电磁连续铸造法制备高速钢复合轧辊

进行了高速钢复合轧辊的电磁连续铸造实验,在工艺参数匹配得当的情况下,制备出了外观形状规整、振痕轻微,内部组织致密,结合面质量良好的辊坯。分析结果表明,辊坯从外到内依次为激冷凝固层、枝状晶区、界面结合区和辊芯金属区。外层高速钢主要是马氏体+贝氏体+残余奥氏体+合金碳化物组织,其中的共晶碳化物呈迷宫状、短条状和粒状,辊芯为珠光体+沿晶界析出的少量铁素体,晶粒细小。双金属复合界面的结构主要由扩散层、激冷凝固层和柱状晶区组成。

High Speed Steel Composite Roll Manufactured by Electromagnetism Continuous Casting

A high speed steel composite roll billet which has not only favorable interface quality of outer shell and core material and regular outer shape, but also shallow oscillation marks and compact microstructure was manufactured by electromagnetism continuous casting for cladding method. When the relations of the technique parameters are proper. The results indicate that the microstructure of the roll billet is composed of chilled solidified layer, dendrite zone, interfacial zone of bimetal and core material zone. The microstructures of the outer shell material include martensite, bainite, residual austenite and some small labyrinth-shape, small-short lath-shape, or dollop-shape eutectic carbides. The microstructure of the core material is slice-shape pearlite and a little ferrite along boundary of cells. The interface region microstructure of bimetallic composite roll consists of diffusion region, chilled solidified layer and columnar grain region