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

Kód výsledku v 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>

Nalezeny alternativní kódy

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

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Materials Science and Engineering A Structural Materials Properties Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Svazek periodika

857

Číslo periodika v rámci svazku

Nov.

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

15

Strana od-do

144084

Kód UT WoS článku

000868699700002

EID výsledku v databázi Scopus

2-s2.0-85139033522