Precipitation strengthening in titanium microalloyed high-strength steel plates with new generation-thermomechanical controlled processing (NG-TMCP)
Precipitation strengthening in titanium microalloyed high-strength steel plates with new generation-thermomechanical controlled processing (NG-TMCP)
复制标题
新一代热机械控制处理（NG-TMCP）钛微合金化高强度钢板的沉淀强化
DOI：
10.1016/j.jallcom.2016.08.010
复制
发表时间：
2016-12-25
影响因子：
6.2
通讯作者：
Misra, R. D. K.
中科院分区：
文献类型：
--
作者：
Li, X. -L.;Lei, C. -S.;Misra, R. D. K.
我们在这里阐明钛微合金化的低碳钢，这是轧制成12 mm厚的板，使用热机械控制加工（TMCP）和超快冷却（UFC）的组合的强化机制。超快冷却与形变热控工艺相结合被我们称为新一代（NG）-TMCP。采用化学物相分析、小角X射线散射（SAXS）和高分辨透射电子显微镜（TEM）研究了纳米晶析出相和微合金化析出相的特征。在Ti微合金化钢中，除纳米级TiC外，还观察到体积分数较高的尺寸小于35 nm的铁素体析出相。高体积分数渗碳体比纳米TiC具有更强的沉淀强化作用。结合固溶强化和晶粒细化强化的贡献，估算了不同类型和尺寸的纳米级析出相的沉淀强化贡献。屈服强度的估算值与实验值一致。(C)2016爱思唯尔B. V.保留所有权利。
We elucidate here the strengthening mechanisms in titanium microalloyed low-carbon steels, which were rolled into plates of 12 mm thickness using a combination of thermomechanical controlled processing (TMCP) and ultrafast cooling (UFC). The ultrafast cooling combined with thermomechanical controlled processing is referred by us as new generation (NG)-TMCP. Chemical phase analysis, small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (TEM) were used to study the characteristics of nanoscale cementite precipitates and microalloyed precipitates. Besides nanoscale TiC, cementite precipitates of size less than similar to 35 nm with high volume fraction were observed in Ti-microalloyed steel. Cementite with high volume fraction had a stronger precipitation strengthening effect than nanometer-sized TiC. The precipitation strengthening contribution of nanoscale precipitates of different types and size was estimated together with solid solution strengthening and grain refinement strengthening contribution. The estimated yield strength was consistent with the experimental value. (C) 2016 Elsevier B.V. All rights reserved.