退火工艺对TRIP980冷轧钢板显微组织和力学性能的影响

以冷轧TRIP980钢为研究对象,探讨了退火温度、过时效温度和过时效时间对钢板组织性能的影响。结果表明:退火温度从800 ℃降低至760 ℃,随着奥氏体化程度的降低和原奥稳定性的增强,冷却后组织中硬相含量更低,残奥含量更高,宏观表现为拉伸强度降低、伸长率提高;过时效温度从360 ℃提高至400 ℃,随着贝氏体体积分数的提高,拉伸强度提高;过时效时间从600 s延长至1500 s,随着硬相贝氏体的软化和残奥稳定性增大,拉伸强度降低、伸长率提高。

Effect of annealing process on microstructure and mechanical properties of cold rolled TRIP980 steel plate

Effects of annealing temperature, over-aging temperature and over-aging time on the microstructure and mechanical properties of cold rolled TRIP980 steel plate were studied. It is found that when the annealing temperature decreases from 800 ℃ to 760 ℃, with the decrease of austenitizing degree and the enhancement of original austenite stability, the hard phase content becomes lower and the retained austenite content becomes higher, macroscopically showing that the tensile strength decreases and the elongation increases. When the over-aging temperature increases from 360 ℃ to 400 ℃, the strength increases with the increase of bainite volume fraction. When the over-aging time increases from 600 s to 1500 s, the hard phase bainite softens and the stability of retained austenite increases, which result in the tensile strength decrease and the elongation increase.