复合过程及热处理制度对电渣液态浇注复合轧辊界面组织的影响机理研究

本项目将紧紧围绕双金属复合轧辊制备过程中复合界面的相关科学问题进行研究。对含氟渣系界面性质、导热能力及导电能力等内容的相关研究，将揭示渣系中各种组元对渣系性能的影响规律，结合电渣液态浇注技术特点，开发电渣液态浇注专用渣系。专用渣系的应用将有利于多种不同材质复合轧辊制备过程结合界面及轧辊表面质量的控制。复合轧辊制备过程界面应力分布数值模拟的研究，将揭示多种因素对界面应力分布的影响规律，将为已抽出导电结晶器的复合轧辊的保温与加热制度提供参考依据，以保证界面的结合质量。针对所制备的复合轧辊材质特点所开展的热处理方式、热处理制度等相关研究，将揭示热处理对界面组织遗传演变规律、界面过渡特征、元素的偏聚、迁移、扩散、结合界面反应产物析出及长大影响机制。复合界面力学性能的研究将揭示界面组织对复合轧辊性能的影响规律，所有的研究工作将有利于掌握复合轧辊制备过程中获得良好结合界面的条件。

This project will focus on the scientific problems of bonding interface during the preparation of bimetallic composite roll by electroslag casting with liquid metal. Systematic study about slag interface feasure, capacity of heat transmission, conduction and other properties will be done, which will illustrate the impact of various elements in slag on slag properties. Special slag for electroslag casting with liquid metal will be developed combined with its technological characteristics. Application of slag will benefit the quality of interface and surface for composite roll of a variety of different materials. Stress model of manufacturing bimetallic composite roll using electroslag casting with liquid metal will be developed. The effect of different material, length and thickness of composite layer on the stress distribution of composite roll will be investigated, which will help us to determine the necessity of heating and heat preservation for withdrawal part during producing composite roll. In addition, heat treatment process will be investigated after high qualtiy composite roll has been produced. Impact of heat treatment on the genetic evolution mchanics of interface structure, element diffusion, element transfer, precipitation and grow regularity of reaction product, mechanical property will be illustrated. The investigation of mechanical property will illustrate the influence of interface structure on the pproperties of composite roll. All the research work in this project will benefit to master the conditions of obtaining a good bonding interface during the manufacture of composite roll.