钛合金动态强度测试方法的改进及应用研究  

Improvement and Application Study of Dynamic Strength Testing Method for Titanium Alloy

作　　者：魏江雯 胡蕾 杨艳 吴辰龙 WEI Jiang-wen;HU Lei;YANG Yan;WU Chen-long(Shaanxi Yichuang Titanium Zirconia Testing Co.,Ltd,Xi’an 710075,China;State Nuclear Bao Ti Zirconium Industry Co.Ltd,Baoji 721000,China)

机构地区：[1]陕西亿创钛锆检测有限公司,陕西西安710075 [2]国核宝钛锆业股份公司,陕西宝鸡721000

出　　处：《世界有色金属》2024年第11期214-216,共3页World Nonferrous Metals

摘　　要：目前,对钛合金的动态强度检测尚无明确的标准,且对检测设备及操作过程的要求各不相同,这会造成同一种材料在不同的检测体系下,检测出差异很大的动态压缩力学结果,也可能造成同一种材料在同一体系下检测出差异很大的动态力学结果。本项目拟采用电子万用仪和分立霍普金森压杆对钛合金进行准静、动态加载,测定其应力-应变曲线,并结合微观结构变化,探讨其在高应变率条件下的动态加载特性。研究发现,在1100~6000s-1的应变速率下,钛合金表现出较强的速率敏感性,当应变速率增大时,速率增韧和增塑作用显著,而当应变速率大于4800s-1时,速率敏感性和增塑作用逐渐减弱。在2500s-1的应变速率下,样品呈现出与加载方向呈45°角的绝热剪切线,当应变速率增大时,会产生一条剪切带,但不会显著加宽,这是因为分散的β粒子相的滑移聚合体形成的阻挡带。Currently,there is no clear standard for dynamic strength testing of titanium alloys,and the requirements for testing equipment and operation processes vary.This may result in significant differences in dynamic compression mechanical results for the same material under different testing systems,or in significant differences in dynamic mechanical results for the same material under the same system.This project plans to use an electronic multimeter and discrete Hopkinson compression rods to perform quasi-static and dynamic loading on titanium alloys,measure their stress-strain curves,and explore their dynamic loading characteristics under high strain rate conditions in combination with microstructure changes.Research has found that titanium alloys exhibit strong rate sensitivity at strain rates ranging from 1100 to 6000 s-1.As the strain rate increases,the rate toughening and plasticizing effects are significant.However,when the strain rate exceeds 4800 s-1,the rate sensitivity and plasticizing effects gradually weaken.At a strain rate of 2500 s-1,the sample exhibits an adiabatic shear line at a 45°angle to the loading direction.As the strain rate increases,a shear band is generated,but not significantly widened,due to the barrier band formed by the dispersedβparticle phase slip polymer.

关 键 词：钛合金 动态性能 HOPKINSON杆 

分 类 号：TG146.23[一般工业技术—材料科学与工程]