董显娟,鲁世强,王克鲁,欧阳德来.β转变组织TA15钛合金塑性流动失稳行为研究[J].稀有金属材料与工程,2018,47(5):1485~1491.[Dong Xianjuan,Lu Shiqiang,Wang Kelu,Ouyang Delai.Study of the Plascticity Flow Instability Behavior of TA15 Tiatanium Alloy with Beta Transformed Microstructure[J].Rare Metal Materials and Engineering,2018,47(5):1485~1491.]
β转变组织TA15钛合金塑性流动失稳行为研究
投稿时间:2016-04-28  修订日期:2016-07-25
中文关键词:  β转变组织  流动失稳  局部流动带  原始β晶粒边界  等轴化
基金项目:国家自然科学基金资助(项目号51261020);航空科学基金资助(项目号2014ZE56015);江西省教育厅科学技术项目资助(项目号GJJ150734)
中文摘要:
      本文采用THERMECMASTOR-Z型热模拟实验机对魏氏和网篮两种β转变组织TA15钛合金在温度750℃-950℃、应变 速率0.001s-1-10s-1范围进行等温恒应变速率压缩实验。实验结果表明,两种β转变组织钛合金在低温(750℃-880℃)和高应 变速率(0.0032s-1-10s-1)范围存在较大区域的塑性流动失稳,且魏氏组织的塑性流动失稳范围更大,在温度750℃-775℃、应变 速率0.001s-1-0.0032s-1和温度880℃-950℃、应变速率0.56s-1-10s-1区域也出现了塑性流动失稳。魏氏组织的塑性流动失稳缺陷 主要有45°宏观剪切裂纹、微裂纹和局部流动带三种,网篮组织的失稳缺陷主要有45°宏观剪切裂纹和局部流动带两种。魏氏组织比网篮组织更容易发生塑性流动失稳与网篮组织组织更均匀,在变形过程中协调分散性好,不利于产生应力集中有关。
Study of the Plascticity Flow Instability Behavior of TA15 Tiatanium Alloy with Beta Transformed Microstructure
英文关键词:beta  transformed microstructure, flow  instability, flow  localization band, boundary  of prior  beta,spheroidizationS
英文摘要:
      Isothermal constant strain rate compression tests of TA15 titanium alloy with basket-weave and Widmannstatten two types of beta transformed microstructurehave been carried out in the temperature range of 750℃-950℃ and strain rate of 0.001s-1-10s-1. The results show that there is a wide range of plastic flow instabilitySof the two beta transformed microstructure at low temperature and high strain rate region (750℃-880℃,0.0032s-1-10s-1).The instability range of Widmannstatten microstructure is larger than that of basket-weave. In the range of 750℃-775℃,0.001s-1-0.0032s-1 and 880℃-950℃,0.56s-1-10s-1 the Widmannstatten microstructure also have plastic flow instability defects.The instability defects of Widmannstatten microstructure have 45° macro shear crack, flow localization band and microcrack. The basket-weave microstructure has 45° macro shear crack and flow localization defects. The plastic flow instability is more likely to happen in Widmannstatten than basket-weave microstructure is primary cause of the difference of the initial alpha lamellar thickness in two beta transformed microstructure.
作者单位E-mail
董显娟 南昌航空大学 dxj3@163.com 
鲁世强 南昌航空大学  
王克鲁 南昌航空大学  
欧阳德来 南昌航空大学  
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