王开明,雷永平,魏世忠,符寒光,杨勇维,李玉龙,苏振清

• 1:北京工业大学材料科学与工程学院
• 2:北京首钢机电有限公司

摘要(Abstract)：

利用6 kW光纤激光器在Q235钢表面激光熔覆Ni基WC复合涂层。使用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、显微硬度计和磨损试验机,研究了不同WC颗粒含量下熔覆层组织形态、成分、显微硬度和磨损性能的变化规律。结果表明:熔覆层的稀释率随着WC含量的增加先减小后增加,当WC含量为20%时,稀释率最小。在光纤激光熔覆Ni基WC复合涂层的过程中,WC颗粒部分发生溶解并与其他元素相互作用形成共晶物,析出后分别以条状、块状和粒状等形态存在,随着WC含量的增加,熔覆层的组织出现细化现象。含WC的熔覆层组织中主要有γ-Ni、M_7C_3、M_(23)C_6、CrB、WC和W_2C等相存在。随着WC含量增加,熔覆层硬度增加,当WC质量分数达到40%时,熔覆层硬度可达到基体硬度的5倍以上。当WC的相对质量分数为20%时,熔覆层耐磨性能最好,耐磨性为Ni60A涂层的3倍以上。

关键词(KeyWords)： 光纤激光熔覆;Ni基WC合金;显微组织;硬度;耐磨性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51275006,51274016);; 北京市自然科学基金(2142009)

作者(Author): 王开明,雷永平,魏世忠,符寒光,杨勇维,李玉龙,苏振清

DOI: 10.13289/j.issn.1009-6264.2016.07.028

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