TC4钛合金仿莲房特征芯体热蠕变成形工艺研究  

High Temperature Creep Forming Process of TC4 Titanium Lotus Seedpod-like Core

作　　者：王文森 李晓红 邓云华 岳喜山 Wang Wensen;Li Xiaohong;Deng Yunhua;Yue Xishan(Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]中国航空制造技术研究院航空焊接与连接技术航空科技重点实验室,北京100024

出　　处：《稀有金属材料与工程》2020年第9期3244-3250,共7页Rare Metal Materials and Engineering

基　　金：航空科学基金(2017ZE25006)。

摘　　要：提出了一种新的夹层芯体——仿莲房特征芯体结构。以TC4钛合金为对象,采用真空热蠕变成形方法探索了仿莲房特征芯体制备的可行性,并分析了主要工艺参数对仿莲房特征芯体成形高度、显微组织和力学性能的影响。结果表明:采用真空热蠕变成形方法制备仿莲房特征芯体可行,真空热蠕变成形过程中TC4钛合金材料通过发生位错运动和晶界滑移实现芯体孔柱的热成形。真空热蠕变变形后,显微组织由原始细小等轴组织完全转变为再结晶等轴组织。随成形压力和保温时间的增加,芯体高度、平压强度和比平压强度逐渐增加。A new sandwich core called lotus seedpod-like core was proposed in this paper.High temperature creep forming experiment was conducted on TC4 titanium plate to prove the feasibility of lotus seedpod-like core.Moreover,effects of major forming parameters on the height,microstructure,mechanical properties of the lotus seedpod-like core were studied.The results show that it is feasible to prepare lotus seedpod-like core by high temperature creep forming.During creep forming,TC4 titanium sheet transforms to lotus seedpod-like core by dislocation motion and grain boundary sliding.After high temperature creep,the fine equiaxed structure completely transforms into the recrystallized equiaxed structure.The height,compressive strength and specific compressive strength of core are increased with the increase of forming pressure and holding time.

关 键 词：仿莲房特征芯体 真空热蠕变成形 芯体高度 显微组织 力学性能 

分 类 号：TG306[金属学及工艺—金属压力加工]