TiB_(2)·TiAl_(3)/2024Al复合材料多向锻造数值模拟研究  

Numerical Simulation of Multi-directional Forging of TiB_(2)·TiAl_(3)/2024Al Composite

作　　者：张鸿名 李鑫[2] 李媛 齐蕾 李志勇 谢长海 郑洁 耿豪宇 陈刚[2] ZHANG Hong-ming;LI Xin;LI Yuan;QI Lei;LI Zhi-yong;XIE Chang-hai;ZHENG Jie;GENG Hao-yu;CHEN Gang(School of Ocean Engineering,Shandong Weihai 264209,China;School of Materials Science and Engineering,Harbin Institute of Technology(Weihai),Shandong Weihai 264209,China;Technology Development Department,Beijing Satellite Manufacturing Co.,Ltd.,Beijing 100094,China;Shandong North Binhai Machinery Co.,Ltd.,Shandong Zibo 255200,China)

机构地区：[1]哈尔滨工业大学(威海)海洋工程学院,山东威海264209 [2]哈尔滨工业大学(威海)材料科学与工程学院,山东威海264209 [3]北京卫星制造厂有限公司技术发展部,北京100094 [4]山东北方滨海机器有限公司,山东淄博255200

出　　处：《精密成形工程》2022年第4期46-54,共9页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51905122;51875121);山东省自然科学基金(ZR2019MEE039);山东省重点研发计划(2020CXGC010303)。

摘　　要：目的研究TiB_(2)·TiAl_(3)/2024Al复合材料多向锻造金属流动行为,以及锻造温度、锻造道次对复合材料再结晶行为及基体晶粒尺寸的影响。方法将TiB_(2)·TiAl_(3)/2024Al复合材料的本构模型及再结晶动力学模型导入Deform-3D有限元模拟软件中,建立复合材料多向锻造的数值仿真模型。通过数值仿真方法分析锻造温度和锻造道次对复合材料多向锻造组织的影响规律。结果多向锻造变形过程中,剧烈塑性变形和动态再结晶主要分布在材料试样内部的呈“X”形状的区域,单次下压最大等效应变为1.42。锻造1道次时,锻造温度从350℃升至500℃,再结晶体积分数从65.0%升至69.7%,平均晶粒尺寸由350℃的24.6μm降至500℃的21.5μm。在450℃锻造温度下,1道次锻造后,再结晶体积分数为69.2%,平均晶粒尺寸由铸态的45.0μm减小到21.9μm;2道次锻造后再结晶体积分数为89.5%,平均晶粒尺寸为16.3μm;3道次锻造后坯料的再结晶体积分数为96.1%,平均晶粒尺寸为14.3μm。与试验结果比较可知,模拟结果准确可靠。结论提高锻造温度和增大锻造道次可以促进试样发生动态再结晶,从而达到细化晶粒的目的。The work aims to study the behavior of multi-directional forging metal flow in TiB_(2)·TiAl_(3)/2024 Al composite and the effects of forging temperature and forging passes on the recrystallization behavior and matrix grain size of the composite.The constitutive model and recrystallization kinetic model of TiB_(2)·TiAl_(3)/2024 Al composite were imported into Deform-3D fi-nite element simulation software to establish the numerical simulation model of multi-directional forging of composite.The ef-fects of forging temperature and forging passes on the multi-directional forging structure of composite were analyzed by nu-merical simulation.In the process of multi-directional forging deformation,severe plastic deformation and dynamic recrystalli-zation were mainly distributed in the“X”-shaped region inside the specimen,and the maximum equivalent strain of single push down was 1.42.After one-pass forging,the forging temperature rose from 350℃to 500℃,and the recrystallization volume fraction increased from 65.0%to 69.7%.The average grain size decreased from 24.6μm at 350℃to 21.5μm at 500℃.At the forging temperature of 450℃,after one-pass forging,the recrystallization volume fraction was 69.2%,and the average grain size decreased from 45.0μm to 21.9μm;The volume fraction of recrystallization after two-pass forging was 89.5%,and the av-erage grain size was 16.3μm.After three-pass forging,the recrystallization volume fraction of the specimen was 96.1%,and the average grain size was 14.3μm.Compared with the experimental results,the simulation results were accurate and reliable.The dynamic recrystallization of specimen can be promoted by increase of forging temperature and forging passes,thus achieving grain refinement.

关 键 词：铝基复合材料 多向锻造 数值仿真 动态再结晶 晶粒细化 

分 类 号：TG314[金属学及工艺—金属压力加工]