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试制了屈服强度超过700MPa,抗拉强度超过800MPa,-40℃冲击功大于120J且Pcm(焊接裂纹敏感性指数)小于0.20的高强度厚板。研究了厚板制备过程的轧制和回火温度等参数。结果表明:厚板的微观组织为贝氏体铁素体和M/A组元;随回火温度从580℃升高到630℃,贝氏体铁素体片层界面逐渐退化,M/A组元逐渐消失。
High-strength slabs with a yield strength of more than 700 MPa, a tensile strength of more than 800 MPa, an impact energy of -40 ° C. of more than 120 J and a Pcm (weld crack sensitivity index) of less than 0.20 were tried and produced. The parameters of the rolling and tempering temperature in the process of slab preparation were studied. The results show that the microstructure of bainitic plate is bainitic ferrite and M / A. With the increase of tempering temperature from 580 ℃ to 630 ℃, the interface of bainitic ferrite sheet gradually degenerates, and the microstructure of M / A Components disappear.