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采用不同的退火工艺得到了多边形铁素体基TRIP钢(TPF)、贝氏体铁素体基TRIP钢(TBF)和回火马氏体基TRIP钢(TAM)3种不同基体结构的TRIP钢,并对它们的显微组织和力学性能进行研究。结果表明,退火工艺的不同导致实验钢的微观组织完全不同,力学性能也存在显著差异。TPF钢的基体结构为尺寸较大的多边形铁素体,其上分布着贝氏体、马氏体及少部分残留奥氏体,抗拉强度和伸长率均低于TBF钢与TAM钢。TBF钢的基体结构为贝氏体铁素体,残留奥氏体呈长条状或块状分布于贝氏体板条间,表现出高强度但伸长率不佳。TAM钢组织由退火马氏体基体、残留奥氏体及新生马氏体组成,残留奥氏体以稳定的长条状或薄膜状分布在退火马氏体晶界处或板条间,具有最佳的力学性能。
Three kinds of TRIP steels with different matrix structures of polygonal ferrite-based TRIP steel (TPF), bainitic ferrite-based TRIP steel (TBF) and tempered martensite-based TRIP steel (TAM) were obtained by different annealing processes. , And their microstructure and mechanical properties of the study. The results show that the different microstructure of the experimental steel caused by the different annealing process have significant differences in mechanical properties. The matrix structure of TPF steel is large size polygonal ferrite, which contains bainite, martensite and a small amount of retained austenite. The tensile strength and elongation of TPF steel are lower than that of TBF steel and TAM steel. The basic structure of TBF steel is bainitic ferrite. The retained austenite is elongated or lumpy distributed between bainite laths, showing high strength but poor elongation. TAM steel microstructure consists of annealed martensite, retained austenite and fresh martensite, retained austenite in a stable strip or film distribution in the annealed martensite grain boundaries or between the slats, with the most Good mechanical properties.