王传琦,刘洪喜,周荣,张晓伟,曾维华,蒋业华

• 1:昆明理工大学材料科学与工程学院

摘要(Abstract)：

利用6 kW多模横流CO2激光器在45钢表面熔覆了Ni60CuMoW合金粉末,并对熔覆涂层进行了回火处理。通过OM、XRD、SEM、EDS和电化学综合测试系统等手段分析了激光功率和回火复合处理对熔覆层组织和耐蚀性能的影响。结果表明:熔覆层与基体呈良好的冶金结合,熔覆层组织致密。熔覆层主要由富含Ni的基体相γ(Ni,Fe)、固溶体(Ni,Cu)、化合物Ni31Si12、BCr、Cr5 B3、BNi3、FeNi3和M23 C6(M=Cr、Ni、Fe)等组成。随着激光功率的增加,熔覆层与基体间的过渡区域更加平滑。试样耐蚀性随激光功率的降低而增强,腐蚀电位明显正移,腐蚀电流密度降低近2个数量级。对单道涂层试样,回火处理后的耐蚀性好于回火前,而多道熔覆层的耐腐蚀性又优于单道。

关键词(KeyWords)： 激光熔覆;回火处理;多道涂层;微观组织;耐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50671045);; 云南省自然科学基金(2008ZC021M);; 昆明理工大学分析测试基金(2009-022)

作者(Author): 王传琦,刘洪喜,周荣,张晓伟,曾维华,蒋业华

DOI: 10.13289/j.issn.1009-6264.2011.07.028

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