硼和钛对低碳铝镇静钢组织和性能的影响

 研究了低碳铝镇静钢08Al中单独添加硼、钛和同时添加硼、钛对其组织和力学性能的影响，结果显示，在相同控轧控冷工艺条件下，单独添加微量硼对盘条的屈服强度和抗拉强度影响不大，单独添加质量分数0.057%的钛可使盘条屈服强度和抗拉强度升高约20 MPa，同时添加质量分数为0.004 8%的硼和质量分数为0.07%的钛可使盘条屈服强度和抗拉强度显著提高，试验中，屈服强度由260升高到316 MPa，提高了56 MPa，抗拉强度由363升高到463 MPa，提高了100 MPa。同时添加硼和钛使强度提高的原因主要是由于获得了具有高位错密度的不规则的准多边形铁素体，同时细片层珠光体相变强化对该钢强度的升高也有一定贡献。

Effect of boron and titanium on microstructure and properties of low carbon Al-killed steel

The effect of boron and titanium on the microstructure and properties of low carbon Al-killed steel 08Al was studied by adding individual and both. The results show that the yield and tensile strength of 08Al had little change with adding trace (0.002 0%) boron alone,but the yield strength and tensile strength enhanced about 20 MPa with adding 0.057%Ti alone. The strength of 08Al significantly increased with adding both 0.004 8%B and 0.07%Ti,the yield strength value enhanced from 260 to 316 MPa and the tensile strength value enhanced from 363 to 463 MPa. The reason for high strength of 08Al+B+Ti steel is that quasi-polygonal ferrite with high dislocation density is obtained,at the same time,the phase transformation strengthening of fine lamellar pearlite has a certain contribution to the high strength.