Si含量及配分处理对Q&P钢残留奥氏体量及性能的影响

Effect of Si content and partitioning process on the quantity of retained austenite and property of Q&P steels

通过研究在Q&P(quenching and partitioning,淬火-配分)工艺下3种不同Si含量Q&P钢的组织与性能,并与常规调质工艺进行了对比。利用XRD计算了不同Q&P工艺下钢中残留奥氏体含量,表明添加适量的Si以及利用Q&P工艺能保留较多的奥氏体至室温。配分的温度与时间对力学性能有着显著地影响。在320℃至460℃,随着配分温度的升高,强度逐渐降低,伸长率逐渐升高;在380℃的配分温度下,随着分配时间的延长,强度略有降低,伸长率有显著提高。

Microstructure and properties of different Si content steel treated by Q&P (quenching and partitioning) process were comparatively studied with that of the traditional process. The quantity of retained austenite of the specimens treated by different heat treatments was calculated by XRD. The results show that with the addition of Si and the utilization of Q&P process,more austenite can be retained at room temperature. The mechanical properties of the tested steels are affected by the temperature and time of partitioning. With the increase of the partition temperature from 320 ℃ to 460 ℃,the strength gradually decreases,and the elongation gradually increases. With the increase of the partition time at 380 ℃,the strength decreases slightly and the elongation increases significantly.