| Title |
Annealing Characteristics of Oxygen Free Copper Sheet Processed by Differential Speed Rolling |
| Authors |
이성희(Seong Hee Lee); 윤대진(Dae Jin Yoon); 어광준(Kwang Jun Euh); 김수현(Su Hyun Kim); 한승전(Seung Zeon Han) |
| DOI |
https://doi.org/10.3365/KJMM.2010.48.01.077 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Differential speed rolling; oxygen free copper; annealing; strain; hardness |
| Abstract |
Annealing characteristics of an oxygen free copper (OFC) processed by differential speed rolling (DSR) were investigated in detail. An OFC sample with a thickness of hum was rolled to 35% reduction at ambient temperature without lubrication, varying the differential speed ratio from 1.0:1 to 2.2:1, and then annealed for 0.5h at various temperatures from 100 to 400℃. Different recrystallization behavior was observed depending on the differential speed ratio, especially in the case of annealing at 200℃ Complete recrystallization occurred in the specimens annealed at temperatures above 250℃ regardless of the differential ratios. The hardness distribution in the thickness direction of the rolled OFC sheets varied depending on the differential speed ratios. These annealing characteristics were explained by the magnitude of shear strain introduced during rolling. |