Influence of Heat Treatment and Carbon Content on the Hot Ductility of l\lb-Ti Microalloyed Steels

Abstract

The influence of Cand heat treatment on the hot ductility of Nb-Ti microalloyed steels, in the temperature range 800 to 1300°C, wasinvestigated by tensile testing at low strain rates, TheCrange was, varied between0.07 and 0.1 4wt% (peritectic composition). The heat treatments involved direct heating to, the test temperature, annealing at 1330°C and subsolidus reheating at 1480°C, The increase of the C, content to 0.14wt% slightly affects the hot ductility after the direct heating and annealing treatments., However, after subso]idus reheating, the width of the ductility trough is increased in the 0.1 4wt% Csteel., This effect is attributed to the coarser austenite structure inherited from this prior heat treatment. © 1993, The Iron and Steel Institute of Japan. All rights reserved.