Experimental research on electromagnetic continuous casting high-speed steel composite roll
来源期刊：中南大学学报(英文版)2014年第3期
论文作者：LI Guo-jun(李国军) FENG Ming-jie(冯明杰)
文章页码：849 - 856
Key words：high speed steel composite roll; continuous casting; interface of bimetal composite; carbide
Abstract: A high speed steel composite roll billet was fabricated, which is regular in shape, smooth in surface, slight in trace, compact in internal structure, free of slag inclusion, shrinkage cavity, cracks and other flaws, and good in macro quality of junction surface using a vertical continuous casting machine. The interface zone microstructure of bimetallic in billet of high speed steel composite roll was analyzed by metallurgical microscope (OM), X-ray diffractmeter (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDS). The results indicate that the microstructure of roll billet is composed of chilled solidified layer, dendrite zone, interfacial zone of bimetal and core material zone. The microstructure of outer shell material is composed of martensite + bainite + residual austenite + some small labyrinth-shape, small-short lath-shape, or dollop-shape eutectic carbides. The microstructure of 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.
LI Guo-jun(李国军)1, FENG Ming-jie(冯明杰)2
(1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2. Key Laboratory for National Education Ministry for Electromagnetic Processing
(Northeastern University), Shenyang 110819, China)
Abstract:A high speed steel composite roll billet was fabricated, which is regular in shape, smooth in surface, slight in trace, compact in internal structure, free of slag inclusion, shrinkage cavity, cracks and other flaws, and good in macro quality of junction surface using a vertical continuous casting machine. The interface zone microstructure of bimetallic in billet of high speed steel composite roll was analyzed by metallurgical microscope (OM), X-ray diffractmeter (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDS). The results indicate that the microstructure of roll billet is composed of chilled solidified layer, dendrite zone, interfacial zone of bimetal and core material zone. The microstructure of outer shell material is composed of martensite + bainite + residual austenite + some small labyrinth-shape, small-short lath-shape, or dollop-shape eutectic carbides. The microstructure of 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.
Key words:high speed steel composite roll; continuous casting; interface of bimetal composite; carbide
