摘要
在实际热挤压实验基础上,结合IN690合金热变形本构关系,建立了该合金管热挤压过程的二维轴对称有限元模型。该模型变形区形状与实际稳态挤压阶段相一致,计算获得稳定挤压力模拟结果与实验吻合较好。分析了锥形、平锥形、双锥形及碗形4种变形区形状参数对热挤压过程的影响,结果表明:锥形变形区最小有利于降低挤压力;碗形和平锥形变形区最高温变化平稳有利于温度的控制,碗形变形区的局部温升最小有利于组织控制及产品质量的提高;综合挤压力、温度均匀性、表面质量三方面因素,尽量选择碗形变形区和双锥形变形区进行挤压。
Combined with the actual hot extrusion test and peak stress constitutive relation,a two-dimensional axisymmetric finite element model was built for the IN690 superalloy tube during hot extrusion process.The deformation zone of the model was accordance with the deformation zone parameters of actual steady-state extrusion.The simulated steady extrusion force was in good agreement with the experimental results.The different deformation zone parameters were investigated.The results show that there is a minimum extrusion force for the cone deformation zone.The relatively stable maximum temperature is obtained by flat-conical deformation zone and bowl deformation zone.The local temperature rise of bowl deformation zone is the smallest.In order to reduce extrusion force and rise temperature,as well as improve surface quality,the bowl deformation zone and double-cone deformation area is recommended.
出处
《锻压技术》
CAS
CSCD
北大核心
2011年第5期166-169,共4页
Forging & Stamping Technology
基金
国家自然科学基金钢铁联合基金重点项目(No.50831008)
