Load partitioning between single bulk grains in a two-phase duplex stainless steel during tensile loading

• Published in: Acta materialia 2010, Vol.58 (2), p.734-744
• Main Authors: Hedström, Peter, Han, Tong-Seok, Lienert, Ulrich, Almer, Jonathan, Odén, Magnus
• Format: Article
• Language: English
• Subjects: Applied sciences; AUSTENITE; Chemical engineering; DEFORMATION; Engineering Materials; Exact sciences and technology; FERRITE; Finite-element modeling (FEM); Kemiteknik; MATERIALS SCIENCE; Materialteknik; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik; Metals. Metallurgy; SIMULATION; Single-grain strain; STAINLESS STEELS; STRAINS; Synchrotron radiation; TECHNOLOGY; TEKNIKVETENSKAP; Teknisk materialvetenskap; X-RAY DIFFRACTION
• ISSN: 1359-6454; 1873-2453; 1873-2453
• DOI: 10.1016/j.actamat.2009.09.053

The lattice strain tensor evolution for single bulk grains of austenite and ferrite in a duplex stainless steel during tensile loading to 0.02 applied strain has been investigated using in situ high-energy X-ray measurements and finite-element modeling. Single-grain X-ray diffraction lattice strain data for the eight austenite and seven ferrite grains measured show a large variation of residual lattice strains, which evolves upon deformation to the point where some grains with comparable crystallographic orientations have lattice strains different by 1.5 × 10 −3, corresponding to a stress of ∼300 MPa. The finite-element simulations of the 15 measured grains in three different spatial arrangements confirmed the complex deformation constraint and importance of local grain environment.