The microstructure and mechanical properties of a single-bead ferritic weld metal were studied in the as-welded and artificially strain-aged condition. It was found that the phenomena by which artificial strain aging increases hardness and strength, but decreases toughness, are caused by an increased dislocation density and the formation of precipitates at dislocations within the ferrite grains. These differences on a submicrometre scale are responsible for the observed changes in mechanical properties upon strain aging the ferritic weld metal.
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