首道次轧制对复合钢板组织和性能的影响

利用真空轧制复合法在不同的首道次轧制压下率下对成分、状态、尺寸等相同的钢板进行了热轧复合,研究了5%,10%,15%三组不同首道次压下率真空轧制复合板的界面组织及Z向力学性能,分析了首道次压下率对复合性能的影响.实验结果表明:随着首道次压下率的增大,界面生成物尺寸逐渐变小,数量减少,形态由长条状逐渐过渡为弥散分布的细小颗粒状;在首道次压下率为15%时,复合板界面已非常洁净;复合板Z向抗拉强度、延伸率、断面收缩率及塑性都随首道次轧制压下率的增大而逐渐改善.

Effect of First Pass Rolling on Microstructure and Properties of Rolling Clad Steel Plate

Three pairs of steel plate slabs with same composition and condition were bonded together under 5%, 10% and 15% first pass rolling reduction ratios respectively by vacuum rolling clad method. The microstructures and Z-direction mechanical properties of clad plate interfaces were investigated. The results showed that the size of the interface resultants becomes smaller gradually, and the amount of the resultants decreases with the increase of the first pass rolling reduction ratios, and the shape of the resultants distributed on the interfaces transforms from long stripe-like to fine grain. While the first pass reduction ratio reaches 15%, the interface is very clean. Furthermore, the Z-direction tensile stress, the elongation, the reduction of area and the plasticity are improved gradually with the increase of the first pass reduction ratio.