Texture evolution in selective laser melted maraging stainless steel CX with martensitic transformation
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Texture evolution in selective laser melted maraging stainless steel CX with martensitic transformation Hadi Pirgazi1,2,*, Mehdi Sanjari3,4, Saeed Tamimi5, Babak Shalchi Amirkhiz3,4, Leo A. I. Kestens1,2, and Mohsen Mohammadi3 1
Department of Electromechanical, Systems and Metal Engineering, Ghent University, Ghent, Belgium Department of Materials Science and Engineering, Delft University of Technology, Delft, The Netherlands 3 Marine Additive Manufacturing Centre of Excellence (MAMCE), University of New Brunswick, Fredericton, NB, Canada 4 CanmetMATERIALS, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, Canada 5 Advanced Forming Research Centre (AFRC), University of Strathclyde, Glasgow, UK 2
Received: 18 May 2020
ABSTRACT
Accepted: 27 August 2020
Due to high local cooling rates and non-equilibrium directional solidification conditions, selective laser melting (SLM) processed metals exhibit microstructural and textural features significantly different from the conventionally processed ones. The evolution of crystallographic orientations in a maraging stainless steel (commercially known as stainless steel CX) sample fabricated by the SLM process was studied through experimental and modelling approaches Electron backscattering diffraction analysis showed that the dominant texture components in martensite and austenite phases are \111[|| building direction and \011[|| building direction, respectively. Texture simulation indicated that the formation of crystallographic orientations in the studied sample is the result of two consecutive phase transformations, from initially solidified delta ferrite phase with dominant cube fiber texture to austenite and austenite to martensite.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction Selective laser melting (SLM) is a commonly employed laser powder-bed fusion-based additive manufacturing (AM) technique for fabricating metal components from feedstock powder [1]. SLM uses a computer controlled high energy laser as the heat source, which layer by layer melts and fuses selective regions of the metallic powder and produces fully Handling Editor: Sophie Primig.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05290-2
dense near net-shape components. The main focus of most of the related research activities on SLM and other AM processes has been on the feasibility of the process for manufacturing flawless components, the resulting mechanical properties, and some limited microstructural characterizations [2–5]. AM processes have not yet entered the market as a mature and fully adopted technology. One of the open processing questions that requires further
J Mater Sci
investigation pertains to the evolution of crystallographic texture during the SLM process. Deep understanding of the evolved texture is of crucial importance because: (1) many of the material properties are texture dependent [6–10]; and (2) the crystallographic texture influences different phenomena such as r
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