摘要
为研究建筑用高强度低合金钢在高温低应变速率下塑性变差的原因,分析了304与446不锈钢在不同应变速率下收缩率随温度的变化,计算钢材中P原子的临界时间与等效时间并量化应变速率对两种钢材热塑性的作用。结果表明,溶质原子的非平衡晶界偏聚是导致304和446不锈钢的热塑性变差的原因,且分别在850和800℃时晶界偏聚程度最大,塑性最小。处于偏聚阶段时,钢材的偏聚程度增大,塑性降低。
In order to study the causes of decreasing plasticity of high-strength low-alloy steels at high temperature and low strain rate conditions,the changes of shrinkage rate of 304 and 446 steels at different strain rates and different temperatures were analyzed.Meanwhile,the critical time and the equivalent time of P atom in the test steels were also calculated.The results show that the non-equilibrium grain boundary segregation of solute atoms is the main reason for low plasticity of the test steels.The 304 and 446 steels have the largest segregation with the lowest plasticity at 850 ℃and 800 ℃,respectively.During segregation,the increase of segregation degree will lead to a decrease of plasticity of the steel.
出处
《铸造技术》
CAS
北大核心
2016年第10期2078-2080,共3页
Foundry Technology
关键词
热塑性
晶界偏聚
应变速率
thermal plasticity
grain boundary segregation
strain rate
