New evaluation of critical strain for internal crack formation in continuous casting
New evaluation of critical strain for internal crack formation in continuous casting
复制标题
DOI：
10.1051/metal/199289070627
复制
发表时间：
1992-07
影响因子：
--
通讯作者：
A. Yamanaka;K. Nakajima;K. Yasumoto;H. Kawashima;K. Nakai
中科院分区：
文献类型：
--
作者：
A. Yamanaka;K. Nakajima;K. Yasumoto;H. Kawashima;K. Nakai
为了确定内裂纹形成的临界条件，进行了圆柱形液芯铸锭的拉伸试验。结果表明，在0. 99 ~ 0. 80的固相分数范围内（分别对应于零塑性温度（ZDT）和零强度温度（ZST）），只有当该范围内的应变超过临界值（1. 6%）时，才会发生内部开裂。该临界值不受应变速率和变形方式的影响。在较低的应变速率下，当应变超过ZDT和ZST之间的临界值时，裂纹随凝固进程而延长。提出了连铸坯内裂纹形成应变的新评价方法.
In order to determine the critical conditions for internal crack formation, tensile tests of cylindrical ingots with liquid core have been carried out. It was found that internal cracking occurred in the solid-fraction range between 0.99 and 0.80 corresponding to zero ductility temperature (ZDT) and zero strength temperature (ZST) respectively, only when strain given in this range exceeded critical value (1.6 %). This critical value was not influenced by strain rate and manner of deformation. At a lower strain rate, successive strain which exceeded the critical value between ZDT and ZST made the cracks longer with solidification progress. New evaluation of strain for internal crack formation in a continuous casting strand was found out.