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롤 아연된 STS-Al-Mg 이종금속판재의 온도와 변형률속도에 따른 1축인장 변형특성

Temperature and Strain Rate Dependent Tension Properties of Stainless Steel-Aluminum-Magnesium Multilayered Sheet Fabricated by Roll Bonding

  • 황범규 (한국기계연구원 부설 재료연구소 변형제어연구그룹) ;
  • 이광석 (한국기계연구원 부설 재료연구소 변형제어연구그룹) ;
  • 홍순익 (충남대학교 나노소재공학과) ;
  • 이영선 (한국기계연구원 부설 재료연구소 변형제어연구그룹)
  • 투고 : 2011.04.22
  • 심사 : 2011.05.23
  • 발행 : 2011.06.01

초록

Multilayer(clad) sheets, composed of two or more materials with different properties, are fabricated using the roll-bonding process. A good formability is an essential property for a multilayered sheet in order to manufacture parts by plastic deformation. In this study, the influences of temperature and strain rate on the plastic properties of stainless steel-aluminum-magnesium multilayered(STS-Al-Mg) sheets were investigated. Tensile tests were performed at various temperatures and strain rates on the multilayered sheet and on each separate layer. Fracture of the multilayered sheet was observed to be temperature-dependent. At the base temperature of $200^{\circ}C$, all materials fractured simultaneously. At lower temperatures, the Mg alloy sheet fractured earlier than the other materials. Conversely, the other materials fractured earlier than the Mg alloy sheet at higher temperatures. The uniform and total elongations of the multilayered sheet were observed to be higher than that of each material at a temperature of $250^{\circ}C$. Larger uniform elongations were obtained for higher strain rates at constant temperature. The same trend was observed for the Mg alloy sheet, which exhibited the lowest elongation among the three materials. The tensile strengths and elongations of the single layer sheets were compared to those of the multilayer material. The strength of the multilayered sheet was successfully calculated by the rule of mixture from the values of each single layer. However, no simple correlation between the elongation of each layer and that of the multilayer was obtained.

키워드

참고문헌

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피인용 문헌

  1. Prediction for Thickness and Fracture of Stainless Steel-Aluminum-Magnesium Multilayered Sheet during Warm Deep Drawing vol.21, pp.1, 2012, https://doi.org/10.5228/KSTP.2012.21.1.49