A 01 tool steel has been studied for its superplastic characteristics for three different structures: (a) a coarse spheroidized-annealed structure; (b) a structure of fine spheroidized cementite particles and fine ferrite grains containing both high- and low-angle boundaries; and (c) a structure of fine spheroidized cementite particles and fine ferrite grains containing only high-angle boundaries. Optimum superplastic properties were obtained for the fine-grain-size steel containing high-angle boundaries. The 01 tool steel in this condition exhibited a strain-rate-sensitivity exponent of 0·5 and a maximum elongation to failure of 1200% at 650°C.
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