TRIP钢在连续冷却过程中的相变行为

与普通C-Mn不同,热轧生产TRIP钢需要着重考虑合金质量分数、冷却速率和剩余奥氏体碳浓度对相变行为的影响.以Avrami方程为基础,确定了热轧低碳Si-Mn系TRIP钢相变动力学模型参数,并定量地分析了不同w(Si)、变形量和冷却速率对热变形奥氏体相变的影响.应用该模型预测的CCT曲线与实测值符合得较好.计算结果表明,w(Si)或变形量增加都会促进铁素体相变,从而有利于剩余奥氏体中碳质量分数的增加.

Phase Transformation Behavior of Low-Carbon Si-Mn TRIP Steel During Continuous Cooling

The kinetics of work-hardened austenite transformation of TRIP(transformation induced plasticity) steel is different from the conventional C-Mn steel in their alloy contents,cooling rates and carbon contents in residual austenite,and all the differences should be emphasized for the TRIP steel.Based on the Avrami equation,the parameters of the kinetic model of phase transformation of hot-rolled Si-Mn TRIP steel were determined,and the influences of Si content,hot deformation and cooling rate on the phase transformation of hot deformed austenite were quantitatively investigated.The CCT curves predicted by the model showed that they are in good agreement with experimental ones.The calculation results show that the increase in either Si content or deformation benefits the ferritie transformation hence the carbon enrichment in residual austenite.