图为20mm Q690NHH 回火态扫描组织,可以看出,回火后,钢板组织为粒状贝氏体+ M-A岛组织,随着回火温度的升高,组织粗化。
The picture shows the scanning structure of the tempered state of 20mm Q690NHH. It can be seen that after tempering, the structure of the steel plate is granular bainite + M-A island structure. As the tempering temperature increases, the structure becomes coarser.