Characterization of phase properties and deformation in ferritic-austenitic duplex stainless steels by nanoindentation and finite element method

Schwarm, Samuel C.; Kolli, R. Prakash; Aydogan, Eda; Mburu, Sarah; Ankem, Sreeramamurthy

doi:10.1016/j.msea.2016.10.116

Characterization of phase properties and deformation in ferritic-austenitic duplex stainless steels by nanoindentation and finite element method

Journal Article · Thu Nov 03 00:00:00 EDT 2016 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2016.10.116· OSTI ID:1360713

Schwarm, Samuel C. ^[1]; Kolli, R. Prakash ^[1]; Aydogan, Eda ^[2]; Mburu, Sarah ^[1]; Ankem, Sreeramamurthy ^[1]

Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The phase properties and deformation behavior of the δ–ferrite and γ–austenite phases of CF–3 and CF–8 cast duplex stainless steels were characterized by nanoindentation and microstructure-based finite element method (FEM) models. We evaluated the elastic modulus of each phase and the results indicate that the mean elastic modulus of the δ–ferrite phase is greater than that of the γ–austenite phase, and the mean nanoindentation hardness values of each phase are approximately the same. Furthermore, the elastic FEM model results illustrate that greater von Mises stresses are located within the δ–ferrite phase, while greater von Mises strains are located in the γ–austenite phase in response to elastic deformation. The elastic moduli calculated by FEM agree closely with those measured by tensile testing. Finally, the plastically deformed specimens exhibit an increase in misorientation, deformed grains, and subgrain structure formation as measured by electron backscatter diffraction (EBSD).

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC52-06NA25396; NE0000724

OSTI ID:: 1360713

Alternate ID(s):: OSTI ID: 1398603

Report Number(s):: LA-UR--17-20830

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 680; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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