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Phase Separation in Super Duplex Stainless Steel at 300 °C - Comparing Hot-Rolled Base Material and Tig Welds

Year: 2022
Type: article
Abstract: The evolution of nanoscale phase separation in the ferrite phase has been quantitatively investigated in super duplex stainless steel 25Cr-7Ni (wt.%) (SDSS 2507) and two SDSS TIG (tungsten inert gas) weldments by small-angle neutron scattering (SANS). The results show that the phase separation is more pronounced in the SDSS weldments in comparison to the base metal SDSS 2507, especially after aging for 35 000 h at 300 °C. These results correlate with the higher ferrite micro-hardness in the aged TIG weldments than SDSS 2507. The accelerated kinetics of phase separation is partly due to the higher contents of Cr and Ni in the ferrite of TIG weldments compared to SDSS 2507 base metal, revealed by energy-dispersive X-ray spectroscopy (EDS). Additionally, the residual stress measurements through focused ion beam and digital image correlation (FIB-DIC), showed greater residual stresses in the ferrite for weldments than for the base metal SDSS 2507. This is also believed to contribute to the accelerated rate of phase separation.
DOI: 10.1016/j.matchar.2022.112044
Authors: Jianling Liu, Yadunandan Das, R. Prasath Babu, Sten Wessman, Jan Y. Jonsson, Joakim Odqvist, Stephen M. King, Peter Hedström
Institutions: KTH Royal Institute of Technology, Swerim, Outokumpu (Sweden), Rutherford Appleton Laboratory, Science and Technology Facilities Council, ISIS Neutron and Muon Source
Language: English
Open Access status: hybrid
Estimated APC paid: $3,240
Funders: National Science Foundation, European Commission, Jernkontoret, China Scholarship Council, Science and Technology Facilities Council, Division of Materials Research
Awards: G1440776884, G1689194922, G1867309824, G3108985476, G4310665315, G434337789, G5214689270, G5463057615, World class Science and Innovation with Neutrons in Europe 2020 – SINE2020, G6271517897, IMR-MIP DANSE - Distributed Data Analysis for Neutron Scattering Experiments - CNST, G8380713174
OpenAlex ID: W4281620187
FWCI: 0.947
Cites: 41
Cited by: 12
Related to: 10