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在不同的总压下率下,对两块尺寸和成分状态相同的连铸坯进行真空轧制复合,以得到特厚复合钢板。分析了总压下率对复合板的界面组织和Z向力学性能的影响。结果表明,在总压下率10%下,复合板界面存在条状缺陷,利用原位观察法和能谱分析证实该缺陷由Al-Si-Mn氧化物和孔隙组成。当总压下率超过30%后,缺陷中孔隙消失,氧化物逐渐被细化,当总压下率达到70%,界面氧化物几乎消失。随着总压下率的增加,复合板的Z向抗拉强度和伸长率均显著增加。总压下率为10%时,复合板断裂在界面且为脆性断裂,伸长率很低;总压下率70%时,复合板断裂在母材且为韧性断裂,伸长率和Z向抗拉强度最高。
At different total reduction rates, two slabs of the same size and composition were vacuum rolled and compounded to obtain a very thick composite steel plate. The effect of total reduction rate on the interfacial microstructure and Z-direction mechanical properties of the composite plate was analyzed. The results show that strip defects exist at the interface of composite plate under the total reduction of 10%. The in-situ observation and energy spectrum analysis show that the defects consist of Al-Si-Mn oxides and pores. When the total reduction rate exceeds 30%, the defects disappear, and the oxide is gradually refined. When the total reduction reaches 70%, the interface oxide almost disappears. With the increase of the total reduction rate, the Z-direction tensile strength and elongation of the composite board increased significantly. When the total reduction rate is 10%, the composite plate breaks at the interface and is brittle fracture, the elongation is very low. When the total reduction rate is 70%, the composite plate breaks at the base metal and is ductile fracture, elongation and Z-direction The highest tensile strength.