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采用定量拉伸、彩色金相、SEM、TEM和XRD对含铌低硅TRIP钢拉伸过程中的相变和应变硬化行为进行了研究。结果表明:在单向拉伸过程中,残余奥氏体的稳步相变使得塑性增加。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。
The phase transformation and strain hardening behavior of TRIP steel with niobium and low temperature during the tensile process were studied by quantitative tensile test, color metallography, SEM, TEM and XRD. The results show that in the uniaxial stretching process, the steady austenite transformation causes the plasticity to increase. The relationship between the rate of transformation of retained austenite and the true strain can be expressed as ln [(Vγ0-Vγ) / (Vγ0-Vγu)] = lnk-cε. As the strain proceeds, the value of c decreases and the retained austenite Increased stability. In the stage of uniform plastic deformation, the transient strain hardening exponent n * of TRIP steel is related to the residual austenite to martensite transformation with the change of true strain ε.