Study on welding thermal cycle and residual stress of UNS S32304 duplex stainless steel selected as external shield for a transport packaging of Mo-99

Evandro Giuseppe Betini; Maurilio Pereira Gomes; Mariana Xavier Milagre; Caruline de Souza Carvalho Machado; Luis Augusto Mendes dos Reis; Cristiano S Mucsi; Marcos Tadeu D'Azeredo Orlando; Temistocles Souza Luz; Luis Gallego Martinez; Jesualdo Luiz Rossi

doi:10.15392/bjrs.v7i2A.679

Authors

Evandro Giuseppe Betini INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO
Maurilio Pereira Gomes INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO
Mariana Xavier Milagre INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO
Caruline de Souza Carvalho Machado INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO
Luis Augusto Mendes dos Reis INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO
Cristiano S Mucsi INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO
Marcos Tadeu D'Azeredo Orlando DEPARTAMENTO DE FÍSICA/UNIVERSIDADE FEDERAL DO ESPIRITO SANTO
Temistocles Souza Luz DEPARTAMENTO DE ENGENHARIA MECÂNICA/UNIVERSIDADE FEDERAL DO ESPIRITO SANTO
Luis Gallego Martinez INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO
Jesualdo Luiz Rossi INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES/UNIVERSIDADE DE SÃO PAULO

DOI:

https://doi.org/10.15392/bjrs.v7i2A.679

Keywords:

thermal cycle, residual stress, duplex stainless steel, welding, Mo-99, radioactive material

Abstract

Thin plates of duplex stainless steel UNS S32304 were welded using the pulsed gas tungsten arc GTAW process (butt joint) without filler addition. The used shielding gas was pure argon and 98% argon plus 2% of nitrogen. The thermal cycles were acquired during welding, in regions near the melting pool. This alloy is candidate for the external clad of a cask for the transport of high activity radiopharmaceuticals substances. For the residual stress measurements in austenite phase an X-ray diffractometer was used in a Bragg-Brentano geometry with CuKα radiation (λ= 0.154 nm) and for ferrite phase was used a pseudo-parallel geometry with CrKα radiation (λ= 0.2291nm). The results of residual stress using sin²y methodology shown that the influence of the high welding temperature leads to compressive stresses for both phase of the duplex steels mainly in heat-affected zone. It was observed a high temperature peak and an increase of the mean residual stress after addition of nitrogen to the argon shielding gas.

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