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논문 기본 정보

자료유형
학술저널
저자정보
김순태 (강릉원주대학교) 권상철 (강릉원주대학교) 김다빈 (강릉원주대학교) 이성 (국방과학연구소) 최시훈 (순천대학교) 정효태 (강릉원주대학교)
저널정보
한국소성·가공학회 소성·가공 소성가공 제27권 제6호(통권 제178호)
발행연도
2018.12
수록면
347 - 355 (9page)

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This study investigated the effects of the processing number of multi-axial diagonal forging (MADF) on the microstructural changes of OFC fabricated by MADF processes. The as-extruded OFC was cut to 25 mm³ cube for the MADF processes. The MADF process consists of plane forging with a thickness reduction of 30% and diagonal forging with a diagonal forging angle of 135 °. In order to analyze the microstructural evolutions according to the number of repetitions, 1, 2, 3 and 4 cycles of the MADF process were performed. OFC specimens were successfully deformed without surface cracking for up to 4 cycles of MADF. The grain size, average misorientation and average grain orientation spread (GOS) of MADF processed materials were analyzed using EBSD technique and their Vicker’s hardness were also measured. The results showed that MADF process effectively refined the microstructure of OFC with initial average grain size of 84.2㎛. The average grain sizes of specimens MADF processed for 1, 2, 3, 4 cycles were refined to be 8.5㎛, 2.2㎛, 1.5㎛, 1.1㎛, respectively. The grain refinement seemed to be saturated when OFC was MADF processed over 2 cycles. In the case of specimens subjected to two or more cycles of MADF, the degree of decrease in average grain size was drastically reduced as the number of cycles increased due to softening phenomena such as dynamic recovery or dynamic recrystallization during processing. The degree of increase in average Vicker’s hardness was also dramatically reduced as the number of cycles increased due to the same reason.

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Abstract
1. 서론
2. 실험방법
3. 실험결과 및 고찰
4. 결론
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