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Stress relief heat treatment and mechanical properties of laser powder bed fusion built 21-6-9 stainless steel
Division of Materials Science, Luleå University of Technology, Luleå (SWE).
GKN Aerospace Sweden AB, 46181, Trollhättan (SWE).
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (KAMPT)ORCID-id: 0000-0003-3772-4371
Division of Materials Science, Luleå University of Technology, Luleå (SWE).
2023 (engelsk)Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 868, artikkel-id 144742Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this work, the effectiveness of residual stress relief annealing on a laser powder bed fusion (L-PBF) manufactured austenitic stainless steel, alloy 21-6-9 was investigated. Residual stress levels were gauged using geometrical distortion and relaxation testing results. In the investigated temperature interval (600–850 °C), shape stability was reached after subjecting the as-built material to an annealing temperature of 850 °C for 1 h. Microstructural characterization and tensile testing were also performed for each annealing temperature to evaluate the alloy’s thermal stability and the resulting tensile properties. In the as-built state, a yield strength (YS) of 640 MPa, ultimate tensile strength (UTS) of 810 MPa and 4D elongation of 47% were measured. Annealing at 850 °C for 1 h had little measurable effect on ductility (48% 4D elongation) while still having a softening effect (UTS = 775 MPa, YS = 540 MPa). From the microstructural characterization, cell-like features were observed sporadically in the annealed condition and appeared stable up until 800 °C after which gradual dissolution began, with the last remnants disappearing after subjecting the material to 900 °C for 1 h. © 2023 The Authors

sted, utgiver, år, opplag, sider
Elsevier, 2023. Vol. 868, artikkel-id 144742
Emneord [en]
Annealing; Residual stresses; Steel testing; Stress relief; Tensile strength; Annealing temperatures; Laser powder bed fusion; Laser powders; Microstructural characterizations; Powder bed; Relaxation testing; Stainless steel alloys; Stress levels; Stress relief annealing; Ultimate tensile strength; Tensile testing
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URN: urn:nbn:se:hv:diva-19822DOI: 10.1016/j.msea.2023.144742ISI: 001018900200001Scopus ID: 2-s2.0-85148068227OAI: oai:DiVA.org:hv-19822DiVA, id: diva2:1809495
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Acknowledgement for financial contributions from the RIT project (Space for Innovation and Growth), The Swedish National Space Agency (research program NRFP) and GKN Aerospace Sweden AB. The stress relaxation testing was funded by Västra Götalandsregionen, Tillväxtverket, European Regional Development Fund, and the Spacelab project (Grant number 20201639). 

Tilgjengelig fra: 2023-11-03 Laget: 2023-11-03 Sist oppdatert: 2024-01-15bibliografisk kontrollert

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