Shock Induced Phase Transition of Pure Iron and Fe-Based Alloy Cuneal Samples

Planar detonation wave was generated to load the DT2 iron and HR2 steel cuneal sample by detonating TNT. Macroscopical crack perpendicular or 45 angle to the load interface was found in recovered HR2 steel sample and irregular fracture at back surface was found in recovered DT2 iron sample. Metallographic structure observation, microhardness measurement of recovered sample and numerical simulation indicate that there was no shock-induced phase transition in HR2 steel but local incomplete phase transition in DT2 iron. The failure difference between the two materials may be caused by local incomplete phase transition.