Ti对高强耐候钢力学性能的影响

通过光学显微镜、透射电镜（TEM）以及力学性能测试等手段分析了薄板坯连铸连轧（TSCR）工艺生产Ti微合金化高强耐候钢的成分及工艺对显微组织和力学性能的影响．研究结果表明：钢中加入Ti，屈服强度有明显的提高；钛质量分数为0．05%～0．08%时，高强耐候钢的晶粒尺寸随着钛含量的增加基本不变；高强耐候钢强度的提高主要取决于钢中有效钛的含量，有效钛不仅与钛的含量有关。而且还与S，N的含量有关；在有效钛含量一定的条件下，析出强化的大小主要取决于轧后的卷取温度．

Effect of Ti on the mechanical properties of high strength weathering steel

Optical microscope, transmission electronic microscopy and mechanical tester were employed to analyze the effect of the composition and processing of Ti microalloyed high strength weathering steel on its microstructure and mechanical properties. The results show that Ti addition has a obvious effect on the yield strength of the experimental steel, the grain size remains unchanged as the Ti content increases in 0.05% -0.08%; the increase in strength is dependent on the content of effective titanium that is related to the contents of titanium, nitrogen and sulfur; under the certain content of effective titanium, precipitation strengthening mainly depends on the cooling rate of the experimental steel.