变形量对车用冷锻变形Ti-9Al钛合金组织和拉伸性能的影响
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摘要
对Ti-9Al钛合金试样进行冷锻变形处理,利用EBSD、TEM以及力学拉伸等实验手段,分析变形量对其微观组织结构与力学性能造成的影响。研究结果表明:经固溶处理后,棒材中形成了许多大尺寸等轴晶显微组织,未产生变形或剪切带。当变形量为20%时,LAGBs在合金基体中的比例达到了固溶态比例的3倍左右,而当冷锻变形量上升后,LAGBs比例增加速率也变得更慢;当变形量达到60%时,LAGBs的比例从最初的14%上升为18%。经变形处理后,Ti-9Al钛合金中的α相在冷锻变形前后从最初的29. 2%发生明显的降低,随着冷锻变形量的增加,表现出单调减小的变化规律。随着冷锻变形量的逐渐增大,合金保持一定的塑性,达到60%的冷锻变形量时,依然可以保持6. 8%的室温伸长率。
The cold forging deformation treatment to Ti-9 Al titanium alloy sample was conducted,and the influences of deformation amount on microstructure and mechanical properties were analyzed by EBSD,TEM and mechanical tensile methods. The results show that many large size isometric crystal microstructures are formed in the bar after solid solution treatment without deformation or shear bands.When the deformation amount is 20%,the proportion of LAGBs in the alloy matrix reaches about three times of the proportion of solid solution state,and the increasing rate of LAGBs proportion becomes slower when the cold forging deformation amount increases,and when the deformation amount reaches 60%,the proportion of LAGBs increases from the original 14% to 18%. After deformation treatment,theα phase in Ti-9 Al titanium alloy decreases significantly from the original 29. 2% before and after cold forging deformation. With the increasing of cold forging deformation amount,it shows the change law of monotonically decreasing. Furthermore,with the gradual increasing of cold forging deformation amount,the alloy maintains a certain plasticity,and the elongation at room temperature can still remain6. 8% when the cold forging deformation amount reaches 60%.
The cold forging deformation treatment to Ti-9 Al titanium alloy sample was conducted,and the influences of deformation amount on microstructure and mechanical properties were analyzed by EBSD,TEM and mechanical tensile methods. The results show that many large size isometric crystal microstructures are formed in the bar after solid solution treatment without deformation or shear bands.When the deformation amount is 20%,the proportion of LAGBs in the alloy matrix reaches about three times of the proportion of solid solution state,and the increasing rate of LAGBs proportion becomes slower when the cold forging deformation amount increases,and when the deformation amount reaches 60%,the proportion of LAGBs increases from the original 14% to 18%. After deformation treatment,theα phase in Ti-9 Al titanium alloy decreases significantly from the original 29. 2% before and after cold forging deformation. With the increasing of cold forging deformation amount,it shows the change law of monotonically decreasing. Furthermore,with the gradual increasing of cold forging deformation amount,the alloy maintains a certain plasticity,and the elongation at room temperature can still remain6. 8% when the cold forging deformation amount reaches 60%.
引文
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[3]郑念庆,张永强,和永岗,等.显微组织对TA11钛合金棒材力学性能的影响[J].锻压技术,2017,42(8):146-151.Zheng N Q,Zhang Y Q,He Y G,et al.Influence of microstructure on mechanical properties of titanium alloy TA11 bar[J].Forging&Stamping Technology,2017,42(8):146-151.
[4]程好,冯爱新,黄宇,等.TC4钛合金薄板激光填丝焊接头成形与组织研究[J].热加工工艺,2018,47(19):94-96.Cheng H,Feng A X,Huang Y,et al.Joint formation and microstructure of laser filler wire welding[J].Hot Working Technology,2014,47(19):94-96.
[5]苏娟华,孙浩,任凤章,等.XRD的TA10钛合金热压缩变形后位错演化分析[J].哈尔滨工程大学学报,2019,40(2):1-8.Su J H,Sun H,Ren F Z,et al.Dislocation evolution analysis of hot compressive deformed TA10 titanium alloy based on the XRD[J].Journal of Harbin Engineering University,2019,40(2):1-8.
[6]周盛武,董洪波,姜智勇,等.TB17钛合金热压缩流变应力分析及本构方程[J].塑性工程学报,2018,25(1):218-223.Zhou S W,Dong H B,Jiang Z Y,et al.Flow stress analysis and constitutive equation of TB17 titanium alloy during hot compression[J].Journal of Plastic Engineering,2008,25(1):218-223.
[7]杜舜尧,陈明和,朱知寿,等.新型超高强钛合金TB17铣削加工表面完整性试验研究[J].组合机床与自动化加工技术,2017,28(4):125-129.Du S Y,Chen M H,Zhu Z S,et al.Experimental research on surface integrity of milling new ultra-high strength titanium alloy TB17[J].Modular Machine Tool&Automatic Manufacturing Technique,2017,28(4):125-129.
[8]Naofumi I,Tatsuro M,Kazuhiro T S,et al.Influence of cold rolling on fundamental properties of Ti-15V-3Cr-3Sn-3Al alloy[J].Mater.Trans.,2015,56(11):1-7.
[9]费跃,王新南,商国强,等.冷却速度对TB17合金组织及硬度的影响[J].稀有金属,2017,41(9):1056-1060.Fei Y,Wang X N,Shang G Q,et al.Microstructure evolution and hardness of TB17 alloy at different cooling rates[J].Chinese Journal of Rare Metals,2017,41(9):1056-1060.
[10]王哲,王新南,祝力伟,等.TB17钛合金β相区晶粒长大行为[J].钛工业进展,2016,33(6):11-15.Wang Z,Wang X N,Zhu L W,et al.Grain growth behavior inβsingle phase of TB17 titanium alloy[J].Titanium Industry Progress,2016,33(6):11-15.
[11]王哲,王新南,祝力伟,等.TB17钛合金等温时效析出行为[J].航空材料学报,2016,36(5):1-6.Wang Z,Wang X N,Zhu L W,et al.Isothermal aging precipitate of TB17 titanium alloy[J].Journal of Aeronautical Materials,2016,36(5):1-6.
[12]郑帮智,唐新新,田晓琳,等.计算机应用钛合金线材旋锻数值仿真中夹具与锤头相对运动的处理方法[J].锻压技术,2017,42(10):195-202.Zheng B Z,Tang X X,Tian X L,et al.Treatment methods on relative motion between clamp and hammer in numerical simulation of rotary forging for titanium alloy wire[J].Forging&Stamping Technology,2017,42(10):195-202.