A Novel Technology of Hydrogen Measurement Based on Directional Solidification in Molten Aluminum Alloy

Jian Min Zeng; You Bin Wang; Hai Feng Cheng

doi:10.4028/www.scientific.net/MSF.704-705.1205

Paper Titles

Numerical Simulation and Experiment Study on the Blanking Force for AISI-1020 and AISI-1045 Fine-Blanking with Negative Clearance
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Effects of Shielding Gas and Magnetic Field on Characteristics of AZ31 Magnesium Alloy by TIG Welding
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Flux Jet Technique for Purification of Molten Aluminum
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Effect of Hydrogen Content on Impact Property of A357 Alloy
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A Novel Technology of Hydrogen Measurement Based on Directional Solidification in Molten Aluminum Alloy
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Antiwear Behavior of Micro-Arc Oxidated Coating Rubbing on Abrasive Paper
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Influence of Laser Parameters on Magnesium Alloy Surface Modification
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Investigation of Precipitated Hardening Layer Performance on Machined NAK80 Steel Surface
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Parameter Forecast and Parameter Optimization of High Inner-Pressure Hydro-Forming Tees Based on Genetic Algorithms and Back Propagation Algorithms
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HomeMaterials Science ForumMaterials Science Forum Vols. 704-705A Novel Technology of Hydrogen Measurement Based...

A Novel Technology of Hydrogen Measurement Based on Directional Solidification in Molten Aluminum Alloy

Abstract:

Hydrogen is a harmful element in aluminum. How to accurately measure hydrogen content in molten aluminum alloy has been significant for improving the metallurgical qualities of aluminum products. Currently, Reduced Pressure Test (RPT) based on the famous Sievert’ law is the most commonly used method to measure the hydrogen in aluminum. However, due to the changes in solidification morphology of alloys under different solidification conditions, hydrogen will be closed more or less in the sample by the developed dendrites, which results in the dispersion of test results. According to the principle of solute redistribution, an improved reduced pressure technology under directional solidification was proposed in this paper. The solidification interface was pushed on along the single direction by controlling the temperature gradient of solid-liquid interface. Hydrogen is released in front of the solid-liquid interface through the solute redistribution. The result shows that the hydrogen content increases and the mean variance decreases with the increasing of the temperature gradients. The method was proved to be of higher accuracy.