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利用OM,SEM和TEM等研究了动态相变后的冷却速率对基于动态相变的热轧TRIP钢组织控制影响。结果表明,动态相变后的冷却过程中,亚稳的未相变奥氏体会继续以形核为主的方式发生铁素体相变,随着冷却速率的降低,铁素体体积分数增多,铁素体晶粒内的位错回复较为充分,但铁素体晶粒尺寸变化不大,控制一定的冷却速率(30℃/s),可使实验钢组织中铁素体体积分数及位错密度适中,残余奥氏体体积分数较高,具有较好的强度及塑性。
The influence of the cooling rate after dynamic phase change on the microstructure control of hot rolled TRIP steel based on dynamic phase transition was studied by means of OM, SEM and TEM. The results show that during the cooling process after the dynamic phase transition, the metastable austenite will continue to ferrite transformation in a nucleation-dominated manner. As the cooling rate decreases, the volume fraction of ferrite increases , The dislocation recovery in the ferrite grains is more sufficient, but the ferrite grain size does not change much. Controlling the cooling rate (30 ℃ / s) can make the ferrite volume fraction and dislocation Moderate density, high residual austenite volume fraction, with good strength and plasticity.