挤压成形TC4-ELI厚壁管材组织与力学性能研究  

Microstructure and Mechanical Properties of TC4-ELI Thick-walled Extruded Pipe

作　　者：向柳 辛社伟[2] 毛小南 杜宇[2] 屈磊 李婷 应扬[2] Xiang Liu;Xin Shewei;Mao Xiaonan;Du Yu;Qu Lei;Li Ting;Ying Yang(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2021年第6期2112-2117,共6页Rare Metal Materials and Engineering

基　　金：军委装备发展部预先研究项目(41422060206)。

摘　　要：运用有限元数值模拟与实际挤压进行TC4-ELI厚壁管材成形研究,探究厚壁管材不同区域显微组织和力学性能的差异,以及形成差异的原因。结果表明:在挤压成形过程中,管材外部的温度和等效应力较高,有较多的α晶粒沿ED方向被拉长,且长条状α晶粒的长大程度更高,生成相对强度较高的基面织构。而管材内部所受应力较低,晶粒择优取向行为不明显,只生成微弱的{1210}<2021>板织构。力学性能受到晶粒大小和晶体学取向的综合作用,管材外部虽然晶粒粗大,但生成的基面织构与轴向拉伸应力的Schmid因子较小,使得管材外部的强度高于内部。The forming of TC4-ELI thick-walled pipe was studied by finite element numerical simulation and actual extrusion. The differences and the reasons for the differences were explored in microstructure and mechanical properties of different areas in thick-walled pipes. The results show that the external temperature and equivalent stress of the pipe are relatively high during the extrusion process.More α grains are elongated along the ED direction, and the elongated α grains grow to a higher degree. Base texture with relatively high strength is generated. However, the internal stress of the pipe is relatively low. The preferred orientation of the grains is not obvious, and only weak ■plate texture is generated. Mechanical properties are affected by the combined effect of grain size and crystallographic orientation. Although the exterior of the pipe has coarse grains, the Schmid factor between the axial tensile stress and base texture is small, which causes that the exterior of the pipe has higher strength.

关 键 词：TC4-ELI钛合金 数值模拟 显微组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]