Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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A Study on the Microstryctural Evoulution of the Reagion Aheas of Craters Created by Copper and W-Cu Shaped Charge Jets

W-Cu와 Cu의 고속 충돌에 의한 연강의 미세조직 변화

  • Lee, Seong (4-5-2 Division for Structural Materials Research and Development, Agency for Defense Development) ;
  • Hong, Moon-Hee (4-5-2 Division for Structural Materials Research and Development, Agency for Defense Development) ;
  • Baek, Woon-Hyung (4-5-2 Division for Structural Materials Research and Development, Agency for Defense Development)
  • Published : 1999.03.01
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Abstract

The microstructure of the reagion of carters, created by Cu and W-Cu shaped charge jets, in a 1020 mild steel target has been intestiaged. The region ahead of the crater created by the Cu shaped charge jet, reveals dramatic grain refinement implying the occurrence of a dynamic recrystallization, while that of W-Cu one dose a martensitic transformation indicative of heating up to an austenitic region followed by rapid cooling.The impacting pressure calculated when the W-Cu shaped charge jet encounters the target is higher than that of the Cu one. The micro-hardness of the region ahead of the crater created by the W-Cu shaped charge jet is also higher than that of the Cu one. The microstructure of W-Cu slug remained in the inside of the craters depicts the occurrence of the remarkable elongation of W particles during the liner collaphse. From these results, the microstructural variation of the region ahead of the crater with Cu and W-Cu shaped charge jets is discussed in trems of the pressure dependency of the transformation region of ferrite and austenite phases.

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