Study of the spinodal decomposition of an Fe-28Cr-2Mo-4Ni-Nb alloy by small-angle neutron scattering

Superferritic stainless steels become embrittled when aged in a temperature interval approx 475 deg C. This phenomenon has been studied in the alloy Fe--0.005C--28Cr--2Mo--4Ni--0.43Nb by measuring the decrease in the energy absorbed in the impact test as a function of ageing time at 475 deg C. The c...

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Bibliographic Details
Published in:Journal of materials science 1990-12, Vol.25 (12), p.4977-4980
Main Authors: ISALGUE, A, ANGLADA, M, RODRIGUEZ-CARVAJAL, J, DE GEYER, A
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
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Summary:Superferritic stainless steels become embrittled when aged in a temperature interval approx 475 deg C. This phenomenon has been studied in the alloy Fe--0.005C--28Cr--2Mo--4Ni--0.43Nb by measuring the decrease in the energy absorbed in the impact test as a function of ageing time at 475 deg C. The change which occurs in the microstructure has been studied by small-angle neutron scattering. It is shown that ageing at 475 deg C produces the decomposition of the alloy in zones rich in Cr via spinodal decomposition. The high rate of embrittlement observed compared with that which occurs in Fe--Cr binary alloys of similar Cr content, is related to a faster development of the spinodal decomposition in the steel studied. Graphs, Diffraction patterns, Photomicrographs. 16 ref.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00580116