Novel Mechanical Characterization of Austenite and Ferrite Phases within Duplex Stainless Steel
Hossein Besharatloo,
Marcel Carpio,
José-María Cabrera,
Antonio Manuel Mateo,
Gemma Fargas,
Jeffrey Martin Wheeler,
Joan Josep Roa,
Luis Llanes
Affiliations
Hossein Besharatloo
CIEFMA(Centro de Integridad Estructural, Fiabilidad y Micromecánica de los Materiales)-Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya-BarcelonaTech, 08019 Barcelona, Spain
Marcel Carpio
PROCOMAME—Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya-BarcelonaTech, 08019 Barcelona, Spain
José-María Cabrera
PROCOMAME—Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya-BarcelonaTech, 08019 Barcelona, Spain
Antonio Manuel Mateo
CIEFMA(Centro de Integridad Estructural, Fiabilidad y Micromecánica de los Materiales)-Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya-BarcelonaTech, 08019 Barcelona, Spain
Gemma Fargas
CIEFMA(Centro de Integridad Estructural, Fiabilidad y Micromecánica de los Materiales)-Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya-BarcelonaTech, 08019 Barcelona, Spain
Jeffrey Martin Wheeler
Laboratory for Mechanics of Materials and Nanostructures, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland
Joan Josep Roa
CIEFMA(Centro de Integridad Estructural, Fiabilidad y Micromecánica de los Materiales)-Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya-BarcelonaTech, 08019 Barcelona, Spain
Luis Llanes
CIEFMA(Centro de Integridad Estructural, Fiabilidad y Micromecánica de los Materiales)-Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya-BarcelonaTech, 08019 Barcelona, Spain
The microstructure and micromechanical properties of the constitutive phases of a particular duplex stainless steel in various processing conditions have been characterized. Hardness (H), elastic modulus (E) and H/E cartography maps were obtained by using a high-speed nanoindentation mapping technique. Small-scale H and E evolution at different processing conditions has been investigated by statistical analysis of a large number of nanoindentations (10,000 imprints per sample). Two mechanically distinct phases, ferrite (α) and austenite (γ), were deconvoluted from this dataset using Ulm and Constantinides’ method, with the remaining values assigned to a third mechanical phase linked to composite-like (containing α/γ interphase boundaries) regions. These mechanical property phase assessments were supplemented by overlaying crystallographic phase maps obtained by electron backscattered diffraction. An excellent correlation between microstructure and small-scale mechanical properties was achieved, especially when considering the ratio H/E.
