By the directional solidification of metal-gas eutectic method（GASAR）,porous Cu-Mn alloy with oriented pores was fabricated *** variation of pore structure was studied by *** results show that the pore structure is ...
详细信息
By the directional solidification of metal-gas eutectic method（GASAR）,porous Cu-Mn alloy with oriented pores was fabricated *** variation of pore structure was studied by *** results show that the pore structure is primarily dependent on the solidification mode（planar,columnar cellular,columnar dendritic,equiaxed dendritic）,which is controlled by the solidification *** numerical simulation,it is noted that along with solidification,the solidification mode of the alloy transforms from cellular to columnar dendritic and finally to equiaxed *** increasing melt temperature and mold preheating,the range of equiaxed dendrite could be decreased,which helps to extend the region of oriented pore structure.
研究AZ31B镁合金轧制道次间不同退火温度和时间对板材微观组织和力学性能的影响,分析了拉伸试样断口形貌.实验结果表明,退火处理后镁合金板材由轧制纤维组织转变为均匀等轴的再结晶组织,退火再结晶的起始温度为200℃;退火后的力学性能得到一定程度的恢复,硬度、屈服强度最大降幅分别为25.4%和37.1%,伸长率最大增幅达31.3%,拉伸断口由解理和韧窝混合断口转变为典型韧性断口.实验得到镁合金中间退火的较佳工艺为:退火温度300～320℃,退火时间60～120 min.
利用激光结构光进行焊缝跟踪时,在存在强弧光干扰的情况下稳定地获取跟踪信息是非常关键一个问题。采用模板匹配的方法实时地计算得到当前图像中的感兴趣区域,并且利用重心法结合改进的一维K a lm an滤波的方法准确的提取出强弧光干扰...
详细信息
利用激光结构光进行焊缝跟踪时,在存在强弧光干扰的情况下稳定地获取跟踪信息是非常关键一个问题。采用模板匹配的方法实时地计算得到当前图像中的感兴趣区域,并且利用重心法结合改进的一维K a lm an滤波的方法准确的提取出强弧光干扰下感兴趣区域内激光结构光的中心线,最后利用中心线上各点的横坐标计算加权系数对纵坐标进行加权累积,稳定并且准确地获得了能够体现出整条结构光变化的跟踪点信息。实验表明,该文提出的算法具有很强的抗干扰能力,可以在实际的焊缝跟踪系统中得到应用。
暂无评论