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Abstract
A casting procedure has been developed which enables structures typical of those found in commercial ingots to be obtained in large-size tensile specimens which can be broken out of the moulds either hot or cold before reheating to simulate hot or cold charging practice. High strain-rate tensile tests were carried out in specially designed grips using a vertical extrusion press. Results for 1C-Cr steel showed no significant differences after hot and cold charging, whereas for aluminium-treated 3.5Ni-Cr-Mo steel, hot-charged specimens were always less ductile than specimens that had transformed before testing. AIN precipitation had a deleterious effect on the ductility of the latter steel.
