Sen YANG
,
Wenjin LIU
,
Minlin ZHONG
,
null
,
null
材料科学技术（英文）
A Ni-base alloy composite coating reinforced with TiC particles of various shapes and sizes on medium carbon steel substrate was produced by multilayer laser cladding. The chemical compositions, microstructures and surface morphology of the cladded layer were analyzed using energy dispersive X-ray spectroscopy (EDX), scanning electron microscope (SEM), and X-ray diffractometry (XRD). The experimental results showed that an excellent metallurgical bonding between the coating and the substrate was obtained. The microstructure of the coating was mainly composed of γ-Ni dendrites, a small amount of CrB, Ni3B, M23C6 and dispersed TiC particles. Much more and larger TiC particles formed in the overlapping zone, which led to a slightly higher microhardness of this zone. The maximum microhardness of the coating was about HV0.21200. The effects of the laser processing parameters on the microstructures and properties of coating were also investigated.
关键词:
Laser cladding
,
null
,
null
,
null
王秋林
,
李斌
,
朱金波
,
高新红
,
周青
,
赵龙志
材料开发与应用
本文采用超声辅助制备Al-Cr/Al原位复合材料.利用XRD、EDS对复合材料进行物相分析,应用扫描电镜观察增强体颗粒的大小、形貌和分布,并研究了复合材料的耐腐蚀性.结果表明,通过超声辅助制备的Al-Cr/Al原位复合材料中增强体颗粒呈多边形,尺寸细小,分布均匀;Al和Cr在高温下反应生成金属间化合物,这些金属间化合物会相互扩散,形成均匀的混合增强相;Al-Cr金属间化合物具有良好的耐腐蚀性,打断了基体的连续性,对腐蚀的深入和扩展有很强的抑制作用.复合材料的耐腐蚀性与增强体颗粒的含量、分布有关.
关键词:
铝基复合材料
,
超声
,
原位合成
,
显微组织
,
耐腐蚀性
