Microstructure development in a high-nickel austenitic stainless steel using EBSD during in situ tensile deformation

Journal Article · Mon Jan 15 00:00:00 EST 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2017.11.046· OSTI ID:22804866

Yvell, K., E-mail: [e-mail] ^[1]; Grehk, T.M., E-mail: [e-mail] ^[2]; Hedstrom, P., E-mail: [e-mail]; Borgenstam, A., E-mail: [e-mail] ^[3]; Engberg, G., E-mail: [e-mail] ^[1]

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1. Materials Science, Dalarna University, SE-791 88 Falun (Sweden)
2. AB Sandvik Materials Technology, SE-811 81 Sandviken (Sweden)
3. Department of Materials Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm (Sweden)

Highlights: • The number of low angle boundaries increases significantly at strains ≥ 9.5%. • Grain rotation was observed to lead to grain subdivision and even fragmentation. • Annealing twins deform due to accumulation of dislocations near their boundaries. • No deformation twins were observed and deformation took place by dislocation slip. - Abstract: Plastic deformation of surface grains has been observed by electron backscatter diffraction technique during in situ tensile testing of a high-nickel austenitic stainless steel. The evolution of low- and high-angle boundaries as well as the orientation changes within individual grains has been studied. The number of low-angle boundaries and their respective misorientation increases with increasing strain and some of them also evolve into high-angle boundaries leading to grain fragmentation. The annealing twin boundaries successively lose their integrity with increasing strain. The changes in individual grains are characterized by an increasing spread of orientations and by grains moving towards more stable orientations with <111> or <001> parallel to the tensile direction. No deformation twins were observed and deformation was assumed to be caused by dislocation slip only.

• OSTI ID: 22804866
• Journal Information: Materials Characterization, Vol. 135; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
AUSTENITIC STEELS
BACKSCATTERING
DEFORMATION
DISLOCATIONS
ELECTRON DIFFRACTION
MICROSTRUCTURE
NICKEL COMPOUNDS
PLASTICITY
SURFACES