한국재료학회지 (Korean Journal of Materials Research)

  • 제31권5호
  • /
  • Pages.245-254
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  • 2021
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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Improving Mechanical Properties of Wire Arc Additively Manufactured Ti-6Al-4V Alloy by Ultrasonic Needle Peening Treatment

  • Yi, Hui-Jun (Defense Manufacturing Engineering Team, Hyundai-Rotem Company) ;
  • Kim, Jin-Woo (Defense Manufacturing Engineering Team, Hyundai-Rotem Company) ;
  • Kim, Young-Lak (Strategy and Planning Division, KISWEL LTD.) ;
  • Shin, Sangyong (School of Materials Science and Engineering, University of Ulsan)
  • 투고 : 2021.03.17
  • 심사 : 2021.04.21
  • 발행 : 2021.05.27
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초록

Wire arc additive manufacturing (WAAM) is being considered as a technology to replace the conventional manufacturing process of titanium alloys. However, coarse β grains, which can extend through several deposited materials, result in strong textures and anisotropy. As a solution, we study the plastic deformation effects of ultrasonic needle peening (UNP) on the microstructure. UNP treated materials deform plastically and the dislocation density increases. Fine α+α' grains with low aspect ratio are observed in the UNP treated specimens. UNP treated WAAM Ti-6Al-4V alloys have higher strength and lower elongation than those characteristics of WAAM Ti-6Al-4V alloys. Due to UNP treatment, the z-axis directional specimens exhibit a greater effect of reducing elongation than do the x-axis directional specimens. The UNP treatment produces fine grains in proportion to the number of times UNP is performed, thereby increasing strength. UNP processes produce a large number of dislocations in the WAAM Ti-6Al-4V alloys, with the most dislocations being formed at the surface.

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