Q345钢两相流冲蚀实验研究

Experimental research on erosion of Q345 steel under two-phase flow condition

冲蚀磨损广泛存在于民用、工业、军工等领域中,常导致设备受颗粒撞击形成不同程度的损伤。选用Q345钢开展液固两相流冲蚀实验,基于失重法和表面分析技术研究颗粒粒径、颗粒质量分数、冲蚀角度(15°~90°)、冲蚀时间等因素对冲蚀磨损的影响,并对冲蚀后的样品表面形貌特征进行分区。实验结果表明:随颗粒质量分数增大,冲蚀失重量上升的速率逐渐趋于平缓;3D形貌观测发现,颗粒质量分数高于0.1%后,材料表面全部受到了侵蚀,最大冲蚀深度降低;30°冲蚀角度附近Q345钢的质量损失最大,这与其较强的韧塑性有关。基于金相显微拍照分析,90°射流冲击后样品表面分成3个区域,靠近喷嘴外边缘的2区内坑洞和犁沟数量最多,损伤最为严重,这与射流流场特性和颗粒分布有关。

Erosion is a common occurrence in the civic,industrial,military,and other sectors,and it frequently results in equipment being struck by particles and suffering varied degrees of damage.This paper selects Q345 steel to carry out the erosion experiment under the liquid-solid two-phase flow condition.Based on the weight loss method and surface analysis technology,the effect of particle size,particle concentration,erosion angle(15°-90°),erosion time and other factors on erosion were studied.And the morphological characteristics of the surface of the sample after the erosion were partitioned.The experimental results show that as the particle mass concentration increases,the rate of erosion weight loss gradually tends to be flat.3D morphological observation found that after the concentration was higher than 0.01%,all of the material surface was eroded,and the maximum erosion depth was reduced.Q345 steel has the largest mass loss near the 30°attack angle,which is related to its strong toughness and plasticity.Based on the analysis of metallographic microscopy,the sample surface is divided into three zones after the 90°jet impact.The 2 zones near the outer edge of the nozzle have the largest number of pits and furrows and the most serious damage,which is related to the characteristics of the jet flow field and particle distribution.