β转变组织TA15钛合金塑性流动失稳行为
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摘要
采用THERMECMASTOR-Z型热模拟实验机对魏氏和网篮2种β转变组织TA15钛合金在温度750~950℃、应变速率0.001~10s~(-1)范围进行等温恒应变速率压缩实验。结果表明,2种β转变组织钛合金在低温(750~880℃)和高应变速率(0.0032~10s~(-1))范围存在较大区域的塑性流动失稳,且魏氏组织发生塑性流动失稳的范围更大。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,网篮组织的塑性流动失稳缺陷主要有45°宏观剪切裂纹和局部流动带。魏氏组织比网篮组织更容易发生塑性流动失稳与其α层片粗大导致变形协调性差有关。
An isothermal constant strain rate compression test was performed on TA15 titanium alloy with two types ofβtransformed microstructures of basket-weave and Widmannstatten in the temperature range of 750~950℃ and the strain rate range of 0.001~10s~(-1).The results show that there is a wide range of plastic flow instability in the twoβtransformed microstructures in low temperature and high strain rate regions(750~880℃,0.0032~10s~(-1)).The instability range of Widmannstatten microstructure is larger than that of the basket-weave microstructure.The instability defects of Widmannstatten microstructure mainly include 45°macro shear crack,microcrack and flow localization band,while the defects of basket-weave microstructure are chiefly 45° macro shear crack and flow localization band.The plastic flow instability is more likely to occur in Widmannstatten microstructure than in the basket-weave one,which is primarily due to the poor deformation coordination caused by the coarse lamellarαin Widmannstatten microstructure.
An isothermal constant strain rate compression test was performed on TA15 titanium alloy with two types ofβtransformed microstructures of basket-weave and Widmannstatten in the temperature range of 750~950℃ and the strain rate range of 0.001~10s~(-1).The results show that there is a wide range of plastic flow instability in the twoβtransformed microstructures in low temperature and high strain rate regions(750~880℃,0.0032~10s~(-1)).The instability range of Widmannstatten microstructure is larger than that of the basket-weave microstructure.The instability defects of Widmannstatten microstructure mainly include 45°macro shear crack,microcrack and flow localization band,while the defects of basket-weave microstructure are chiefly 45° macro shear crack and flow localization band.The plastic flow instability is more likely to occur in Widmannstatten microstructure than in the basket-weave one,which is primarily due to the poor deformation coordination caused by the coarse lamellarαin Widmannstatten microstructure.
引文
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[3]Jin Hexi(金和喜),Wei Kexiang(魏克湘),Li Jianming(李建明)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2015,25(2):280
[4]Yin W H,Xu F,Ertorer O et al.Acta Materialia[J],2013,61(10):3781
[5]Fu Yingqian(付应乾),Dong Xinlong(董新龙).Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2016,45(1):102
[6]Deng X G,Hui S X,Ye W J et al.Materials Science and Engineering A[J],2014,598:304
[7]Lu Shiqiang(鲁世强),Li Xin(李鑫),Wang Kelu(王克鲁)et al.Chinese Journal of Mechanical Engineering(机械工程学报)[J],2007,43(8):77
[8]Prasad Y V R K,Seshacharyulu T.Materials Science and Engineering A[J],1998,243:82
[9]Robi P S,Dixit U S.Journal of Materials Processing Technology[J],2003,142:289
[10]Ma X,Zeng W D,Tian F et al.Materials Science and Engineering A[J],2012,545:132
[11]Quan G Z,Lv W Q,Liang J T et al.Journal of Materials Processing Technology[J],2015,221:66
[12]Li J B,Liu Y,Liu B et al.Intermetallics[J],2014,52:49
[13]Seshacharyulu T,Medeiros S C,Frazier W G et al.Materials Science and Engineering A[J],2000,284:184
[14]Fang Gang(方刚),Zou Jianrong(邹建荣),Lu Yafeng(卢亚锋)et al.Journal of Tsinghua University,Science and Technology(清华大学学报,自然科学版)[J],2012,52(7):929
[15]Wu Xiaoping(邬小萍),Li Defu(李德富),Guo Shengli(郭胜利)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2012,22(1):80
[16]Seshacharyulu T,Medeiros S C,Frazier W G et al.Materials Science and Engineering A[J],2002,325:112
[17]Dong Xianjuan(董显娟).Thesis for Doctorate(博士论文)[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2011:93
[18]Sun Kun(孙坤),Cheng Xingwang(程兴旺),Wang Fuchi(王富耻)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2008,37(10):1856
[19]Song H,Wu G Q,Zhang Z G et al.Materials Letters[J],2006,60:3385
[20]Semiatin S L,Lahoti G D.Metallurgical Transactions A[J],1981,12(10):1705
[21]Weiss I,Froes F H,Eylon D et al.Metallurgical Transactions A[J],1986,17(11):1935