异步轧制温度对SPCC/AM60/SPCC复合板组织与性能的影响

Effect of Asynchronous Rolling Temperature on Microstructure and Properties of SPCC/AM60/SPCC Composite Plate

利用异步轧制工艺制备了SPCC/AM60/SPCC(镁/钢)层状复合板材,分析了轧制温度对复合板显微组织与显微硬度的影响规律,研究了复合界面的组织形态与元素分布规律。结果表明:轧制温度320~380℃、压下率50%、异速比1.31时,可制备出板形良好的SPCC/AM60/SPCC复合板。随着轧制温度的升高,钢基体晶粒沿轧制方向伸长,并呈纤维状;而中心层镁合金发生了明显的再结晶现象,晶粒尺寸随着温度的升高而增大。轧制温度为340℃时,复合板界面、心部镁合金与钢基体的显微硬度都高于其它温度的。随着轧制温度升高,界面处Al元素含量逐渐增大,并出现富集偏聚现象,380℃时出现明显的富铝过渡带。

SPCC/AM60/SPCC(Mg/steel) laminated composite plate was prepared by asynchronous rolling process.The effect of rolling temperature on the microstructure and micro-hardness of the composite plate was analyzed,and the microstructure morphology and element distribution of the composite interface were studied.The results show that the SPCC/AM60/SPCC composite plate with good shape can be prepared when the rolling temperature is 320-380 ℃,the reduction rate is 50% and the different speed ratio is 1.31.With the increase of rolling temperature,the grain of steel matrix elongates along the rolling direction and becomes fibrous,while the recrystallization of magnesium alloy in the center layer occurs obviously,and the grain size increases with the increase of rolling temperature.When the rolling temperature is 340 ℃,the microhardness of the interface,core magnesium alloy and steel matrix of the clad plate is higher than those of other temperatures.With the increase of rolling temperature,the content of Al in the interface increases gradually,and the phenomenon of enrichment and segregation appears.At 380 ℃,there is an obvious aluminum rich transition zone.