논문 국내 국내전문학술지(KCI급) Ti-6Al-4V 판재에 Vanadium의 레이저 고에너지 적층 경로에 따른 잔류응력 특성
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2022-11
- 저자명 김정한,윤지홍,김성훈,이세환
- 학술지명 한국기계가공학회지
- 발행처명 한국기계가공학회
- 발행국가 국내
- 논문언어 한국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
Laser directed energy deposition (L-DED) has the advantages of complex shape production and easy stacking of dissimilar materials, but the reduction in residual stress owing to the rapid temperature change and difference in the thermal expansion behavior between materials should be considered. In this study, the residual stress characteristics according to the tool path in dissimilar materials of a Ti-6Al-4V plate and vanadium were compared and evaluated using finite element analysis. A vanadium layer was stacked on a Ti-6Al-4V plate using the L-DED method, and the simulation reliability was confirmed by comparing the temperatures under the same conditions. To compare the effect of the tool path on the residual stress, the zigzag path, spiral in-to-out (spiral IO), and spiral out-to-in (spiral OI) were simulated. Every path showed high residual stress in the outer area, and spiral IO had a low residual stress level and was uniform throughout the entire area. Therefore, the tool path when the outer area is stacked later similar to the spiral IO, was confirmed to be better for delamination and residual stress reduction. In the case of the zigzag path, the residual stress could be reduced on the final path, and the build-up speed was faster, but a high residual stress was generated on the starting path.