Gadadhar Sahoo, Kilaru Ravi, Srikanthi Srikant and Pandurangan Saravanan:
Sensitization study and microstructural transformation of 12-% Cr ferritic stainless steel weldments
Ferritic steels, microstructures, HAZ, phase transformations, grain refinement
12-% chromium ferritic steel, which imparts acceptable corrosion resistance by using a low chromium content, has been explored to replace mild steel for structural components exposed to corrosive environments. However, sensitization during welding makes stainless steel vulnerable to intergranular corrosion. In this paper, the sensitization effect and microstructural transformation in heat-affected zone have been studied in single-pass welded steels. The heat-affected zone (HAZ) has been characterized by optical microscopy, elemental X-ray mapping in EPMA, microhardness measurements and double loop electrochemical potentiodynamic reactivation (DLEPR) test. Carbide precipitation is not revealed. Grain refinement in low temperature heat affected zone (LT-HAZ), and the presence of coarser grains along with unresolved martensitic blocks in high temperature heat affected zone (HT-HAZ) are explained using continuous cooling transformation (CCT) diagram and Fe-Cr phase diagram.
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