On the relationship between laser scan strategy, texture variations and hidden nucleation sites for failure in laser powder-bed fusion

While laser powder-bed fusion has overcome some of the design constraints of conventional manufacturing meth-ods, it requires careful selection of process parameters and scan strategies to obtain favorable properties. Here we show that even simple scan strategies, complex ones being inevitable when printing intricate designs, can inadvertently produce local alterations of the microstructure and preferential grain orientation over small areas - which easily remain unnoticed across the macroscale. We describe how a combined usage of neutron imaging and electron backscatter diffraction can reveal these localized variations and explain their origin within cm-sized parts. We explain the observed contrast variations by linking the neutron images to simulated data, pole figures and EBSD, providing an invaluable reference for future studies and showing that presumably minor changes of the scan strategy can have detrimental effects on the mechanical properties. In-situ tensile tests reveal that fracture occurs in a region that was re-melted during the building process.

Marattukalam, Jithin JamesUppsala universitet,Materialfysik(Swepub:uu)jitma334 (författare)
Karlsson, DennisUppsala universitet,Oorganisk kemi(Swepub:uu)denka554 (författare)
Dessieux, LucOak Ridge Natl Lab, Oak Ridge, TN 37831 USA. (författare)
Khanh, Van TranHelmholtz-Zentrum Berlin für Materialien und Energie (HZB), Hahn-Meitner-Platz 1, 14109 Berlin, Germany (författare)
Beran, PremyslEuropean Spallat Source ERIC, Box 176, S-22100 Lund, Sweden.;Czech Acad Sci, Nucl Phys Inst, Rez 25068, Czech Republic. (författare)
Manke, IngoHelmholtz Zentrum Berlin Mat & Energie HZB, Hahn Meitner Pl 1, D-14109 Berlin, Germany. (författare)
Kardjilov, NikolayHelmholtz Zentrum Berlin Mat & Energie HZB, Hahn Meitner Pl 1, D-14109 Berlin, Germany. (författare)
Markötter, HenningHelmholtz Zentrum Berlin Mat & Energie HZB, Hahn Meitner Pl 1, D-14109 Berlin, Germany.;Bundesanstalt Mat Forsch & Prufung BAM, Unter Eichen 87, D-12205 Berlin, Germany. (författare)
Sahlberg, Martin,1981-Uppsala universitet,Oorganisk kemi(Swepub:uu)masah021 (författare)
Woracek, RobinEuropean Spallat Source ERIC, Box 176, S-22100 Lund, Sweden.;Czech Acad Sci, Nucl Phys Inst, Rez 25068, Czech Republic. (författare)
Uppsala universitetOorganisk kemi (creator_code:org_t)

Av författaren/redakt...: Pacheco, Victor; Marattukalam, Ji ...; Karlsson, Dennis; Dessieux, Luc; Khanh, Van Tran; Beran, Premysl; visa fler...; Manke, Ingo; Kardjilov, Nikol ...; Markötter, Henni ...; Sahlberg, Martin ...; Woracek, Robin; visa färre...

Om ämnet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.