碳钢表面激光熔覆铁基B4C陶瓷涂层的组织与性能Microstructure and properties of Fe-based alloy and B4C ceramics composite coating on low carbon steel by laser cladding
崔泽琴,王文先,曹国光,刘旭,许并社
摘要(Abstract):
利用5 kW横流连续CO2激光器,采用粉末预置法在Q235钢表面进行了激光熔覆铁基B4C陶瓷涂层的试验研究。通过试验,优化了工艺参数,深入分析了熔覆层的显微组织及相组成,测试了熔覆层显微硬度、耐磨损及耐腐蚀性能。结果表明,铁基B4 C陶瓷复合涂层与基体达到良好的冶金结合,熔覆层组织主要是由短小柱状枝晶与细小的等轴晶组成,其组成相为α-Fe、Fe3 C、Fe3(B,C)、Fe2 B、CrB、Cr23 C6等化合物,熔覆层中还发现未熔的B4 C颗粒。与基体相比,熔覆层显微硬度显著提高,最高可达到1372 HV0.2,约为基体188 HV0.2的7倍;磨损实验表明,熔覆层与基体表面都出现了磨粒磨损特征的犁沟,熔覆层表面磨损的犁沟比基体浅且细密,熔覆层的耐磨性能显著提高。电化学测试结果也表明,熔覆层的耐腐蚀性能也得到了提高。
关键词(KeyWords): 激光熔覆;铁基B4C复合陶瓷涂层;显微组织;耐磨损性能;耐腐蚀性能
基金项目(Foundation): 国家自然科学基金资助项目(50675148);; 山西省自然科学基金资助项目(2008011044)
作者(Author): 崔泽琴,王文先,曹国光,刘旭,许并社
DOI: 10.13289/j.issn.1009-6264.2011.03.027
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