Solidification and Micro Structure Simulation of Gray Cast Iron

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Farahmand Asl, Amir Hossein | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42605 (07)
University: Sharif University of Technology
Department: Material Science and Engineering
Advisor(s): Davami, Parviz
Abstract:
AS5U3G and AS7U3G are two prevalent types of alloy which are used in producing cylinder head. In this research AS5U3G alloy is studied. Gravity casting is one of the method of producing this part. Produced porosities in cylinder head casting process, cause leakage in this part. In order to solve this problem, some actions have been taken that we can divide them into quality operations improvement of melt and making changes in casts. The sampling is done in four levels to evaluate the gas porosity and shrinkage. In these levels, pressure and degassing duration and strontium's modifying in a 745℃ fixed temperature have been evaluated. Based on reports by comparing density of relative samples, it can be inferred that for AS5U3G alloy degassing via rotational degassing with Nitrogen in this temperature, the best pressure is 0.6 bar and the best duration is 8 minutes. Besides, as strontium's measure goes from 0.002 to 0.008 percent, very slight increase in the amount of porosity was observed
Keywords:
Gray Cast Iron ; Solidification Simulation ; Microstructure Simulation ; Eutectic Cells