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研究了不同温度和时间的淬火-配分(Q-P)处理工艺对新型高硅(Si含量为0.82 mass%)热成形钢组织与力学性能的影响,采用光学显微镜(OM)和扫描电镜(SEM)对试样的微观组织进行了观察。结果表明,材料为板条马氏体+残留奥氏体组织,存在较多的M/A岛。当淬火温度为260℃,配分300 s时,材料的强塑积最高,达到22.3 GPa·%,且伸长率为13.3%,远高于商用热成形钢的6.6%。XRD和磁性法测得该处理条件下的残留奥氏体含量分别为5.2%和7.98%,透射电子显微镜(TEM)观察到薄膜状残留奥氏体。分析表明,淬火-配分处理后,保留至室温的富碳残留奥氏体对于提高材料的塑性起到了主要作用。
The effect of quenching - partitioning (QP) process with different temperature and time on the microstructure and mechanical properties of a new high silicon (0.82 mass% Si) thermoformed steel was investigated. Optical microscopy (OM) and scanning electron microscopy The microstructure of the sample was observed. The results show that the material is lath martensite + retained austenite, there are more M / A islands. When the quenching temperature is 260 ℃, the material has a maximum plastic modulus of 22.3 GPa ·% and an elongation of 13.3%, which is much higher than 6.6% of commercial thermoformed steel. The residual austenite content under the treatment conditions was 5.2% and 7.98%, respectively, as determined by XRD and magnetic methods. The retained austenite was observed by transmission electron microscopy (TEM). The analysis shows that the carbon-rich retained austenite retained to room temperature after quenching-partitioning treatment plays a major role in improving the plasticity of the material.