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以含铌低硅TRIP钢为研究对象，利用定量拉伸、彩色金相、SEM、TEM和XRD等技术手段，研究了TRIP钢的拉伸性能，拉伸过程中的相变和应变硬化行为。结果表明，含铌低硅 TRIP钢具有高强度和良好的塑性，抗拉强度达到700MPa级别的同时总延伸率在34%以上。在单向拉伸过程中，残余奥氏体的相变速率与真应变的关系可以用ln[(Vγ0-Vγ)/(Vγ0-Vγu)]=lnk-cε来表示，随应变的进行，c值减小，残余奥氏体的稳定性增加。在均匀塑性变形阶段，TRIP钢的瞬时应变硬化指数n*值随真应变ε的变化与残余奥氏体向马氏体相变量有关。

By means of quantitative tension, tint-etched metallograph, SEM, TEM and XRD techniques, the tensile properties, transformation behavior and strain hardening behavior during tensile straining of low silicon TRIP steel contained niobium were investigated. The results indicated that this kind of TRIP steel combines high strength and high ductility, while tensile strength can reach 700MPa level, total elongation is above 34％. The relationship between the transformation rate of retained austenite and true strain in uniaxial tensile can be expressed as ln[(Vγ0-Vγ)/(Vγ0-Vγu)]=lnk-cε, as the strain increases, the c value determining the transformation rate decreases, the stability of retained austenite is strengthened. During uniform plastic deformation, Variation of instantaneous strain hardening n* value versus true strain ε has a relation with the martensitic transformation volume fraction of retained austenite.