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Effect of microcontent Nb in solution on the strength of low carbon steels

机译：溶液中微量Nb对低碳钢强度的影响

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摘要

Two low carbon steels were hot rolled by thermo-mechanical process (TMCP), and one contains niobium (0.013%), and another does not contain niobium. By the comparison of tested results, it can be found that the yield strength of Nb steel is 55 MPa higher than that of Nb free steel on an average. In addition, the ferrite grain of Nb steel is finer than that of Nb free steel under the same finishing temperature, cooling rate, and final temperature. However, there are no Nb(C,N) particles to precipitate from austenite and ferrite by the observation of transmission electron microscopy (TEM). It can be concluded by theoretical analysis that both the increase of strength and the refinement of ferrite grain of Nb steel result from solid solution Nb atoms.
机译：两种低碳钢通过热机械工艺（TMCP）进行热轧，一种含铌（0.013％），另一种不含铌。通过比较试验结果，可以发现Nb钢的屈服强度平均比不含Nb的钢高55MPa。此外，在相同的终轧温度，冷却速度和最终温度下，Nb钢的铁素体晶粒比不含Nb的钢更细。然而，通过透射电子显微镜（TEM）的观察，没有Nb（C，N）颗粒从奥氏体和铁素体中沉淀出来。通过理论分析可以得出结论，固溶Nb原子既提高了强度又提高了Nb钢的铁素体晶粒细化。

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