Simulation of Microporosity in Gravity Die Cast Al-Si Foundry Alloys
A combined experimental and numerical approach to the analysis of microporosity formation in an A356 alloy cast in a step mould is presented. A model for porosity formation and growth based on microscale gas diffusion! transport in the melt, coupled with a model for feeding flows and pressures during solidification, has shown good agreement with avAllable experimentally measured porosity distributions for directionally solidified samples. In this work, the application of this modelling approach for gravity shape castings is investigated. Careful casting experiments with controlled hydrogen levels were designed and carried out. The reproducibility of these experiments was assessed by performing two experiments under identical conditions on two different days. The experimental results were compared with the predicted porosity levels. The results show good agreement between measured and simulated porosity profiles for a 0.2 mUlOO g melt hydrogen content The experimental validation carried out is essential for assisting and further development of the modelling tools.
porosity simulation hydrogen Al-Si alloys
S.Akhtar L. Amberg M. Di Sabatino D. Displnar G. Mazourkevltch J. Kappey J. Falnberg M. Schneider
Department of Materials Science and Engineering, Norwegian University of Science and Technology(NTNU SINTEF Materials and Chemistry ,Alfred Getz vei 2B,7465 Trondheim,Norway MAGMA Giessereitechnologie GmbH, Kackertstrasse 11 ,52072 Aachen, Gennany
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
562-566
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）