摘要
在Gleeble-1500D热/力模拟试验机上进行高温等温单道次压缩试验,探讨Cu-0.8Cr-0.3Zr-0.03P合金在变形温度和应变速率分别为650-950℃和0.001-10 s^-1条件下的热变形特性。通过真应力-真应变曲线的采集数据计算出合金高温热压缩时的本构方程和热变形激活能Q,根据动态模型绘制真应变为0.3和0.5的热加工图,并结合显微组织分析合金的变形机理,确定热加工失稳区间。研究表明：功率耗散因子η随变形温度递升呈增大趋势,合金的流变软化机理由动态回复逐渐向动态再结晶转变。得出热压缩过程的的最优加工范围为：温度为730-875℃,应变速率为0.1-1 s^-1。
The hot deformation behaviors of Cu-0. 8Cr-0. 3Zr-0. 03 P alloy were investigated at 650-950 ℃ and strain rate range of 0. 001-10s^-1through hot compression tests on a Gleeble-1500 D thermal simulater. The constitutive equations and hot deformation activation energy Q were obtained according to the test data of true stress-strain curves. Based on dynamic materials model,the processing maps for the alloy obtained at strains of 0. 3 and 0. 5 were used to predict the region of deformation instability and deformation mechanism. The results show that the power dissipation factor η increases with the increasing of the temperature,the deformation mechanism transforms from dynamic recovery to dynamic recrystallization. The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the maps,in which the hot temperature is 730-875 ℃ and the strain rate is 0. 1-1 s^-1.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第3期230-234,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51101052)
河南省高等学校青年骨干教师资助计划(2012GGJS-073)
河南省教育厅自然科学研究计划(2011B430013)
河南科技大学青年科学基金(2011QN48)
