再结晶组织对TA2纯钛绝热剪切行为的影响

胡力 刘龙飞 王旭 杨智程 吴志强

胡力, 刘龙飞, 王旭, 杨智程, 吴志强. 再结晶组织对TA2纯钛绝热剪切行为的影响[J]. 爆炸与冲击, 2023, 43(1): 013104. doi: 10.11883/bzycj-2021-0529
引用本文: 胡力, 刘龙飞, 王旭, 杨智程, 吴志强. 再结晶组织对TA2纯钛绝热剪切行为的影响[J]. 爆炸与冲击, 2023, 43(1): 013104. doi: 10.11883/bzycj-2021-0529
HU Li, LIU Longfei, WANG Xu, YANG Zhicheng, WU Zhiqiang. Effects of recrystallized structures on adiabatic shear behaviors of TA2 pure titanium[J]. Explosion And Shock Waves, 2023, 43(1): 013104. doi: 10.11883/bzycj-2021-0529
Citation: HU Li, LIU Longfei, WANG Xu, YANG Zhicheng, WU Zhiqiang. Effects of recrystallized structures on adiabatic shear behaviors of TA2 pure titanium[J]. Explosion And Shock Waves, 2023, 43(1): 013104. doi: 10.11883/bzycj-2021-0529

再结晶组织对TA2纯钛绝热剪切行为的影响

doi: 10.11883/bzycj-2021-0529
基金项目: 国家自然科学基金(11772127, 51704112)
详细信息
    作者简介:

    胡 力(1996- ),男,硕士研究生,614320913@qq.com

    通讯作者:

    刘龙飞(1975- ),男,博士,教授,lfliu1@hnust.cn

  • 中图分类号: O347.3

Effects of recrystallized structures on adiabatic shear behaviors of TA2 pure titanium

  • 摘要: 使用二辊轧机对TA2工业纯钛进行多道次大应变冷轧处理,制备了冷轧总变形量为70%的TA2纯钛板。通过对冷轧TA2纯钛板进行500 ℃加热、不同保温时间的退火处理,获得了具有不同再结晶组织的钛板。基于帽形试样和限位环变形控制技术,在分离式霍普金森压杆装置上对不同再结晶组织的试样进行动态冲击冻结实验,结合光学显微镜和扫描电子显微镜表征试样冲击前后微观组织的变化,研究了再结晶组织对TA2纯钛绝热剪切行为的影响。结果表明,随着退火保温时间的延长,试样再结晶晶粒占比逐渐增大,晶粒分布由分散向局部聚集转变;在相同应变和应变率下,在所有试样中都观察到了绝热剪切带,再结晶晶粒占比高的试样更易诱发绝热剪切带中裂纹形核扩展。对比变形前后试样再结晶组织和几何必需位错变化,结合剪切区整体温升分析发现,再结晶晶粒作为材料软化点能够诱发剪切带的形成,而剪切带发展后期产生的绝热温升会促进剪切带内材料发生二次再结晶,提高剪切带内材料的韧性,延缓剪切裂纹的形成。
  • 图  1  实验装置和试样示意图

    Figure  1.  Schematics of the experimental device and its specimen

    图  2  不同退火保温时间试样的显微组织

    Figure  2.  Microstructures of specimens with different annealing time

    图  3  不同退火保温时间试样的EBSD形貌

    Figure  3.  EBSD morphologies of specimens with different annealing time

    图  4  不同退火保温时间试样晶粒尺寸和再结晶比例统计

    Figure  4.  Grain size and recrystallization ratio statistics of specimens with different annealing time

    图  5  不同退火保温时间试样的剪切应力-应变曲线

    Figure  5.  Shear stress-strain curves of specimenswith different annealing time

    图  6  不同退火保温时间试样剪切区塑性功引起的温升

    Figure  6.  Temperature rise due to plastic dissipation work in shear area of specimens with different annealing time

    图  7  不同退火保温时间试样剪切变形后剪切区域的微观形貌

    Figure  7.  Microstructures of the shear area after shear deformation for specimens with different annealing time

    图  8  不同退火保温时间试样剪切变形后剪切区的EBSD形貌

    Figure  8.  EBSD morphologies of shear area after shear deformation for specimens with different annealing time

    图  9  不同退火保温时间试样剪切变形前剪切区域的平均取向角差及分布

    Figure  9.  Kernel average misorientations and distributions of shear area before shear deformation for specimens with different annealing time

    图  10  不同退火保温时间试样剪切变形后剪切区域的平均取向角差及分布

    Figure  10.  Kernel average misorientations and distributions of shear area after shear deformation for specimens with different annealing time

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出版历程
  • 收稿日期:  2021-12-27
  • 修回日期:  2022-05-15
  • 网络出版日期:  2022-06-06
  • 刊出日期:  2023-01-05

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