Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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The Effect of Interpass Peening on Mechanical Properties in Additive Manufacturing of Ti-6Al-4V

Ti-6Al-4V의 AM에서 기계적 성질에 미치는 Interpass Peening의 영향

  • Byun, Jae-Gyu (Dept. of Materials System Engineering, Graduate School, Pukyong National Univ.) ;
  • Yi, Hui-jun (Defense Inducstrial Division, Hyundai Rotem Company) ;
  • Cho, Sang-Myung (Dept. of Materials System Engineering, Pukyong National University)
  • 변재규 (부경대학교 대학원 신소재시스템공학과) ;
  • 이희준 (현대로템(주) 중기사업본부) ;
  • 조상명 (부경대학교 신소재시스템공학과)
  • Received : 2017.04.04
  • Accepted : 2017.04.24
  • Published : 2017.04.30
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Abstract

Ti-alloys have high specific strength and are widely used for the filed of space aeronautics plant. However, it is difficult to process Ti-Alloys due to its high yield strength and it cannot raise the machining speed because it has a possibility of catching fire while processing. In order to reduce the number of processes for the Ti-alloys, the researches related to Additive Manufacturing(AM) have been actively carried out at the moment. As for the initial stage of AM market related to Ti-alloys, it started to use the raw material of powder metal, and it is currently being developed based on welding. In this study, Interpass peening reduced the size of the primary ${\beta}$ grain in the z-axis direction, increased the nucleation site of ${\alpha}-colony$, and decreased the length and width of ${\alpha}$ laths as though interpass rolling. Interpass peening leads to an increase in yield/ultimate tensile strength without decrease elongation, resulting decrease in anisotropy of the material.

Keywords

References

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