Characterization of super duplex stainless steel SAF2507 deposited by directed energy deposition

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F22%3A00562986" target="_blank" >RIV/68378271:_____/22:00562986 - isvavai.cz</a>

Alternative codes found

RIV/26316919:_____/22:N0000032 RIV/60461373:22310/22:43924862

Result on the web

<a href="https://doi.org/10.1016/j.msea.2022.144084" target="_blank" >https://doi.org/10.1016/j.msea.2022.144084</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2022.144084" target="_blank" >10.1016/j.msea.2022.144084</a>

Result language

angličtina

Original language name

Characterization of super duplex stainless steel SAF2507 deposited by directed energy deposition

Original language description

Super duplex stainless steel SAF2507 is characterized by good mechanical properties and corrosion resistance. However, the combination of high strength and corrosion resistance requires the balanced ratio of austenite and ferrite in microstructure. At the same time, the presence of other secondary phases such as intermetallic phases (σ, χ), carbides (M7C3, M23C6) and nitrides (π, CrN, Cr2N) is strongly undesirable. Additive manufacturing of duplex stainless steel has not been described in detail yet and the existing studies deal with the duplex stainless steels deposited by powder bed methods primarily. This study investigates the properties of steel SAF2507 prepared by the directed energy deposition (DED) method in the as-built state and after post-manufacturing solution annealing at 1100 ◦C for 60 min followed by water quenching and compares them with the duplex stainless steel additively manufactured by powder methods and conventional ways of preparation. Microstructure, phase composition and mechanical properties of both materials were studied in detail. The material after DED contains of about 28 wt% austenite, which is much more compared to additively manufactured duplex stainless steels by powder bed. The as-built state contained allotriomorphic grain boundary austenite (GBA), Widmanstatten ¨ austenite (WA) and intragranular austenite (IGA). Coarsening of austenite occurred during solution annealing, while ferrite’s grains size decreased. The solution annealed material achieves approximately the desired ratio of austenite-ferrite 50:50. Yield strength decreased slightly during solution annealing from 680 MPa to 540 MPa, whereas elongation and notch toughness increase. The ductile to brittle transition temperature (about−100 ◦C) did not change significantly during solution annealing.n

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials Science and Engineering A Structural Materials Properties Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Volume of the periodical

857

Issue of the periodical within the volume

Nov.

Country of publishing house

CH - SWITZERLAND

Number of pages

15

Pages from-to

144084

UT code for WoS article

000868699700002

EID of the result in the Scopus database

2-s2.0-85139033522