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采用SEM、TEM、EBSD、XRD等手段,研究了Q-P-T工艺配分温度(320、380和450℃)对28Mn2SiCrNiMo钢组织及性能的影响规律。结果表明:试验钢在320℃配分后,获得针状下贝氏体+马氏体+残留奥氏体组织;380℃配分后,获得板条状上贝氏体+马氏体+残留奥氏体组织;450℃配分后,组织为马氏体+残留奥氏体,无贝氏体生成。当配分温度为320℃时,强度、塑性和韧性的配合达到最佳,强度为1524MPa,总伸长率为18.7%,V型缺口冲击功为58J。配分过程中贝氏体的形成,分割原奥氏体晶粒,细化组织,阻碍了裂纹的扩展,使得试验钢的冲击韧性大幅提升。
The effects of Q-P-T process temperature, 320, 380 and 450 ℃ on the microstructure and properties of 28Mn2SiCrNiMo steel were studied by means of SEM, TEM, EBSD and XRD. The results show that acicular bainite + martensite + retained austenite microstructure is obtained when the test steel is dosed at 320 ℃. The microstructure of slab-shaped upper bainite + martensite + residual austenite Body tissue; 450 ℃ with points, the organization of martensite + retained austenite, no bainite formation. When the compounding temperature is 320 ℃, the strength, ductility and toughness with the best, the intensity of 1524MPa, the total elongation of 18.7%, V-notch impact energy of 58J. Partitioning process of bainite formation, the division of the original austenite grains, refine the organization, hinder the expansion of the crack, making the impact toughness of the test steel increased dramatically.