Abstract
A review of previous investigations on the mechanical properties and microstructure of niobium micro-alloyed steel weldments indicated that there is a loss of ductility after post-weld heat treatment (PWHT). This effect has been ascribed to the precipitation of finely dispersed niobium carbonitrides. However, it can be shown that such precipitation is only observable when the niobium content in the weld metal exceeds 0.025 wt%. This limit appears to be confirmed in the current work by TEM observations on samples containing 0.03 wt% niobium, annealed for various times at 625° C.
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