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对Q225钢在再结晶区进行终轧并进行不同温度的加热后空冷,利用光学显微镜观察其微观组织形貌,利用透射电子显微镜及能谱仪分析析出相的数量、形态、大小、分布及成分,利用扫描电镜的EBSD技术研究了试样的织构取、向差角分布以及真实晶粒度的测量。结果表明:随着加热温度的升高,晶粒有长大的趋势,但晶粒尺寸相差不是很大。随着加热温度的升高,亚晶界不断吸收位错,亚晶数量不断减少,晶粒之间的取向差呈大角度关系所占的比例有所增多。试样热轧织构主要是{001}<110>,随着加热温度的升高,织构强度会变得越来越弱。试样中析出相主要是圆形和方形粒子,它们是TiC,TiN和Ti(C,N),且细小、弥散分布。
Q225 steel was cold-rolled in the recrystallization zone and air-cooled at different temperatures. The microstructure of Q225 steel was observed by light microscopy. The number, morphology, size, distribution and composition of precipitated phases were analyzed by transmission electron microscopy and energy dispersive spectroscopy , The use of scanning electron microscopy EBSD technology to test the texture taken to the difference angle distribution and the real grain size measurement. The results show that with the increase of heating temperature, the grains have the tendency to grow up, but the grain size difference is not very big. As the heating temperature increases, the subgrain boundaries continue to absorb dislocations, the number of subgrains decreases, and the difference in orientation between the grains increases in a wide angle relationship. The hot-rolled texture of the sample is mainly {001} <110>. As the heating temperature increases, the texture strength becomes weaker and weaker. The precipitates in the sample are mainly round and square particles, which are TiC, TiN and Ti (C, N) and are fine and disperse.