45Cr4NiMoV合金动态再结晶临界应变  

Critical strain of dynamic recrystallization of 45Cr4NiMoV steel

作　　者：陈学文[1,2] 陈天安[1] 周会军[1] 朱美玲[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]华中科技大学模具技术国家重点实验室,湖北武汉430074

出　　处：《材料热处理学报》2015年第1期109-113,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51072240);国家教育部留学回国人员科研启动基金(2012940)

摘　　要：采用Gleeble热模拟试验机对45Cr4Ni Mo V合金在变形温度为1000~1150℃,应变速率为0.002~5 s-1,最大变形量为55%的条件下进行热模拟压缩试验。通过对采集到的数据进行处理,结合lnθ-ε曲线的拐点及-(lnθ)/ε-ε曲线的极小值判据,建立了45Cr4Ni Mo V动态再结晶临界应变模型。结果表明,45Cr4Ni Mo V合金动态再结晶临界应变随变形温度递增以及应变速率递减而增加,临界应变εc与峰值应变εp之间满足:εc=0.42761εp,动态再结晶临界应变模型为:εc=0.000522Z0.15142。The 45Cr4 Ni Mo V steel thermal compression experiment was carried out at 1000-1150 ℃ and strain rate of 0. 002-5 s- 1on a Gleeble-1500 D thermo-simulation machine,the maximum deformation degree was 55%. Based on the experiment data,critical strain of dynamic recrystallization for 45Cr4 Ni Mo V steel was constructed using the criterions of the knee of the minimum of lnθ- ε curve and- ( lnθ) / ε- ε curve. The results show that the dynamic recrystallization critical strain increases with the increasing deformation temperature and the decreasing the strain rate. The relationship between the dynamic recrystallization critical strain εcand the peak strainεpis: εc= 0. 42761εp. Dynamic recrystallization critical strain model is: εc= 0. 000522Z0. 15142.

关 键 词：45Cr4NiMoV合金 加工硬化率 动态再结晶 临界应变 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG142.1[金属学及工艺—金属学]