材料期刊网

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。

Under various total rolling reduction ratios, two same continuous casting slabs were subjected to vacuum rolling cladding to examine of possibility of achieving the heavy gauge clad steel plate with a high quality. The microstructure and mechanical properties of clad plate were mainly investigated. At a total rolling reduction ratio of 10%, some obvious like-strip defects, which existed in the interface of the clad plate, consisted of the interstice and Al-Si-Mn oxide indicating by in situ observation method and energy dispersive spectroscopy. At a total rolling reduction ratio (≥30%), the interstice at the interface vanishes. Enhancement of the total rolling reduction ratio results in decreasing of the oxide size. Furthermore, with enhancing total rolling reduction ratio, Z direction tensile strength and elongation increased significantly. While at a total reduction ratio of 10%, the brittle fracture appeared at the interface, at a total reduction ratio of 70%, the ductile fracture occurred in the parent material.