CAJ | 학술논문

采用 Gleeble-3500热模拟机,在变形温度为950~1150℃、应变速率为0.001~10 s-1的条件下,研究了粗大柱状晶粒纯镍的热变形行为和加工图.结果表明：热压缩过程中流变应力随应变速率增大而增大,随变形温度降低而增大.流变应力与应变速率、变形温度之间的关系用 Zener-Hollomon 参数来描述,热变形激活能为312.4 kJ/mol.基于动态材料模型(DMM)热加工图及结合合金相显微组织分析,得到纯镍较优的热加工参数：变形温度为1060~1120℃,应变速率为0.03~0.20 s-1的蛋形区域.
채용 Gleeble-3500열모의궤,재변형온도위950~1150℃、응변속솔위0.001~10 s-1적조건하,연구료조대주상정립순얼적열변형행위화가공도.결과표명：열압축과정중류변응력수응변속솔증대이증대,수변형온도강저이증대.류변응력여응변속솔、변형온도지간적관계용 Zener-Hollomon 삼수래묘술,열변형격활능위312.4 kJ/mol.기우동태재료모형(DMM)열가공도급결합합금상현미조직분석,득도순얼교우적열가공삼수：변형온도위1060~1120℃,응변속솔위0.03~0.20 s-1적단형구역.
The hot deformation behavior of pure nickel with coarse,columnar grains at the tempera-ture range of 950~1 150 ℃and the strain rate range of 0.001 ~10 -1 was investigated in the Gleeble-3500 system.The results showed that flow stress increased with the increase of strain rate and decreased with the increase of temperature.The relationship between flow stress and strain rate and temperature was re-presented by the Zener-Hollomon parameter and the apparent activation energy of 312.4 kJ/mol.The opti-mum processing parameters were obtained by using processing maps based on the dynamic material model and microstructural observation at the deformation temperature of 1 060 ~ 1 120 ℃and the strain rate of 0.03~0.2 s-1 .