抄録
Time-temperature-austenitization diagrams (T-T-A Diagrams) of variously pre-worked 0.73 per cent carbon steels were obtained to provide a guide for rapid heating and quenching operation. The experimental procedure was the same as in one of the previous reports. Experimental results are as follows:
(1) Austenitization of 80 per cent cold-drawn starts and finishes in the shortest time, followed by as-quenched one, 40 per cent cold-drawn one, quenched and 500°C tempered one, and annealed one needs the longest time for austenitization. (2) The above results is related to the fine structure which depends upon the degree of pre-cold-working. Pre-cold-working is effective for rapid heating and quenching.
