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A micro-alloyed ferritic steel strengthened by nanoscale precipitates

机译：纳米级析出物强化的微合金铁素体钢

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摘要

A ferritic steel with finely dispersed precipitates was investigated to reveal the fundamental strengthening mechanisms. The steel has a yield strength of 760 MPa, approximately three times higher than that of conventional Ti-bearing high strength hot-rolled sheet steels, and its ultimate tensile strength reaches 850 MPa with an elongation-to-failure value of 18%. Using energy dispersive X-ray spectroscopy (EDXS) and transmission electron microscope (TEM), fine carbides TiC with an average diameter of 10 nm were observed in the ferrite matrix of the 0.08%Ti steel, and some cubic M_(23)C_6 precipitates were also observed at the grain boundaries and the interior of the grains. The finely dispersed TiC precipitates in the matrix provide matrix strengthening. The estimated magnitude of precipitation strengthening is around 458 MPa, depending on the average size of the nanoscale precipitates. Dislocation densities increased from 3.42 × 10~(13) M~(-2) to 1.69 × 10~(14) m~(-2), respectively, with increasing tensile strain from 5.5% to 22%. The measured work-hardening behavior can be related to the observed dislocation accumulations resulting from the dispersed nano-scale precipitates.
机译：研究了析出物细分散的铁素体钢，以揭示基本的强化机理。该钢的屈服强度为760 MPa，约为传统含钛高强度热轧钢板的三倍，其极限抗拉强度达到850 MPa，断裂伸长率为18％。使用能量色散X射线光谱仪（EDXS）和透射电子显微镜（TEM），在0.08％Ti钢的铁素体基体中观察到平均直径为10 nm的细碳化物TiC，并且有一些立方M_（23）C_6析出物在晶界和晶粒内部也观察到。基质中细分散的TiC沉淀可增强基质。取决于纳米级沉淀物的平均尺寸，估计的沉淀强化强度约为458 MPa。位错密度从3.42×10〜（13）M〜（-2）分别增加到1.69×10〜（14）m〜（-2），拉伸应变从5.5％增加到22％。所测量的加工硬化行为可以与由分散的纳米级沉淀物引起的观察到的位错累积有关。

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