|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||Effect of Dual-phase Stabilization via Varying Ti/Nb Ratios on the Pitting Behavior of AISI 347 Welds
||Amandeep Singh Shahi, Dikshant Malhotra
|On-Site Speaker (Planned)
||Amandeep Singh Shahi
Gas tungsten arc welding process was used to fabricate different multi-pass and multi-layer weld pads comprising of combinations of AISI 347 (Nb based) and AISI 321 (Ti based) solid fillers so as to obtain different weld surfaces with varying Ti/Nb ratios. These surfaces were examined for their pitting behavior using electrochemical technique, EPMA-WDS analysis for chemical composition and XPS depth profiling of passive films. Austenitic stainless steel welds with Ti/Nb ratio of 0.29 exhibited maximum pitting potential of 380.5 mV as compared to sole Nb weld with 260.4 mV. The concentration profiles of oxygen across different weld surfaces indicate that effective passive film thickness values for sole Nb and Nb weld stabilized with Ti/Nb ratio of 0.29 were calculated to be 7.23 nm and 8.81 nm respectively. This study indicates that Ti addition upto 0.15 wt % in Nb weld can significantly enhance its pitting resistance.