Simulation Fluidity Test for Semisolid Squeeze Casting

Richard Pastirčák,Denis Martinec,R Lenhard,K Kaduchová

doi:10.1051/matecconf/202032802006

Abstract

The paper deals with semi solid squeeze casting technology. Fluidity tests were designed for the selected technology. The shape of the test casting was designed in the shape of test bars with different thicknesses and also in the shape of a stepped casting. The thickness of the individual elements was chosen on the basis of a selected / preferred numbers R10 EN STN 17. As a result, the thickness of the elements was 2.0, 2.5, 3.15, 4.0, 5.0 and 6.3 mm. Designed fluidity tests were verified by using ProCast simulation software. The selected process parameters were: operating pressure 80 MPa, mold temperature 200 °C, piston speed 30 mm.s-1. The experimental material was an AlSi7Mg0.3 alloy with a different solid phase content. The initial solid amount were 50, 55 and 60 %. The effect of solidus and liquidus, temperature distribution and pressure was monitored during the evaluation of fluidity.

Highlights

Semi-solid metal processing technologies use the thixotropic behavior of metallic materials
We have proposed a fluidity test, which will evaluate, in addition to the length of the filled element, the increase in mechanical properties, especially the ductility of the casting material [4, 8]
Fig. 5.5HVXOWVRIWKHQXPHULFDOVLPXODWLRQDQGWKHH[SHULPHQWDOFDVWLQJ By changing the process parameters, it is possible to achieve better filling of the element, but the pressure distribution in the semi-solid state is complicated, what can be observed on experimental casting

Summary

Introduction

Semi-solid metal processing technologies use the thixotropic behavior of metallic materials. The thixotropic behavior is manifested only in the initial material with a non-dendritic structure. Methodologies for achieving the necessary non-dendritic structures are key to the successful commercialization of these processes [1, 2, 3]. The resistance affect the flow itself, and the pressure distribution in the individual sections of the casting, which results in different mechanical properties in the cross sections of the casting. For these reasons, it is important for the research of SSSC technology to know the foundry properties of the material, especially the fluidity. Fluidity is one of the most important foundry properties, which determines the limits of the technology used [4, 5, 6]

Methods

Results

Conclusion