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Metals 2018, 8(3), 195; https://doi.org/10.3390/met8030195

Stress Corrosion Cracking Behaviour of Dissimilar Welding of AISI 310S Austenitic Stainless Steel to 2304 Duplex Stainless Steel

1
Instituto de Engenharia Mecânica, Universidade Federal de Itajuba, Av. BPS, 1303, Pinheirinho, Itajubá 37500-903, Minas Gerais, Brazil
2
Aperam South America, Praça 1º de maio, S/N, Centro, Timóteo 35180-000, Minas Gerais, Brazil
3
Departamento de Materiais (DEMA), Universidade Federal de São Carlos, Av. Washington Luis, Km 435, São Carlos 13565-905, São Paulo, Brazil
*
Author to whom correspondence should be addressed.
Received: 7 December 2017 / Revised: 1 February 2018 / Accepted: 5 February 2018 / Published: 20 March 2018
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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. View Full-Text
Keywords: dissimilar weldments; stress corrosion cracking; stainless steels dissimilar weldments; stress corrosion cracking; stainless steels
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AmaroVicente, T.; Oliveira, L.A.; Correa, E.O.; Barbosa, R.P.; Macanhan, V.B.P.; Alcântara, N.G. Stress Corrosion Cracking Behaviour of Dissimilar Welding of AISI 310S Austenitic Stainless Steel to 2304 Duplex Stainless Steel. Metals 2018, 8, 195.

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