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利用形变强化相变机制研究了两种锰含量不同的低碳锰钢过冷奥氏体在780℃,以10s-1的速率变形时,锰元素对相变完成时临界应变量εc的影响。结果表明,锰元素对εc的影响很大,主要表现为对组织演变和转变动力学的影响。锰含量增加,主要推迟了相变过程的进行,εc增大。低碳锰钢过冷奥氏体形变强化相变组织演变和转变动力学都分为两个阶段:第一阶段对应着曲线上的斜率接近4,铁素体在原奥氏体晶界形核;第二阶段在曲线上表现n值减小,大约1.0-2.0,对应着铁素体在奥氏体晶内高畸变区大量反复快速形核,直至相变完成。锰含量增加,铁素体晶粒细化显著。
The effect of manganese on the critical strain εc at the completion of phase transformation was investigated by means of the strain hardening mechanism when the two supercooled austenites of low carbon manganese with different Mn contents were deformed at 780 ℃ and 10s-1. The results show that manganese has a great influence on εc, which mainly shows the influence on the evolution and transformation kinetics. Manganese content increased, mainly delayed the phase change process, εc increased. The microstructure evolution and transformation kinetics of the undercooled austenite in low carbon manganese steel are all divided into two phases: the first phase corresponds to the slope on the curve being close to 4, and the ferrite nucleating on the original austenite grain boundaries; The second phase of the curve shows that the value of n decreases, about 1.0-2.0, which corresponds to a large number of repeated rapid nucleation of ferrite in the high-distortion region of austenite until the phase transformation is completed. Manganese content increased, ferrite grain refinement significantly.