In this study, bottom-up powder processing and top-down severe plastic deformation processing approaches were combined in order to achieve both full density and grain refinement with least grain growth. The numerical modeling of the powder process requires the appropriate constitutive model for densification of the powder materials. The present research investigates the effect of representative powder yield function of the Shima-Oyane model and the critical relative density model. It was found that the critical relative density model is better than the Shima-Oyane model for powder densification behavior, especially for initial stage.

• 복천희 | Bok Cheon-Hee
• 유지훈 | Yoo Ji-Hoon
• 윤승채 | Yoon Seung-Chae
• 김택수 | Kim Taek-Soo
• 천병선 | Chun Byong-Sun
• 김형섭 | Kim Hyoung-Seop