STUDY OF INFLUENCE OF CRYOGENIC BATH IN THE AISI H13 STEELS PROPERTIES

摘要

The present work is to study the influence of cryogenic treatment on AISI H13 hot work steel. To this end several cycles of heat treatments were performed with conventional quenching and tempering and cryogenic treatment. In some samples the cryogenic treatment is done before tempering, in others after, with soaking times of 1 hour, 24 hours and 48 hours. To evaluate the efficiency of cryogenic treatment on AISI H13 steel, the hardness, Charpy impact and wear resistance were compared with those from heat-treated AISI H13 conventionally. The results were analyzed, compared and discussed. We conclude that the cryogenic bath did not add improvements over hardness values obtained with conventional treatment. The cryogenic treatment performed in conjunction with heat treatments of quenching and tempered may increase about 20% the energy of impact, and the soaking time of the bath cryogenic not presented positively influence this process, because the best value of impact energy wascryogenic bath was lasting an hour. The best wear resistance was presented by the stay of 48 hours in the bath after cryogenic tempering.