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利用金相显微镜和电子显微镜等方法对微Ｔｉ低碳钢板的微观组织和第二相粒子的沉淀行为进行了研究。结果表明，基体组织由极细晶铁素体和亚晶粒组成，铁素体晶粒平均尺寸为４．８７μｍ。细小的第二相粒子在铁素体中沉淀析出，粒子的平均尺寸为１２．４ｎｍ，沉淀的粒子体积百分数为０．０３６％。在亚晶界上观察到大粒子的沉淀，位错被细小呈球形的粒子所钉扎．相分析表明，这些粒子为ＴｉＮ，Ｔｉ（Ｃ、Ｎ）或ＴｉＣ．经计算，沉淀强化与细晶强化值分别为４０ＭＰａ和２４０ＭＰａ。
The microstructure and the precipitation behavior of the second-phase particles of micro-Ti low-carbon steel sheets were studied by metallographic microscope and electron microscope. The results show that the matrix consists of very fine ferrite and subgrains, and the average ferrite grain size is 4.87μm. Fine second phase particles precipitated in the ferrite, with an average particle size of 12.4 nm and a precipitated particle volume fraction of 0.036%. Precipitation of large particles is observed on the subgrain boundaries, and dislocations are pinned by finely spherical particles. Phase analysis shows that these particles are TiN, Ti (C, N) or TiC. After calculation, precipitation strengthening and fine grain strengthening values were 40MPa and 240MPa.