退火工艺对1200MPa级TRIP钢的组织和力学性能的影响

发布时间：2018-03-19 16:15

本文选题：TRIP钢　切入点：基体结构　出处：《材料热处理学报》2015年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Three kinds of TRIP steels with different matrix structures, polygonal ferrite based TRIP steel, bainitic ferrite based TRIP steel and tempered martensite based TRIP steel, were obtained by different annealing processes. The microstructure and mechanical properties of TRIP steels were studied. The microstructure of experimental steel is completely different due to the different annealing process, and the mechanical properties of TPF steel are also significantly different. The matrix structure of TPF steel is polygonal ferrite with large size. Bainite, martensite and a few residual austenite are distributed on the matrix of TPF steel. The tensile strength and elongation are lower than that of TBF steel and TAM steel. TBF steel is bainitic ferrite, and the residual austenite is distributed between bainite lath or long strip. The microstructure of Tam steel is composed of annealed martensite matrix, residual austenite and new martensite. The retained austenite is distributed in the grain boundary of annealed martensite or between the lath with stable long stripe or thin film. With the best mechanical properties.
【作者单位】：北京科技大学冶金工程研究院;现代交通金属材料与加工技术北京实验室;北京首钢冷轧薄板有限公司;
【基金】：国家自然科学基金(51271035,51371032)
【分类号】：TG161;TG142.1

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