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Volume 29Issue 4
Dec. 2020
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Article Navigation> JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY> 2020> 29(4): 568-580
Tao Wang, Lei Zhu, Changhong Wang, Mingming Liu, Ning Wang, Lingchao Qin, Hao Wang, Jianbo Lei, Jie Tang, Jun Wu. Microstructure Evolution and Dynamic Mechanical Properties of Laser Additive Manufacturing Ti-6Al-4V Under High Strain Rate[J]. JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2020, 29(4): 568-580. doi: 10.15918/j.jbit1004-0579.20064
Citation: Tao Wang, Lei Zhu, Changhong Wang, Mingming Liu, Ning Wang, Lingchao Qin, Hao Wang, Jianbo Lei, Jie Tang, Jun Wu. Microstructure Evolution and Dynamic Mechanical Properties of Laser Additive Manufacturing Ti-6Al-4V Under High Strain Rate[J].JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2020, 29(4): 568-580.doi:10.15918/j.jbit1004-0579.20064
shu

Microstructure Evolution and Dynamic Mechanical Properties of Laser Additive Manufacturing Ti-6Al-4V Under High Strain Rate

doi:10.15918/j.jbit1004-0579.20064
  • 1.

    College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China

  • 2.

    Qingdao International Airport Group Co. Ltd., Qingdao 266000, China

  • 3.

    Zhejiang Loong Airlines Co. Ltd., Hangzhou 311207, China

  • 4.

    Center of Engineering and Technology, Civil Aviation University of China, Tianjin 300300, China

  • 5.

    Research Center of Laser Technology, Tianjin Polytechnic University, Tianjin 300387, China

Funds:the United National Science Funds and Civil Aviation Funds (U1633104); Tianjin Science Funds for the Special of Science & Technology (17JCTPJC51800); Open Funds of the State Key Lab of Digital Manufacturing Equipment & Technology (DMETKF2017018); the Scientific Research Project of Tianjin Educational Committee (2019KJ119); the Fundamental Research Funds for the Central Universities (3122017017); Research Starting Funds of Civil Aviation University of China (09QD05S)
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  • Corresponding author:associate professor E-mail:hbgdwh@vip.126.com
  • Received Date:2020-06-23
  • Publish Date:2020-12-30
    Abstract
  • The dynamic mechanical properties of the Ti-6Al-4V (TC4) alloy prepared by laser additive manufacturing (LAM-TC4) under the high strain rate (HSR) are proposed. The dynamic compression experiments of LAM-TC4 are conducted with the split Hopkinson pressure bar (SHPB) equipment. The results show that as the strain rate increases, the widths of the adiabatic shear band (ASB), the micro-hardness, the degree of grain refinement near the ASB, and the dislocation density of grains grow gradually. Moreover, the increase of dislocation density of grains is the root factor in enhancing the yield strength of LAM-TC4. Meanwhile, the heat produced from the distortion and dislocations of grains promotes the heat softening effect favorable for the recrystallization of grains, resulting in the grain refinement of ASB. Furthermore, the contrastive analysis between LAM-TC4 and TC4 prepared by forging (F-TC4) indicates that under the HSR, the yield strength of LAM-TC4 is higher than that of F-TC4.
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