摘要
利用Gleeble-1500型热模拟试验机研究了粉冶金属钼在应变速率为0.01～10s-1,变形温度为900～1450℃条件下的热加工性能。并根据试验结果对粉冶金属钼的动态再结晶行为进行了研究,建立了其θ-σ和θ/σ-σ曲线,并依据应变硬化率θ与应力和应变的关系曲线确定了粉冶金属钼发生动态再结晶的临界应变εc;最后确定出金属钼动态再结晶平均晶粒尺寸D与Z参数的关系为:lnD=3.65597–0.05409lnZ,为粉冶金属钼的开坯与热加工工艺制定提供了基础。
Hot workability of powder metallurgy molybdenum in the temperature range of 900-1450 oC and strain rate range of 0.01-10 s-1 was investigated by hot compression tests on a Gleeble-1500 thermal mechanical simulator. According to experimental results, the dynamic recrystallization （DRX） behavior of powder metallurgy molybdenum was studied and its θ-σ and θ/σ-σ curves were established. Based on working hardening rate-stress （θ-σ） and working hardening rate-strain （θ-ε） curves, the critical strain εc of DRX was determined. The average grain size （D） and Zener-Hollmon parameter （Z） during DRX process obey the following equation： lnD=3.65597–0.05409lnZ; these researches provide fundamental data for cogging and hot working technology of powder metallurgy molybdenum.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第4期669-672,共4页
Rare Metal Materials and Engineering
关键词
金属钼
动态再结晶
临界应变
晶粒尺寸
molybdenum
dynamic recrystallization
critical strain
grain size
