碳纤维网层内增韧激光表面熔覆原位合成碳化钨层的组织与性能  

Microstructure and Performance of In-situ Synthesized Tungsten Carbide Coating Deposited on Toughened Laser Surface of Carbon Fiber Mesh

作　　者：闫维亮 黄勇[1] 王晟[1] 高玉婷 姚兴中 乔鹏飞 张富邦 YAN Weiliang;HUANG Yong;WANG Sheng;GAO Yuting;YAO Xingzhong;QIAO Pengfei;ZHANG Fubang(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Lanzhou Technology Alloy Powder Co.,Ltd.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工合金粉末有限责任公司,甘肃兰州730050

出　　处：《热加工工艺》2021年第20期105-110,共6页Hot Working Technology

摘　　要：采用激光熔覆原位合成技术,以C、W、Fe及Si等粉末按一定比例均匀混合作为熔覆材料,在Q345B基体上原位反应合成6 mm厚的WC增强型铁基涂层,使用碳纤维网层内增韧。通过XRD、SEM、EDS、显微硬度、冲击韧性和X射线照相法等对熔覆层成分、组织及力学性能等进行研究。结果表明:在适当的工艺参数下,能获得与基体呈冶金结合的基本没有缺陷的熔覆层,其熔覆层内的硬质相主要为WC,还有少量的W_(2)C、Fe_(3)W_(3)C等;其熔覆层的平均硬度值约达到904 HV10,与基体相比硬度大约提高了4~5倍;加入碳纤维网试样的平均冲击韧度值约为78.5 J/cm^(2),相比于未加入碳纤维网试样的冲击韧度提高了39.2%。WC-reinforced iron-based coating with 6 mm thickness was synthesized by laser cladding in-situ technology,using C,W,Fe and Si powders mixed uniformly in a certain proportion as cladding materials on Q345B matrix.The carbon fiber mesh layer was used to toughen the coating.The composition,microstructure and mechanical properties of the cladding layer were studied by XRD,SEM,EDS,microhardness,impact toughness and X-ray photography.The results show that,under the appropriate process parameters,the cladding layer with basically no defects and metallurgical bonding with the substrate can be obtained,and the hard phase in the cladding layer is mainly WC,with a small amount of W_(2)C,Fe_(3)W_(3)C,etc.The average hardness of the cladding layer is about 904 HV10,which is about 4-5 times higher than that of the matrix.According to the impact test results of cladding layer,the average impact toughness of samples with carbon fiber mesh is about 78.5 J/cm^(2),which is 39.2%higher than that of the samples without carbon fiber mesh.

关 键 词：激光熔覆 原位合成 碳纤维网 冲击韧性 硬度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]