Finite Element Simulation Of Solid-liquid Bimetal Composite

It is widely known that wear parts have always been playing an important role in industrial field. In recent years, wear-resisting metals with excellent combination of high abrasion resistance and strength are urgent needed due to increasing demands of low-cost and high-life. Actually, a kind of material was difficult to reach such a high standard, so, the bimetal composites were arisen at the historic moment. One of the important measurements of the overall properties of composites is the quality of the interface. This paper introduces to use compounding cast processes for making a kind of bimetal composite made up of high chromium cast iron and Q235. By using ANSYS commercial package, the key issues in this process were studied, significant processes and innovative results were obtained, and these are as follows:(1) The main thermal physical parameters of high chromium cast iron and Q235were obtained based on the thermodynamics software JMatPro. Compared with the calculated parameters through empirical formula, the former includes physical parameters in the two-phase zone thermal. In this way, the precision of the simulation was improved.(2) According to the characteristic of the solid-liquid compounding cast process, reasonable finite element model was built. Numerical simulation results included temperature field cloud in different time, temperature-time curves of composites and distribution of Q235two-phase zone, etc. Though analyzing temperature field cloud of high-chromium iron and Q235, it is found that the solidification of high chromium was directional. The part near to Q235was initial solidification part. On the contrary, the last solidification part was that which was near to the sand model. Directional solidification makes cavity shrinkages concentrated in the out surface of bimetal composite, which improves the consistency of the central part of the composite metal.(3) By changing temperature, casting temperature, the liquid-solid volume ratio separately to obtain different experiment schemes. ANSYS modeling results show that all these technological parameters can improve the temperature of the interface, extend the time above solid temperature. High temperature and long time are benefit for the composition of solid-liquid surface.(4) Given the volume rates, predict temperature of Q235, casting temperature of high chromium cast iron, we researched the relationship between the compounding situation of interface and type of sand model. From the ANSYS simulation results, it can be seen that sand model thermal conductivity plays an important role in solid-liquid interface composition, furthermore, lower value is helpful to improve the quality of the interface.Through analysis of physical model, this paper built simplified finite element model of simulated bimetal compounding cast process. Simulated results show the solid-liquid bimetal compounding cast process temperature field of numerical simulation can effectively reflect the influence of casting temperature, core material predicted temperature, volume ratio and type of sand on the quality of solid-liquid interface. The research results can provide valued guidance for improving the process measures and optimizing the solid-liquid double metal compound casting technology.