Abstract
The influence of the weld metal chemistry on the stress corrosion cracking (SCC) susceptibility of dissimilar weldments between 310S austenitic stainless steel and 2304 duplex steels was investigated by constant load tests and microstructural examination. Two filler metals (E309L and E2209) were used to produce fusion zones of different chemical compositions. The SCC results showed that the heat affected zone (HAZ) on the 2304 base metal side of the weldments was the most susceptible region to SCC for both filler metals tested. The SCC results also showed that the weldments with 2209 duplex steel filler metal presented the best SCC resistance when compared to the weldments with E309L filler metal. The lower SCC resistance of the dissimilar joint with 309L austenitic steel filler metal may be attributed to (1) the presence of brittle chi/sigma phase in the HAZ on the 2304 base metal, which produced SC cracks in this region and (2) the presence of a semi-continuous delta-ferrite network in the fusion zone which favored the nucleation and propagation of SC cracks from the fusion zone to HAZ of the 2304 stainless steel. Thus, the SC cracks from the fusion zone associated with the SC cracks of 2304 HAZ decreased considerably the time-of-fracture on this region, where the fracture occurred. Although the dissimilar weldment with E2209 filler metal also presented SC cracks in the HAZ on the 2304 side, it did not present the delta ferrite network in the fusion zone due to its chemical composition. Fractography analyses showed that the mixed fracture mode was predominant for both filler metals used.
Highlights
Austenitic stainless steel 310S is widely used for high-temperature applications in the petrochemical, nuclear, geothermal, and oil and gas industries due to its high resistance to oxidation, hydrogen embrittlement and corrosion [1,2,3].In many of these industrial applications, fusion welding is the main method used to join or repair the components and it may contribute to the particular case of corrosion denominated Corrosion StressCracking (SCC)
The following conclusions can be drawn from this study: 1
The dissimilar weldment using E309L stainless steel filler metal presented much lower resistance to stress corrosion cracking (SCC) than the dissimilar joint using 2209 duplex stainless steel. This may be attributed to the simultaneous presence of a semi-continuous delta ferrite in the 309L
Summary
Austenitic stainless steel 310S is widely used for high-temperature applications in the petrochemical, nuclear, geothermal, and oil and gas industries due to its high resistance to oxidation, hydrogen embrittlement and corrosion [1,2,3].In many of these industrial applications, fusion welding is the main method used to join or repair the components and it may contribute to the particular case of corrosion denominated Corrosion StressCracking (SCC). Austenitic stainless steel 310S is widely used for high-temperature applications in the petrochemical, nuclear, geothermal, and oil and gas industries due to its high resistance to oxidation, hydrogen embrittlement and corrosion [1,2,3]. In many of these industrial applications, fusion welding is the main method used to join or repair the components and it may contribute to the particular case of corrosion denominated Corrosion Stress. DSS, which possess good strength, high toughness and excellent resistance to SCC and localized corrosion (pitting) are more recommended in applications where the maximum working temperatures are approximately
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