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Coarsening of cementite during tempering of a martensitic steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0003-4825-7430
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0003-1102-4342
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0003-3598-2465
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Coarsening of cementite (M3C) in a martensitic steel alloy Fe–1C–1Cr (wt. %) during tempering at 700 °C was investigated by electron microscopy and kinetic modelling. It is shown that the large M3C carbides are mostly located at high-angle grain boundaries in the coarsening stage and simple kinetic simulations predict the experimentally observed mean size evolution well when grain boundary diffusion of Cr is taken into account. However, the particle size distribution of M3C maintain a log-normal distribution throughout the whole extended tempering process (5000 h at 700 °C), which indicates that a modified LSW distribution , as predicted by classical steady-state coarsening theory , is not fully adequate for practical purposes in tempering of martensitic steels.

National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-233449OAI: oai:DiVA.org:kth-233449DiVA, id: diva2:1239930
Note

QC 20180821

Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2018-08-21Bibliographically approved
In thesis
1. An experimental and theoretical study of precipitation during tempering of martensite in Fe-C-Cr alloys
Open this publication in new window or tab >>An experimental and theoretical study of precipitation during tempering of martensite in Fe-C-Cr alloys
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 59
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-233502 (URN)978-91-7729-843-4 (ISBN)
Public defence
2018-09-14, sal F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
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Note

QC 20180821

Available from: 2018-08-21 Created: 2018-08-21 Last updated: 2020-05-11Bibliographically approved

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Hou, ZiyongBabu, PrasathHedström, PeterOdqvist, Joakim

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