【作者】 任家宽； 吴思炜； 陈其源； 周晓光； 刘振宇；

【Author】 Ren Jiakuan;Wu Siwei;Chen Qiyuan;Zhou Xiaoguang;Liu Zhenyu;School of Materials Science & Engineering, Northeastern University;

【机构】 东北大学材料科学与工程学院；

【摘要】 研究了Ti含量对低碳钢组织及力学性能的影响,并通过Hall-Petch细晶强化公式和Ashby-Orowan沉淀强化模型分析其变化规律的原因,在传统C-Mn钢力学性能预测模型的基础上,开发Ti微合金钢的力学性能预测模型,并对含Ti钢Q345B力学性能进行预测。结果表明,随Ti含量的增加,低碳钢的屈服强度、抗拉强度以及屈强比都有不同程度的增加,延伸率降低。细晶强化对强度贡献最大,而铁素体中析出TiC粒子的沉淀强化作用是导致实验钢强度以Ti=0.042%为界呈现显著差异的主要原因。力学性能预测模型对含Ti钢Q345B的屈服强度和抗拉强度预测相对误差分别达到±8%和±6%,准确度高,稳定性可靠。更多还原

【Abstract】 Studying on the influence of different Ti content on mechanical properties of Ti microalloyed low carbon steels, Hall-Petch grain refinement formula and Ashby-Orowan precipitation strengthening model are carried out to analyse the reason for the variation. Based on the prediction model of mechanical properties of traditional C-Mn steel, the mechanical properties prediction model of Ti microalloyed steel is developed, and the mechanical properties of Ti steel Q345B are predicted. The results show, with the increase of Ti content, the yield strength, tensile strength and yield ratio of low carbon steel all increase to different degrees, and the elongation decreases. The strengthening effect of fine grain has the greatest contribution to the strength, and the precipitation strengthening effect of TiC particles is the main reason for the significant difference of Ti = 0.042%. The relative error of YS and TS for the prediction of Q345B steel is within ± 8% and ± 6%, respectively, and the accuracy is high and the stability is reliable.更多还原