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研究了不同Ti含量对微合金钢的力学性能的影响规律,并采用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。结果表明:含Ti微合金低碳钢随着钢中Ti含量的增加,钢材的屈服强度、抗拉强度、屈强比都有不同程度的增加,且以Ti含量为0.042%为界,屈服强度和抗拉强度的增长趋势显著增加,主要是因为Ti含量大于0.042%时,富余的Ti与C元素结合析出颗粒细小的Ti C颗粒,起到强烈的沉淀强化作用;伸长率随Ti含量的增加减小,其降低的程度也随Ti含量减小,原因是Ti含量较低时析出的Ti N、Ti4C2S2尺寸较大,引起的脆化效应要远强于Ti C。Ti C颗粒的沉淀强化作用使试验钢强度显著增加,伸长率略有下降。
The effects of different Ti contents on the mechanical properties of microalloyed steels were studied. The reason for the change was analyzed by Hall-Petch grain refinement model and Ashby-Orowan precipitation hardening model. The results show that the yield strength, tensile strength and yield ratio of steel with Ti microalloyed low carbon steel increase with the increase of Ti content, and the Ti content is 0.042%, the yield strength And tensile strength increased significantly, mainly due to the Ti content of more than 0.042%, the excess Ti and C elements precipitation of small particles of TiC particles, played a strong precipitation strengthening; elongation with Ti content The decrease of TiN and Ti4C2S2 decreases with the decrease of Ti content. The reason is that TiN and Ti4C2S2 are precipitated when Ti content is low, which leads to much stronger embrittlement effect than TiC. The precipitation strengthening effect of TiC particles significantly increased the strength of the test steel, the elongation decreased slightly.