A.L. Fan
,
W.H. Tian
,
Q. Sun
,
B.S. Wang
金属学报(英文版)
The microstructures of electroformed copper liners of shaped charges that had undergone high-strain-rate deformation were observed by optical microscopy (OM) and scanning electron microscopy (SEM). Meanwhile, the orientation distribution of the grains in the recovered jet was examined by electron backscattering Kikuchi pattern (EBSP) technique. EBSP analysis reveals that the fibrous texture observed in the as-electroformed copper liners disappeared after explosive detonation deformation. OM observation shows that the microstructure evolves systematically from the jet center to its perimeter during cooling from high temperatures after explosive detonation deformation. This microstructural characteristic is similar to that of solidification, i.e. there exist equiaxed grains in the center of the jet and significant columnar grains around the equiaxed grains. The result reveals that there is melting-related phenomenon in the jet center. Corresponding microhardness variations from the jet center to its perimeter is also determined. All the phenomena can be explained by a strong gradient of temperature across the section of the jet during plastic deformation at high-strain-rate.
关键词:
jetting
,
null
,
null
于静
,
刘红
,
解茂昭
,
王德庆
工程热物理学报
应用欧拉-欧拉双流体模型,与动网格技术相耦合数值分析往复搅拌流场中气体射流两相流的流动特性及气泡在往复流场内的分布规律。通过调整过程中吹气头的往复运动频率、气体射流速度来分析这些因素对于气泡分布和流场流动特性的影响。数值模拟结果表明,往复搅拌流场中气体射流两相流呈现与搅拌频率一致的周期性,气泡分布随吹气头位置的移动呈螺旋上升规律。
关键词:
两相流
,
欧拉-欧拉双流体模型
,
射流
,
数值模拟
,
气泡分布
张良进
,
龙跃
,
李智慧
,
杜培培
材料与冶金学报
doi:10.14186/j.cnki.1671-6620.2016.01.004
采用调质高炉渣进行喷吹法制备矿渣棉试验，对喷吹试验所得纤维的表观特性及性能进行检测，探索喷吹工艺参数对纤维质量的影响规律.结果表明：高炉渣的成分含量不在形成矿渣棉的成分范围内，应该添加调质剂对高炉渣作调质处理；随着酸度系数的增加，纤维直径呈增长趋势；当酸度系数在1.0~1.2时纤维含水率变化不大，在1.3时含水率出现谷值，随后迅速增大；在黏度允许的范围内，气流速度越大，纤维越细长.采用喷吹工艺制备矿渣棉高炉渣酸度系数控制在1.2~1.3之间，喷吹气体压力控制在0.3 MPa左右，纤维质量较好.
关键词:
高炉渣
,
矿渣棉
,
喷吹
,
酸度系数
,
压力
