摘要
利用二氧化碳激光器在45钢基体表面上熔覆Ni-WC-CeO_(2)的复合涂层,使用扫描电镜、EDS、显微硬度计、洛氏硬度计,研究CeO_(2)添加量对Ni-WC-CeO_(2)复合涂层宏观形貌、显微组织、元素分布、表面硬度及纵截面显微硬度的影响,以找到最佳的CeO_(2)添加量。CeO_(2)的添加有助于改善涂层宏观形貌、基体和涂层的扩散及浸润性,细化微观组织及WC形貌,提高涂层表面硬度和纵截面显微硬度。CeO_(2)添加量存在一个最佳值:当CeO_(2)添加量为0.3%时,Ni-WC-CeO_(2)复合涂层表面无渣、无裂纹、较小润湿角,宏观形貌最好,从表面到与基体结合处涂层显微组织无枝晶,组织明显细化,Ni-Cr合金与WC间、涂层与基体间的元素发生明显互扩散,碳化钨形貌细化且分布较为均匀,涂层表面硬度最高,所有涂层纵截面显微硬度均呈现中间高两端低的“山形”分布;当CeO_(2)添加量为0.25%时,每组纵截面显微硬度几乎都高于其他CeO_(2)添加量涂层,最高硬度值提高11%。
Ni-WC-CeO_(2) composite coating was obtained on steel 45 substrate by COlaser cladding, the effects of CeO_(2) addition on the macro-morphology, micro-structure, element distribution, surface hardness and longitudinal micro-hardness of Ni-WC-CeO_(2) composite coating were studied by SEM, EDS, micro-hardness tester and Rockwell hardness tester, in order to find the best additive amount of CeO_(2). The addition of CeO_(2) can improve the macro-morphology and diffusion of the coating, at the same time, it can increase the wettability between coating, substrate and refine the micro-structure and WC morphology, and improve the surface hardness and longitudinal section micro-hardness of the coating. When the content of CeO_(2) is 0.3%, there are small wetting angles, but no slag and cracks on the surface of Ni-WC-CeO_(2) composite coating, the macro-morphology is the best, the micro-structure of Ni-WC-CeO_(2) composite coating from the surface to the interface with the substrate has no dendrite and the micro-structure is obviously refined, the elements between Ni-Cr alloy and WC and between the coating and the substrate are obviously interdiffusion, the morphology of tungsten carbide is refined and evenly distributed. the surface hardness of the coating is the highest. When the CeO_(2) content is 0.25%, the microhardness of each longitudinal section is the highest, and the hardness value is increased by 11%.
作者
吴泽华
苗露
冯大庆
吴成举
徐东
WU Ze-hua;MIAO Lu;FENG Da-qing;WU Cheng-jn;XU Dong(Institute of Applied Technology,University of Science and Technology Liaoning,Anshan 114044,China;Quality Department of Science and Technology f Lingyuan Iron&Steel Co.,Ltd.,Chaoyang 122500,China;Department of Manufacturing Management,Angang Steel Co.,Ltd.,Anshan 114021,China;College of Materials Science and Engineer,Hebei University of Engineering,Handan 056038,China;High quality Cold heading steel Technology Innovation Center of Hebei Province,Handan 056038,China)
出处
《稀土》
CAS
CSCD
北大核心
2022年第3期100-110,I0005,共12页
Chinese Rare Earths
基金
河北省钢铁联合基金(E2020402016)
河北省留学基金(C201806)
辽宁科技大学大创项目支持(X202110146312)。
