The use of flat-ended projectiles for determining dynamic yield stress III. Changes in microstructure caused by deformation under impact at high-striking velocities
The use of flat-ended projectiles for determining dynamic yield stress III. Changes in microstructure caused by deformation under impact at high-striking velocities
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使用平头弹丸测定动态屈服应力 III．
DOI：
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发表时间：
1948
期刊：
影响因子：
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通讯作者：
M. L. V. Gayler
中科院分区：
文献类型：
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作者：
W. Carrington;M. L. V. Gayler
通过观察硬度相似的低碳钢、硬铝和标准银（成分为Ag 92.5%, Cu 7.5%）的圆柱体和钢球以300 ~ 3830英尺/秒的速度撞击钢板后的显微组织，研究了金属在高速下的变形机理。减轻冲击应力的方法取决于材料，首先是孪生体或“压缩带”的形成，即通过单个颗粒内材料楔块的块状运动，或通过开裂。当外加应力不能再以这种方式释放时，就会发生塑性变形。通过观察变形低碳钢和硬铝退火后组织的变化，研究了变形低碳钢和硬铝的残余应变量。对圆柱体的纵截面进行了硬度测量，硬度测量结果与显微组织和冲击应变极限的观察结果相关联。
The mechanism of deformation of metals at high velocities has been studied by examining the microstructure of cylinders of mild steel, duralumin and standard silver (of composition Ag 92.5%, Cu 7.5%) of similar hardness, and of steel balls after impact on steel plates at velocities from 300 to 3830 ft. /sec. The means by which the stress on impact was relieved depended on the material, and was first the formation of twins or ‘compression bands’, i. e. by block movement of wedges of material within individual grains, or by cracking. When the applied stress could no longer be relieved in this way, plastic deformation occurred. The amount of residual strain in deformed mild steel and duralumin has been examined by observing changes of microstructure after annealing. Hardness surveys were made on longitudinal sections of the cylinders and the results correlated with the microstructures and with observations of the limits of strain due to impact.