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在不同温度下对Ti微合金钢进行等温卷取,利用扫描电镜、透射电镜和能谱仪等对钢的组织结构和析出物的形貌分布进行观察分析。结果表明,随着卷取温度的降低,Ti微合金钢的屈服强度和抗拉强度升高,而断后伸长率随之降低;细晶强化和析出强化对钢的屈服强度的贡献最大,在600℃卷取等温1 h时,析出强化对总的屈服强度的增量超过200 MPa;铁素体基体存在大量纳米尺寸的TiC析出颗粒,这种纳米碳化物是析出强化的主要来源。
The isothermal coiling of Ti microalloyed steel was carried out at different temperatures. The microstructures and morphologies of the precipitates were observed and analyzed by SEM, TEM and EDS. The results show that with the decrease of coiling temperature, the yield strength and tensile strength of Ti microalloyed steel increase, while the elongation at break decreases. The fine grain strengthening and precipitation strengthening have the greatest contribution to the yield strength of steel. When the isothermal temperature is 600 ℃ for 1 h, the increment of precipitation strengthening to the total yield strength exceeds 200 MPa. There is a large amount of TiC precipitates in the ferrite matrix, which is the main source of precipitation strengthening.