Additive Manufacturing with Superduplex Stainless Steel Wire by CMT Process

For many years, the oil and gas industry has utilized superduplex stainless steels due to their high strength and excellent corrosion resistance. Wire arc additive manufacturing (WAAM) was used with superduplex filler wire to create walls with different heat input. Due to the multiple heating and co...

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Bibliographic Details
Published in:Metals (Basel ) 2020-02, Vol.10 (2), p.272
Main Authors: Lervåg, Malin, Sørensen, Camilla, Robertstad, Andreas, Brønstad, Bård M., Nyhus, Bård, Eriksson, Magnus, Aune, Ragnhild, Ren, Xiaobo, Akselsen, Odd M., Bunaziv, Ivan
Format: Article
Language:English
Subjects:
mechanical properties
microstructure
stainless steel
toughness
wire arc additive manufacturing (waam)
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Summary:For many years, the oil and gas industry has utilized superduplex stainless steels due to their high strength and excellent corrosion resistance. Wire arc additive manufacturing (WAAM) was used with superduplex filler wire to create walls with different heat input. Due to the multiple heating and cooling cycles during layer deposition, brittle secondary phases may form such as intermetallic sigma (σ) phase. By inspecting deposited walls within wide range of heat inputs (0.40–0.87 kJ/mm), no intermetallic phases formed due to low inter-pass temperatures used, together with the high Ni content in the applied wire. Lower mechanical properties were observed with high heat inputs due to low ferrite volume fraction, precipitation of Cr nitrides and formation of secondary austenite. The walls showed good toughness values based on both Charpy V-notch and CTOD (crack tip opening displacement) testing.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10020272