激光涂层及多冲后的组织结构变化  

Organization Variety of Laser Cladding Layer under Repeated Impact Load

作　　者：石世宏[1] 傅戈雁[1] 李婷[1] 张金平[1] 

机构地区：[1]苏州大学,苏州215021

出　　处：《中国机械工程》2005年第11期1005-1008,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50271028);湖南省自然科学基金资助项目(02JJY2072)

摘　　要：采用激光熔覆、等离子喷焊、火焰堆焊三种工艺制备抗多冲接触涂层。显微分析表明:激光熔覆层组织致密,晶粒细小,与基体结合牢固,对基体热影响小,稀释率最低;消除裂纹、孔隙、夹杂物等缺陷的覆层成品率最高;激光熔层在其屈服强度20%的多冲载荷下,表层组织混乱,晶粒出现扭曲变形;Co基合金覆层X射线衍射谱相位和峰值强度发生了较大变化;Ni基合金覆层衍射谱没有变化;Fe基合金覆层衍射谱有较小变化。X射线衍射表明,三种涂层下部在多冲前后的衍射谱均无变化。多冲表面有较强的“接触面表面效应”,激光涂层具备良好的表面抗多冲性能。The layers that can resist the repeated impact load had been made using three methods of laser cladding, plasma surfacing and flame bead welding. The micro-analysis shows that the laser cladding layer has dense organization and thin grain. It combines firmly with the substrate and has the smallest hot effect to the substrate and lowest dilution rate as well as highest yield. The surface organization of the layers represents confusion and the grain appears warping under the load about 20% yield strength. While the phase and peak value of X-ray diffraction spectrum generate larger variety to Co-base alloy layer, remain fixed value to Ni-base alloy layer and generate smaller variety to Fe-base alloy layer. But the diffraction spectrum of lower part of the layer has not any variety. The surface bearing repeated impact load has obvious contact surface effect. The laser cladding layer has fine strengthening function resisted the impact load.

关 键 词：激光涂层 多冲载荷 组织结构 表面效应 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG113[金属学及工艺—金属学]