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Effect of heat treatment above the miscibility gap on nanostructure formation due to spinodal decomposition in Fe-52.85 at.%Cr
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-3598-2465
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2018 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 145, p. 347-358Article in journal (Refereed) Published
Abstract [en]

The effect of heat treatment at temperatures above the miscibility gap (MG) on subsequent nanostructure formation due to spinodal decomposition (SD) has been investigated in an Fe-52.85 at.%Cr alloy. In-situ total neutron scattering measurements were conducted above and inside the MG to shed light on the high temperature nanostructure. Thereafter, different quenched-in nanostructures were imposed by heat treatments at various temperatures above the MG, followed by rapid quenching. The effect of the quenched-in nanostructure on subsequent SD was investigated ex-situ by small-angle neutron scattering, analytical transmission electron microscopy and hardness testing. The critical temperature of the miscibility gap was found at ∼580 °C for the Fe-52.85 at.%Cr alloy and below that temperature, phase separation occurs, where the ferrite decomposes into Fe-rich α-phase and Cr-rich α′-phase. It was found that transient clustering of Cr occurs above the MG and that the tendency of clustering increases with decreasing temperature. The quenched-in clustering present in rapidly quenched materials treated above the MG has a significant effect on the kinetics of SD upon further aging within the MG. It is clear that the significant quenched-in Cr clustering present in samples heat treated at 600 and 700 °C accelerates SD. However, samples heat treated at 1000 °C demonstrate more rapid SD kinetics than samples heat treated at 800 °C. Cr clustering and other mechanisms affecting the kinetics of SD are discussed in the light of the results obtained. 

Place, publisher, year, edition, pages
Acta Materialia Inc , 2018. Vol. 145, p. 347-358
Keywords [en]
Clustering, Small-angle neutron scattering (SANS), Spinodal decomposition, Stainless steel, Total neutron scattering, Chromium alloys, Heat treatment, High resolution transmission electron microscopy, Kinetics, Nanostructures, Neutron scattering, Phase separation, Solubility, Temperature, Transmission electron microscopy, Analytical transmission electron microscopy, Critical temperatures, Effect of heat treatments, High temperature, Miscibility gap, Nanostructure formation
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223139DOI: 10.1016/j.actamat.2017.12.008ISI: 000424726200035Scopus ID: 2-s2.0-85039736015OAI: oai:DiVA.org:kth-223139DiVA, id: diva2:1193203
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VINNOVA
Note

 QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-26Bibliographically approved

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Odqvist, JoakimHedström, Peter

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