Summary of - Influence of filler variation on microstructural evolution, mechanical and corrosion performance of Ti-stabilized 439 ferritic stainless steel

Document Type

Article

Abstract

In this study, gas tungsten arc welding (GTAW) was utilized to join Ti-stabilized 439 ferritic stainless steel (FSS) with different austenitic stainless steel (ASS) filler electrodes, i.e., 308L, 309L, and 316L. Optical micrographs of the weld zone (WZ) revealed the formation of retained austenite (RA) at ferrite grain boundaries (GBs) in the 308L and 309L filler electrode weldments. In contrast, various forms of austenite, such as Widmanstätten austenite (WA), grain boundary austenite (GBA), and intra-granular austenite (IGA), were observed in the WZ of the 316L filler electrode weldment. No other intermetallic phases, aside from austenite and ferrite, were detected in the WZ of all weldments. The presence and volumetric fractions of austenite and ferrite phases in the WZ of different weldments were analyzed using x-ray diffraction (XRD) and electron backscattered diffraction (EBSD) techniques. The 316L filler electrode weldment showed a higher fraction of austenite compared to the others.

Publication Date

2023

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