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超细晶D6A钢动态拉伸力学特性实验研究

杨泽洲 申勇峰 冯晓伟 薛文颖 谢若泽 胡艳辉

杨泽洲, 申勇峰, 冯晓伟, 薛文颖, 谢若泽, 胡艳辉. 超细晶D6A钢动态拉伸力学特性实验研究[J]. 爆炸与冲击, 2022, 42(4): 043101. doi: 10.11883/bzycj-2021-0051
引用本文: 杨泽洲, 申勇峰, 冯晓伟, 薛文颖, 谢若泽, 胡艳辉. 超细晶D6A钢动态拉伸力学特性实验研究[J]. 爆炸与冲击, 2022, 42(4): 043101. doi: 10.11883/bzycj-2021-0051
YANG Zezhou, SHEN Yongfeng, FENG Xiaowei, XUE Wenying, XIE Ruoze, HU Yanhui. Investigation on dynamic tensile properties of an ultrafine grained D6A steel[J]. Explosion And Shock Waves, 2022, 42(4): 043101. doi: 10.11883/bzycj-2021-0051
Citation: YANG Zezhou, SHEN Yongfeng, FENG Xiaowei, XUE Wenying, XIE Ruoze, HU Yanhui. Investigation on dynamic tensile properties of an ultrafine grained D6A steel[J]. Explosion And Shock Waves, 2022, 42(4): 043101. doi: 10.11883/bzycj-2021-0051

超细晶D6A钢动态拉伸力学特性实验研究

doi: 10.11883/bzycj-2021-0051
详细信息
    作者简介:

    杨泽洲(1996- ),男,硕士研究生,yangzezhou19@gscaep.ac.cn

    通讯作者:

    冯晓伟(1984- ),男,博士,副研究员,414fengxw@caep.cn

  • 中图分类号: O347.3

Investigation on dynamic tensile properties of an ultrafine grained D6A steel

  • 摘要: 为了推进超细晶D6A钢在半穿甲战斗部壳体上的应用,研究了动态加载下其宏观力学行为和细观变形机理。运用旋转盘式Hopkinson拉杆技术,开展了超细晶D6A低合金钢(平均晶粒尺寸为510 nm)的动态拉伸实验,获得了不同应变率(500~1000 s−1)下超细晶钢的应力-应变曲线。运用TEM观测微观形貌,从细观层次研究了高应变率拉伸作用下超细晶钢的动态力学特性。结果表明,超细晶D6A钢具有较高的动态拉伸强度和良好的延展性。并且,晶粒细化和纳米析出相(渗碳体)是超细晶钢同时拥有高强度和较好韧性的重要因素;在动态拉伸过程中析出的大量纳米级渗碳体,与高密度晶界共同作用限制了位错运动,从而产生额外的塑性变形抗力,有效提升了超细晶钢的强度;在塑性变形阶段超细晶钢出现的明显应力下降现象,是可动位错密度增高的结果。
  • 图  1  钢退火组织的SEM形貌

    Figure  1.  The SEM morphologies of annealing structures of the steels

    图  2  钢的晶粒尺寸分布

    Figure  2.  Grain size distributions of the steels

    图  3  超细晶D6A钢组合试件照片

    Figure  3.  Photographs of the ultrafine grained D6A steel combined specimens

    图  4  霍普金森拉杆系统

    Figure  4.  The Hopkinson tension bar system

    图  5  不同应变速率下超细晶D6A钢的工程应力-应变曲线和真实应力-应变曲线[11]

    Figure  5.  Engineering and true stress-strain curves of the ultrafine grained D6A steels at different strain rates[11]

    图  6  超细晶D6A钢的高应变率应力-应变曲线

    Figure  6.  Stress-strain curves of the ultrafine grained D6A steel at high strain rates

    图  7  超细晶D6A钢在不同应变率下的强度和延伸率

    Figure  7.  Strengths and elongations of the ultrafine grained D6A steel at different strain rates

    图  8  超细晶D6A钢加载前后的TEM形貌

    Figure  8.  The SEM morphologies of the ultrafine grained D6A steel before and after loading

    图  9  超细晶D6A钢拉伸断口形貌

    Figure  9.  The tensile fracture morphology of the ultrafine grained D6A steel

    表  1  超细晶D6A钢化学成分的质量分数

    Table  1.   Mass fractions of chemical compositions in the ultrafine grained D6A steel

    w(C)/%w(Si)/%w(Mn)/%w(Cr)/%w(Mo)/%w(Al)/%w(Ni)/%w(V)/%w(Fe)/%
    0.430.170.731.051.010.020.610.0995.89
    下载: 导出CSV

    表  2  室温下超细晶D6A钢的准静态拉伸力学参数[11]

    Table  2.   Quasi-static tensile mechanical parameters of the ultrafine grained D6A steels at room temperature[11]

    温度/℃应变率/s−1屈服强度/MPa 拉伸强度/MPa 工程伸长率/%
    工程真实 工程 真实
    251.7×10−11110 1120 1120 1250 25
    251.7×10−211001115 1115 1245 25
    251.7×10−31095 1110 1110 1240 25
    下载: 导出CSV

    表  3  室温下超细晶D6A钢的动态拉伸力学参数

    Table  3.   Dynamic tensile mechanical parameters of the ultrafine grained D6A steel at room temperature

    温度/℃应变率/s−1强度/MPa伸长率/%
    25560196012.72
    25580195013.42
    25620198013.48
    25910221012.43
    25920198013.53
    251030 224012.37
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-02-02
  • 修回日期:  2021-05-11
  • 网络出版日期:  2022-03-30
  • 刊出日期:  2022-05-09

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