Systematic study of formation of soft and hard zones in the dissimilar weldments of Cr–Mo steels

The microstructural stability and elemental redistribution in dissimilar weldments between 9Cr–1Mo and 2.25Cr–1Mo ferritic steels during various postweld heat treatments (PWHTs) have been studied using microscopy techniques ranging from optical to transmission electron microscopy and electron probe microanalyser. Application of PWHT at 1023 K for various times resulted in the formation of a soft zone in the low Cr side and a carbide rich hard...