Abstract

The mechanical and impact properties of ASTM A285 Grade C and A515 Grade 70 steels were determined after either explosive forming or statically straining to the same level of effective strain. After explosive forming and a standard stress relief anneal, both steels met boiler code specifications. Statically prestraining reduced the impact strength of the A285 steel, whereas explosively formed A285 steel had impact properties comparable to as-received stock. The impact properties of A515 steel strained to about 4 pct effective strain were comparable regardless of method of strain introduction. At strain levels of 35 pct strain the cold-rolled A515 steel had greater impact resistance and lower DBT values than explosively formed steel.

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