콘텐츠 본문
논문 국내 국내전문학술지(KCI급) 저탄소 Dual Phase강의 가공시효에 미치는 탄소유효확산 및 전위분포의 영향
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2021-10
- 저자명 홍기하공동(참여),유상협,정기채,박경태
- 학술지명 소성가공
- 발행처명 한국소성가공학회
- 발행국가 국내
- 논문언어 외국어
- 전체저자수 4
논문 초록 (Abstract)
The strain aging behavior of a low carbon dual phase steel was examined in two conditions: representing room temperature strain aging (100 ºC × 1 hr after 7.5 % prestrain) and bake hardening process (170 ºC × 20 min after 2 % prestrain), basing on carbon effective diffusion and dislocation distribution. The first principle calculations revealed that (Mn or Cr)-vacancy-C complexes exhibit the strongest attractive interaction compared to other complexes, therefore, act as strong trapping sites for carbon. For room temperature strain aging condition, the carbon effective diffusion distance is smaller than the dislocation distance in the high dislocation density region near ferrite/martensite interfaces as well as ferrite interior considering the carbon trapping effect of the (Mn or Cr)-vacancy-C complexes, implying ineffective Cottrell atmosphere formation. Under bake hardening condition, the carbon effective diffusion distance is larger compared to the dislocation distance in both regions. Therefore, formation of the Cottrell atmosphere is relatively easy resulting in to a relatively large increase in yield strength under bake hardening condition.
