉水冷壁管抗高温冲蚀磨损提供了一个良好的表面技 术方法。 15 关键词：循环流化床锅炉；失效机理；激光熔覆涂层；组织分析；硬度；高温冲蚀磨损 中图分类号：TG178 Microstructure hardness and wear resistance of Fe-based amorphous composite coatings by laser cladding 20 Chen Guishan, Liu Zongde, Hu Weiqiang (Department of energy, power and mechanical engineering, North China electric power university, Beijing ) Abstract: High-temperature wear and corrosion of heated tubes is one of the technical problems confronted by domestic CFB boilers. and now people focus on the wear mechanism and look for 25 effective anti-wear measures. In this thesis, the failure mechanism was studied, and coatings sprayed by arc spraying technology and laser re-melting technology were made had metallurgy combinative property. Experiments such as hardness, wear resistance and high-temperature corrosion microstructure were carried out, at the same time analyzed those experiments. This article shows that: the microstrutures of the coatings are very good wear-resistance performance, 30 higher micro-hardness. the micro-hardness of the coating is up to 1200HV, which is six times higher than that of 20G. the high-temperature corrosion of the coatings 2.5 to 4 times. and has good high temperature erosion wear-resistance. Thus for CFBB water wall tube high temperature resisting erosion wear resistance provides a good surface technology. Keywords: CFBB; failure mechanism; Laser re-melting coating; layer organizational analysis; 35 hardness; high temperature erosion 0 引言 能源和环境问题是当今社会发展必需解决的问题，人们也意识到其在社会发展中的重要 性。全世界都在为经济发展、能源消耗、环境污染之间的矛盾不懈努力。燃煤发电在我国电 40 力发