Ti-B25钛合金管材挤压成形数值模拟及实验研究

Numerical Simulation and Experimental Study of Extrusion Forming of Ti-B25 Titanium Alloy Pipe

为了加快推动Ti-B25钛合金在舰船通信系统上的应用,利用前期构造的本构方程和热加工图优化出的工艺参数,使用DEFORM-3D有限元软件模拟了变形温度900℃、应变速率0.1 s^(-1)工艺参数下的管材挤压过程,并对模拟过程进行了实际挤压验证。结果表明:在变形温度900℃、应变速率0.1 s^(-1)条件下能成功挤压出∅62 mm×12 mm的Ti-B25钛合金管坯,并且管坯具有良好的表面质量,组织中存在再结晶晶粒。管坯经过830℃/1 h+600℃/8 h固溶时效处理后具有良好的强-塑性匹配,满足舰船天线管使用要求。

In order to accelerate the application of Ti-B25 titanium alloy in ship communication system,DEFORM-3D finite element software was used to simulate the pipe extrusion process under the deformation temperature of 900℃and the strain rate of 0.1 s-1 with the constructed constitutive equation and the optimized process parameters in the previous work.And the pipe extrusion experiment of Ti-B25 alloy was performed to validate the results of FE simulation.The results show that the pipe blank of∅62 mm×12 mm can be successfully extruded under the deformation temperature of 900℃and the strain rate of 0.1 s^(-1).The pipe blank has good surface quality and recrystallized microstructure.After solution aging treatment at 830℃/1 h+600℃/8 h,the pipe blank exhibits good stress-plastic matching,which meets the requirement of the pipes used in the shipboard antenna.