配分温度对于Q&P钢成形性的影响规律

利用扫描电镜、连续退火模拟试验机和成形试验机研究了配分温度对Q&P钢组织和成形性能的影响,结果表明,不同的配分温度会使得Q&P钢获得不同的残余奥氏体体积分数,当配分温度为300~450 ℃时,残余奥氏体的体积分数为8.79%~12.19%,次应变相同的情况下,FLC曲线的单向应变区主应变最大提升0.09,双向应变区主应变最大提升0.05,平面应变区主应变提升不显著。配分温度主要通过影响残余奥氏体体积分数使FLC曲线位置发生变化,残余奥氏体体积分数的增加提高了Q&P钢的成形性能。

Influence of partition temperature on formability of Q&P steel

The effect of annealing partition temperature on the microstructure and formability of Q&P steel was studied by SEM, a continuous annealing machine and a forming test machine. Experimental research showed that different partition temperatures caused different volume fractions of residual austenite in Q&P steel. When the partition temperature is in the range of 300-450 ℃, the volume fraction of residual austenite varied from 8.79% to 12.19%. On the condition of the same secondary strain, the plane strain point of the FLC curve did not change significantly. The max main strain at the unidirectional strain point increased by 0.09, and the max main strain at the bidirectional strain point increased by 0.05. The effect of the partition temperature on the residual austenite volume fraction caused the variation of the position of the FLC curve, and the increase of the residual austenite volume fraction improved the formability of Q&P steel.