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Strainageing 2

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schrijen

Materials
May 19, 2005
10
NL
Does anyone know what the aluminium-nitrogen ratio must be for preventing strain-ageing in carbon steel and how to measure this in the field.
 
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I have seen several technical papers on this subject where strain aging in carbon and low alloy steel can be significantly reduced by maintaining an approximate 3:1 ratio of AL:N. If the nitrogen content of the steel is inadvertently increased during steel production, this results in the formation of Fe4N (iron nitride) that will precipitate between 300 to 600 deg F, and tie up slip systems. This increases strength and reduces ductility in the steel.

Since you need to measure the aluminum and nitrogen contents of the steel, the only reliable method is to remove a sample and perform a chemical analysis.
 
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