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通过热轧试验,利用扫描电镜,TEM观察和EBSD技术等分析显微组织与力学性能之间的关系。研究结果表明:显微组织以GB+AF组织为主,AF组织呈典型的长条针状;以块状形式转变的准多边形铁素体为主,内部含有大量位错,高位错密度形成位错胞,位错线上分布着细小的析出相,具有高强度和良好冲击韧性;大角度晶界占整个分析区域内晶界的88%,大角度晶界主要分布在30°~60°,对冲击韧性非常有利。
The relationship between microstructure and mechanical properties was analyzed by hot rolling test, scanning electron microscopy, TEM observation and EBSD technique. The results showed that the microstructure was dominated by GB + AF tissue and the AF tissue was a typical long needle-like shape. The massive polygonal ferrite mainly in bulk form had a large number of dislocations and a high dislocation density Dislocations and dislocations have fine precipitates distributed on the line, with high strength and good impact toughness. The large-angle grain boundaries account for 88% of the grain boundaries in the entire analysis area, and the large-angle grain boundaries are mainly distributed in the range of 30 ° to 60 °. Very good impact toughness.