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Coarsening,embrittlement and corrosion sensitization in a high temperature heat-affected zone(HTHAZ) are the major problems when 12%chromium low carbon stainless steel is being welded,which induce the deterioration of the impact toughness at a low temperature and intergranular corrosion resistance property.This study investigates the corresponding microstructures in HTHAZ with different chemical compositions and heat inputs through thermal simulation tests.The results show that the martensite content increases with the descending of ferrite factor(FF) when FF is below 9.0 and heat input influences the microstructure of high FF steel in HTHAZ.Martensite of 12%Cr stainless steel in HTHAZ with only Nb stabilization reticularly distributes at ferrite grain boundaries.
Coarsening, embrittlement and corrosion sensitization in a high temperature heat-affected zone (HTHAZ) are the major problems when 12% chromium low carbon stainless steel is being welded, which induce the deterioration of the impact toughness at a low temperature and intergranular corrosion resistance property . This study investigates the corresponding microstructures in HTHAZ with different chemical compositions and heat inputs through thermal simulation tests. The results show that the martensite content increases with the descending of ferrite factor (FF) when FF is below 9.0 and heat input influences the microstructure of high FF steel in HTHAZ. Martensite of 12% Cr stainless steel in HTHAZ with only Nb stabilization reticularly distributes at ferrite grain boundaries.