基于Murty判据的TB8钛合金加工图及变形区分析  

Processing map and deformation zone analyses of TB8 titanium alloy based on Murty criterion

作　　者：袁大庆[1] 董洪波[1] 邹忠波[1] 徐远刚[1] 

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《材料热处理学报》2016年第11期73-78,共6页Transactions of Materials and Heat Treatment

基　　金：航空科学基金项目(2015ZE56011);江西省科学计划项目(20151BBE50042)

摘　　要：采用Gleeble3500对TB8钛合金进行等温恒应变速率热模拟压缩试验,研究该合金在温度750～900℃、应变速率0.001～10 s^-1热变形参数范围内基于Murty判据的加工图,并分析TB8钛合金的热变形行为。结果表明：TB8钛合金的失稳变形区为：温度750～780℃,应变速率0.03～10 s^-1;温度780～900℃,0.35～10 s^-1,发生失稳变形后的组织特征为局部流动及β相晶粒的不均匀变形。较佳的稳定变形区为：温度815～885℃、应变速率0.03～0.1 s^-1,发生稳定变形后的组织为动态再结晶后的等轴组织。结合预测的稳定变形区及显微组织特征可知,在单相区850℃变形时,0.1 s^-1作为动态回复及动态再结晶的临界应变速率。Isothermal constant strain rate compression tests of TB8 titanium alloy were carried out on a Gleeble3500 thermal mechanical simulator,processing map and heat deformation behavior of the alloy based on Murty criterion were researched in the temperature range of750-900 ℃ and strain rate of 0. 001-10 s^-1. The results show that the buckling deformation zone of the TB8 titanium alloy is as follows：the temperature is 750-780 ℃ and the strain rate is 0. 03-10 s^-1,and the temperature is 780-900 ℃ and the strain rate is 0. 35-10 s^-1.The microstructure characteristics of the buckling deformation zone are flow localization and inhomogeneous deformation of β grain. The preferable ranges of stability region are in the temperature of 815-885 ℃ and strain rate of 0. 03-0. 1 s^-1,the microstructure of the stability region is equiaxed structure after dynamic recrystallization. Combining with the predicted stability deformation region and microstructure characteristics,showing that the strain rate of 0. 1 s^-1is the critical strain rate of dynamic recovery and dynamic recrystallization,when the heat deformation temperature is 850 ℃ in a single phase.

关 键 词：TB8钛合金 Murty判据 加工图 变形区 

分 类 号：TG146.2[一般工业技术—材料科学与工程]