Por: MOHAMMAD MASOUMI (UFABC), Dany Centeno (IPT), Gustavo Tressia (ITV), Felipe Moreno Carvalho (IPT), Fabiano Eduardo Marques Cezario (UFABC)
Resumo:
This study investigates the phase transformations and microstructural development of SAE 9254 steel subjected to various heat treatments aimed at achieving a combination of bainitic, martensitic, and retained austenitic phases. The critical austenitization and quenching temperatures, along with the holding times, were determined using a dilatometer to observe the steel's phase transformation behavior. An austenitization temperature of 850°C with a holding time of 180 seconds and a quenching temperature of 220°C were established. Two isothermal holding temperatures at 325°C and 375°C, with holding times of 30 and 15 minutes respectively, were chosen for the partitioning process after quenching.