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以超高强度钢22SiMn2TiB为对象,研究了在淬火、回火和配分状态下组织的演变规律。采用光学金相显微镜(OM)、扫描电镜(SEM)和X射线衍射技术(XRD)研究了不同处理状态下组织的演变规律。实验表明,回火或配分温度低于320℃,板条马氏体组织形貌没有明显变化,且不随回火和配分时间的变化而变化;在此温度以上进行配分,不论配分时间的长短,组织皆转变为回火组织。表明320℃为该钢材的临界回火、配分温度。随着回火温度的升高,位错密度下降;且320℃以下温度回火或配分,马氏体衍射峰的半峰宽FWHM只是略有减少,表明虽然板条马氏体的组织形貌没有明显变化,但板条内的位错密度和内应力降低。
Taking the ultra-high-strength steel 22SiMn2TiB as an example, the evolution of microstructure under quenching, tempering and compounding conditions was studied. The evolution of microstructure under different treatment conditions was investigated by OM, SEM and XRD. Experiments show that tempering or partitioning temperature is below 320 ℃, lath martensite morphology does not change significantly, and does not change with tempering and partitioning time; above this temperature with the allocation of points, regardless of the length of time, Organizations are transformed into tempered organizations. That the critical temperature of 320 ℃ for the steel, with the temperature. With the increase of tempering temperature, the density of dislocation decreases. When the temperature is below 320 ℃, the full width at half maximum (FWHM) of the martensite diffraction peak decreases only slightly, indicating that although the martensite morphology There was no significant change, but the dislocation density and internal stress in the slab decreased.