摘要
以计算机计算Al、Cu及0.06C钢在高应变速率下发生剪切时,在剪切带中的温度分布及冷却速率。结果表明,随着平均应变速率的增加,剪切带中的温度逐渐增高。对于0.06C钢,当平均应变速率达到8×10~5~10~61/s的范围,其绝热剪切白带的组织为马氏体;当平均应变速率大于10~61/s时则是非晶组织。对于Al和Cu,在平均应变速率分别达1.8×10~6和5.5×10~71/s时,可形成非晶的绝热剪切带。由此可见,这三种金属中Cu最难形成绝热剪切带,Al次之,0.06C钢最易形成绝热剪切带。
The temperature distribution under shear with a high strain rate and the cooling rate of the shear bands of Al, Cu and 0.06C steel have been calculated using a computer. The results show that the temperature of shear band increases with the increase of the average strain rate (γ_0). When (?) is in the range 8×10~5 to 10~6s^(-1), the structure of the adiabatic shear band in a 0.06C steel is martensitic but it becomes metallic glass if (?)>=10~6s^(-1). As to Al and Cu, the structure of the adiabatic shear bands can also be one of metallic glass if (?) is greater than 1.8×10~6 and 5.5×10~7s^(-1) respectively. It explains that Cu tends to be the most reluctant to form an adiabatic shear band, while 0.06C steel forms the band most readily among the three metals.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
1990年第4期53-59,共7页
Acta Armamentarii
关键词
金属
剪切
adiabatic shear, shear band, temperature distribution, calculation of cooling rate