摘要
采用Deform-2D有限元软件模拟H65黄铜ECAP变形实验,分析H65黄铜ECAP变形规律及第二相取向的演变,并结合H65黄铜ECAP变形实验验证H65黄铜ECAP变形过程中第二相取向的演变.结果表明:ECAP变形过程可分为开始变形载荷逐渐增加,逐渐变形载荷增加迅速,变形稳定载荷一定范围内波动,退出变形载荷减小迅速4个阶段;试样中心的等效应变分布随挤压道次的增加而逐渐趋于稳定,并集中在试样的3~9 mm区域内;偶数道次挤压,可以获得等效应变较均匀的变形件;模具内角转角处是裂纹优先产生的地方.第二相取向的演变模拟与实验基本一致,即试样中心水平第二相,经奇数道次挤压后,大约与水平正方向呈约30°规则的分布在基体中;经偶数道次挤压后,心部和边部的取向各不相同.试样中心竖直第二相,各道次挤压后,取向基本保持不变.
The equal angular pressing（ECAP） of H65 brass was simulated by using the deform-2D software by analyzing the deformation regularity and the secondary phase orientation in the ECAP process.The combined ECAP deformation experiment verified the evolution of the secondary phase orientation.The results show that,ECAP deformation process can be divided into four states：initial deformation load is gradually increased,gradual deformation load is rapidly increased, stable deformation load is fluctuated within a certain range,finished deformation load is quickly decreased; the center equivalent strain distribution of the sample along with the increasement of extrusion passes is gradually stabilized, and concentrated within 3 to 9 mm in the center of samples.Even passes can be obtained relatively homogeneous deformation; the die that in corner of inner angle is the prior place to crack.The simulation of the second phase evolution almost the same with experiment, the second phase of the central sample after odd passes deformed, the angle between deformed second phase and extrusion direction is between 30 degrees during odd passes, center and edge orientation is different during even passes.The vertical second phase in the center sample, orientation remains the same during different passes.
出处
《有色金属科学与工程》
CAS
2017年第1期105-111,共7页
Nonferrous Metals Science and Engineering
基金
2015年江西省研究生创新专项资金项目(YC2015-S281)
