Modeling and Simulation of Mechanical Properties of Magnesium Alloy Wheel Casting for Automobile
| Autor: | Baicheng Liu, Zhiqiang Han, Junpeng Duan, Xunming Zhu, Liang Huo, Aimin Wang |
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| Rok vydání: | 2011 |
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| Zdroj: | Supplemental Proceedings ISBN: 9781118062142 Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling, Volume 2 |
| Popis: | A mechanical property model for predicting the strength of cast magnesium alloy AZ91D has been established based on the strengthening mechanisms of the alloy such as solid solution strengthening, grain boundary effect, Orowan looping, and dispersion hardening. By using the model, the strength distribution of an automobile wheel casting was simulated, in which the thermal history data obtained by simulating the mold filling and solidification processes were adopted. Metallographical observation and tensile property test were carried out and the simulated results were compared with the experimental results for evaluating the model. Introduction Modeling and simulation have emerged as a powerful tool in optimizing casting process and predicting microstructure. However, a further step is desirable for engineers to predict the mechanical properties of a casting based on process parameters and microstructure so as to optimize the process and product design as well as reduce the developing cost and time. In this paper, the strength distribution of an AZ91D magnesium alloy wheel casting for automobile was simulated by using a mechanical property model. In the model, the strength of the magnesium alloy under as-cast, solution treated (T4) and aging (T6) conditions was calculated by combining the contribution of five strengthening mechanisms, i.e. intrinsic lattice friction, solid solution strengthening, grain boundary strengthening, Orowan looping, and dispersion hardening. The mold filling and solidification process was simulated for obtaining the thermal history of the wheel casting. The thermal history data were utilized as input of the mechanical property model, and the strength distribution of the casting was calculated, which provides a bridge to link the process and structure information with the mechanical property of the casting. Metallographical observation and tensile property test were carried out and numerical simulation was performed as a demonstration. Experimental Procedures Commercial ingots of AZ91D were cleaned, dehydrated and melted in a 500 kg electric resistance furnace, followed by purification, grain refinement, and modification. A permanent mold cooled by water at the bottom was used to produce the magnesium alloy wheel casting. The radius and height of the casting are 500 mm and 264 mm, respectively. The geometry of the casting and three typical portions (i.e. the rim, spoke, and flange) are shown in Fig. 1. Specimens |
| Databáze: | OpenAIRE |
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