摘要
在热模拟机上对AerMet100超高强度钢进行了恒温和恒应变速率的热压缩实验,温度范围是900℃～1100℃,应变速率范围是0.01s-1～10s-1。实测了高温下应力-应变关系曲线,观察了变形后的显微组织,计算了材料的激活能,并建立了峰值应力与变形温度和应变速率的关系。结果表明,材料的流动应力随着变形温度的升高而降低,随应变速率的增大而增大;材料在不同变形条件下其软化机制分别受动态回复和动态再结晶控制;在实验条件范围内,AerMet100超高强度钢的再结晶温度在1000℃～1050℃之间,材料的热变形激活能为261.2kJ/mol。
Hot compression tests of AerMet100 alloy were studied on Gleeble Simulator at constant temperatures and constant strain rates. The ranges of temperature and strain rates were 700°C^1000°C and 0.01 s-1~10 s-1. The true compressive stress v. s. true strain curves had been measured and the hot deformation microstructures were observed. The activation energy of deformation was calculated and the relationship among peak stress and deformation temperature and strain rate was established. The results showed that the flow stress decreased with deformation temperature rising and increases with strain rate growing. The softening mechanism was dominated by dynamic recovery and dynamic recrystallization at different conditions. The temperature of re-crystallization was at between 1000°C^1050°C within the experiment range. The activation energy of deformation was 261.2 kJ/mol.
出处
《塑性工程学报》
EI
CAS
CSCD
北大核心
2007年第6期121-126,共6页
Journal of Plasticity Engineering
