Small-angle neutron scattering study on phase separation in a super duplex stainless steel at 300?C-Comparing hot-rolled and TIG welded material

被引：8
作者：
Liu, Jianling [1 ]
Das, Yadunandan [1 ,5 ]
Babu, R. Prasath [1 ]
Wessman, Sten [2 ]
Jonsson, Jan Y. [3 ]
Odqvist, Joakim [1 ]
King, Stephen M. [4 ]
Hedstrom, Peter [1 ]
机构：
[1] KTH Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden
[2] Swerim AB, POB 7047, SE-16407 Kista, Sweden
[3] Outokumpu Stainless AB, Koppardalsvagen 71, S-77441 Avesta, Sweden
[4] STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Harwell Campus, Didcot OX11 0QX, England
[5] Open Univ, Walton Hall, Milton Keynes MK7 6AA, England
来源：
MATERIALS CHARACTERIZATION | 2022年 / 190卷
关键词：
Duplex stainless steels; TIG welding; Small-angle neutron scattering (SANS); Phase separation; Focused ion beam; digital image correlation (FIB-DIC); Residual strain; SPINODAL DECOMPOSITION; MECHANICAL-PROPERTIES; CORROSION-RESISTANCE; MICROSTRUCTURE; NANOSTRUCTURE; EMBRITTLEMENT; ALLOYS; EVOLUTION; FERRITE; NI;
D O I：
10.1016/j.matchar.2022.112044
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The evolution of nanoscale phase separation in the ferrite phase of super duplex stainless steel 25Cr-7Ni (wt%) (SDSS 2507) and two SDSS TIG (tungsten inert gas) weldments have been quantitatively investigated by smallangle 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 degrees C. These results correlate with the higher ferrite micro-hardness in the aged TIG weldments than in the SDSS 2507. The enhanced 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 strain measurements through focused ion beam and digital image correlation (FIB-DIC), indicate larger residual strains in the ferrite of weldments than in the base metal SDSS 2507. This is also believed to contribute to the enhanced phase separation.
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页数：10
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