Abstract
The microstructure of the 1020 mild-steel target, in the region ahead of craters made by colliding against Cu and W-Cu shaped-charge jets, has been investigated in the present work. The region ahead of the crater impacted by the Cu shaped-charge jet reveals grain refinement, implying the formation of subgrains, while that of the W-Cu one leads to a martensitic transformation, indicating that the region was heated to an austenitic region, followed by rapid cooling. The pressure of the W-Cu shaped-charge jet impacting against the target, when calculated, is higher than that of the Cu one. The microhardness of the region ahead of the crater impacted by the W-Cu shaped-charge jet is also higher than that of the Cu one. The microstructure of the W-Cu slug that remains inside of the crater depicts the occurrence of the remarkable elongation of W particles during the liner collapse. The microstructural evolution of the region ahead of the crater is discussed on the basis of the pressure dependency of the ferrite/austenite transformation in the steel.
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