Mo含量对Ti微合金低碳钢力学性能的影响

Effect of Mo content on mechanical properties of Ti micro-alloyed low carbon steel

对Ti微合金钢和不同Mo/Ti原子配比的Ti-Mo合金钢进行组织观察和力学性能分析,并利用透射电镜对钢中析出的纳米级的碳化物粒子的形貌分布进行分析。结果表明,在Ti微合金钢中添加Mo能够使钢的强度显著提高;在Ti含量一定的条件下,随着Mo的增加,钢的屈服强度和抗拉强度呈先增大后减小趋势;Mo/Ti的原子比值分别为0.7、1.1和1.3时,钢的力学性能在原子比值为1.1时最优,其抗拉强度达825 MPa。

Microstructure and mechanical properties of Ti micro-alloyed low-carbon steel and Ti-Mo steels with different Mo/Ti atomic ratio proportion were investigated, and morphology, distribution of nanometer-sized carbides were studied by transmission electron microscope ( TEM) .The results show that the strength of the Ti micro-alloyed steel increases significantly by adding Mo.When the Ti content is a constant, the tensile strength and yield strength of the steel firstly increase and then descend with the increase of Mo content.Among the Mo/Ti atomic ratio of 0.7, 1.1 and 1.3, the mechanical properties of the tested steel with an Mo/Ti atomic ratio of 0.7 are the best, the tensile strength of which can achieve 825 MPa.