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Advanced Mechanical Strength in Post Heat Treated SLM 2507 at Room and High Temperature Promoted by Hard/Ductile Sigma Precipitates
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Department of Ceramics, Institute of Mater. Res. of the Slovak Academy of Sciences, Košice, Slovakia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
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2019 (English)In: Metals, E-ISSN 2075-4701, Vol. 9, no 2, article id 199Article in journal (Refereed) Published
Abstract [en]

Duplex stainless steel, 71 wt.% austenite, 13 wt.% ferrite and 16 wt.% sigma, was made upon heat treating of fully ferritic as-built selective laser melted (SLM) 2507 stainless steel at 1200 °C. Formation of sigma phase in the heat treated SLM 2507 was investigated using optical microscopy and scanning electron microscopy (SEM). The heat treated SLM 2507 demonstrated a yield strength of 686 MPa, ultimate tensile strength of 920 MPa and an elongation of 1.8% at room temperature with a brittle fracture morphology. Precipitation of sigma phase during heat treatment and slow cooling improved the mechanical and wear properties at high temperatures (1200 °C and 800 °C, respectively). The tensile strength and elongation of the heat treated SLM 2507 was measured 400 MPa and 20% as compared to casted duplex steel with 19 MPa and 30% elongation at 1200 °C. The 20 times higher mechanical strength as compared to casted duplex steel was attributed to sigma precipitates. Tribological behaviour of heat treated duplex SLM 2507 containing sigma at 800 °C showed very low wear rate of 4.5 × 10−5 mm3/mN compared to casted duplex steel with 1.6 × 10−4 mm3/mN.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 9, no 2, article id 199
Keywords [en]
selective laser melting, duplex stainless steel, heat treatment, mechanical properties
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-73183DOI: 10.3390/met9020199ISI: 000460764700090Scopus ID: 2-s2.0-85062367956OAI: oai:DiVA.org:ltu-73183DiVA, id: diva2:1295923
Note

Validerad;2019;Nivå 2;2019-03-13 (johcin)

Available from: 2019-03-13 Created: 2019-03-13 Last updated: 2019-04-12Bibliographically approved

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Saeidi, KamranAlvi, SajidAkhtar, Farid

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