基于热加工图的钼金属热变形特征研究

Study on Hot Deformation Characteristics of Molybdenum Based on Processing Map

摘要:

通过热压缩试验研究钼金属在应变速率为0.01~10 s-1，变形温度为900~1450 ℃条件下的热变形性能，建立了基于流变应力的钼金属热变形的本构方程。综合考虑应变速率和变形温度对材料微观结构及性能的影响，根据动态材料模型（DMM）建立了钼金属的热加工图，并利用加工图确定了热变形时的流变失稳区，分析了不同区域钼金属的高温变形特征。

Abstract:

Hot deformation characteristics of molybdenum was investigated by hot compression tests carried out in the temperature range of 900-1450 °C and strain rate range of 0.01-10 s-1. A constitutive equation of hot deformation of molybdenum based on the flow stress was established. With consideration of the effects of the deformation temperatures and the stain rates on microstructures and properties of molybdenum, processing maps were established based on the dynamic material model (DMM). And the instability zones of flow behavior could also be recognized by the maps. The hot deformation characteristics of molybdenum in different zones were also analyzed.