45钢在超细SiC颗粒作用下的正向冲蚀行为

Erosion Behaviors of 45 Steel by Ultrafine SiC Particles Under Normal Impact Condition

选用超细SiC颗粒作为磨料,研究了韧性材料45钢在正向冲击条件下的冲蚀行为并与7075-T6铝合金对比。使用高强度磁铁捕获了45钢冲蚀磨屑,利用扫描电子显微镜(SEM)对冲蚀磨损后试样表面以及磨屑形貌进行观测;采用质量分析法,分析45钢在不同冲蚀条件下的失重情况与材料去除率;利用X射线应力测定仪,分析45钢在不同冲蚀条件下的表层及深度方向的残余压应力分布情况。结果表明,正向冲击条件下,韧性材料表面主要发生塑性变形,偏向堆积脊部还存在片层剥落的材料去除形式,超细磨料产生的材料去除率相对较小,材料去除率随磨料量的增加呈先增加后减小的趋势;表层应力随磨料量呈先增加后降低的趋势,微磨料冲蚀残余压应力的影响深度约为10μm。

This paper studies the erosion behaviors of ductile materials such as 45 steel and 7075-T6 alumi- num alloy impacted by ultrafine SiC particles. Abrasive dusts of 45 steel were captured by magnet. Abrasive dusts and the eroded surfaces of 45 steel and 7075 T6 aluminum alloy were observed by scanning electron mi- croscopy （SEM）. The weight loss of 45 steel was measured, and the variance of erosion rate under different conditions was analyzed to give a clear understanding of the solid particle erosion of ductile material. X ray diffraction method was adopted to measure and analyze the compressive residual stress on the surface and along the depth. Results show that deformation dominates the eroded surface and deformation level is related to the hardness of the target surface. The abrasive dusts are extruded by successive impact of the particle. The ero- sion rate caused by ultrafine SiC particles is found to be relatively small, and the erosion rate increases with in creasing SiC particles amount, and then decreases. The surface residual stress caused by ultrafine SiC increa- ses with increasing SiC particles amount, and then decreases. The influence depth of compressive residual stress caused by ultrafine SiC particles is about 10 μm.