航空航天紧固件用TC16钛合金在冷压缩过程中的组织演变  

Microstructure Evolution of TC16 Titanium Alloy for Producing Aerospace Fasteners During Cold Compression

作　　者：杨万博 霍元明 何涛 薛勇[2] 胡玉佳 沈梦蓝 Yang Wanbo;Huo Yuanming;He Tao;Xue Yong;Hu Yujia;Shen Menglan(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;School of Material Science and Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620 [2]中北大学材料科学与工程学院,山西太原030051

出　　处：《稀有金属材料与工程》2022年第2期386-391,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China (51805314)。

摘　　要：为了解钛合金在冷压缩过程中的变形机理和微观组织演变,使用Gleeble 3800热模拟试验机进行冷压缩试验。在冷压缩试验中,通过不同应变(0.2、0.4、0.6、0.8和1.0)和不同应变率(0.1、1.0和10.0 s^(-1)),来研究应变和应变率对钛合金冷变形中微观组织演变的影响。结果表明,较大的真应变和较高的应变率容易使材料内部产生局部晶粒粗化和绝热剪切带。真应变应选择在0.2~0.6的范围内。1.0 s^(-1)的应变速率下,组织均匀且晶粒细小,适合冷变形。在冷变形过程中观察到的变形软化主要是由在较大的真应变和应变速率下产生的绝热温升和局部晶粒粗化引起的。To understand the deformation mechanism and microstructure evolution of TC16 titanium alloy during cold heading, cold compression tests were conducted using a Gleeble 3800 thermo-mechanical simulator. The effects of strains(0.2, 0.4, 0.6, 0.8 and 1.0)and strain rates(0.1, 1.0 and 10.0 s^(-1)) on the deformation behavior and microstructure evolution of the alloys were investigated.Results show that larger true strain and higher strain rate are prone to cause local grain coarsening and adiabatic shear bands within the material. True strain should be selected in the range from 0.2 to 0.6. Uniform structure and fine grains that are suitable for cold forming can be achieved at a strain rate of 1.0 s^(-1). The deformation softening observed during cold deformation is caused mainly by adiabatic temperature rise and local grain coarsening at larger true strains and higher strain rates.

关 键 词：TC16钛合金 微观组织演变 冷压缩变形 

分 类 号：TG146.23[一般工业技术—材料科学与工程] V252.2[金属学及工艺—金属材料]