9CrSi钢表面激光合金化的组织与性能Microstructure and properties of 9CrSi steel by laser surface alloying
王文焱,董晓明,徐晶,谢敬佩
摘要(Abstract):
以亚微米级WC/Co金属陶瓷复合材料为涂层材料,采用激光合金化技术在9CrSi表面制备出硬度高、耐磨的合金化层。利用扫描电子显微镜(SEM),X射线衍射仪(XRD)等分析测试手段对激光合金化层的显微组织和物相构成进行了分析,并对合金化层进行了硬度和摩擦性能测试。结果表明,激光合金化层与基材形成了良好的冶金结合。激光合金化层可分为合金化区,热影响区和基体区三部分。其中合金化区组织为基体马氏体上分布着网状枝晶碳化物,网状枝晶间弥散分布着碳化物小颗粒,热影响区组织由马氏体及残留奥氏体组成,基体区组织无明显变化。合金化层的显微硬度达到900HV0.2,干摩擦条件下材料磨损量是基材9CrSi的1/9,合金化涂层的耐磨性得到显著的提高。
关键词(KeyWords): 激光合金化;9CrSi钢;显微组织;显微硬度;耐磨性
基金项目(Foundation): 河南省杰出人才创新基金资助项目(0621000600);; 河南省教育厅自然科学研究项目(2007430003);; 河南科技大学科学研究基金项(2007zy044)
作者(Author): 王文焱,董晓明,徐晶,谢敬佩
DOI: 10.13289/j.issn.1009-6264.2010.08.022
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