Technology and Challenges in Additive Manufacturing of Duplex Stainless Steels

Duplex stainless steels (DSS) comprise equivalent proportions of ferrite (α) and austenite (γ) and exhibit excellent integration of mechanical and corrosion properties. The ferrite matrix provides better strength and stress corrosion resistance, whereas the austenite matrix accounts for good pitting corrosion resistance and toughness. Duplex stainless steels are widely utilized in the chemical industry, oil refineries, and machine industries. Direct energy deposition (DED) and powder bed fusion (PBF) are the two additive manufacturing techniques widely used for metals. This article covers the technologies like processing DSS by selective laser melting (SLM), variation in mechanical and microstructural properties of duplex stainless steels manufactured by additive manufacturing technique, and challenges of additive manufacturing processes.

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Sintered Duplex Stainless Steels Corrosion Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.721 ◽

2007 ◽

Vol 534-536 ◽

pp. 721-724 ◽

Cited By ~ 1

Author(s):

Leszek Adam Dobrzański ◽

Z. Brytan ◽

Marco Actis Grande ◽

Mario Rosso

Keyword(s):

Mechanical Properties ◽

Corrosion Resistance ◽

Chemical Composition ◽

Stainless Steels ◽

Duplex Stainless Steels ◽

Vacuum Furnace ◽

X Rays ◽

Aisi 316L ◽

Corrosion Properties ◽

Mechanical Properties And Corrosion

This work presents mechanical properties and corrosion resistance of duplex stainless steels obtained through powder metallurgy starting from austenitic X2CrNiMo17-12-2 (AISI 316L), martensitic X6Cr13 (AISI 410L) powders by controlled addition of alloying elements in the proper quantity to obtain the chemical composition of the structure similar to biphasic one. In the mixes preparations the Schaffler’s diagram was taken into consideration. Prepared mixes of powders have been sintered in a vacuum furnace with argon backfilling. After sintering rapid cooling was applied using nitrogen. Produced duplex stainless steels have been studied by SEM with EDS and light optical microscopy (LOM) and X-rays analysis to determine obtained structures. Corrosion properties have been studied through electrochemical methods in 1M NaCl.

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Corrosion Resistance of New Duplex Stainless Steels in Coke Production

Coke and Chemistry ◽

10.3103/s1068364x20020064 ◽

2020 ◽

Vol 63 (2) ◽

pp. 88-96

Author(s):

S. V. Nesterenko

Keyword(s):

Corrosion Resistance ◽

Stainless Steels ◽

Coke Production ◽

Duplex Stainless Steels

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CARPENTER 7-Mo PLUS

Alloy Digest ◽

10.31399/asm.ad.ss0608 ◽

1995 ◽

Vol 44 (9) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Physical Properties ◽

Stress Corrosion Cracking ◽

Stainless Steels ◽

Heat Exchangers ◽

Heat Treating ◽

Ferrite Matrix ◽

Corrosion Pitting ◽

Petrochemical Industries

Abstract CARPENTER 7-Mo PLUS is a duplex stainless steel of austenite in a ferrite matrix. It is superior to 300 series stainless steels like types 304 and 316 in strength, corrosion, pitting and stress-corrosion cracking resistance (to chlorides). Typical applications are heat exchangers in the chemical and petrochemical industries. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-608. Producer or source: Carpenter.

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