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Microstructure evolution during tempering of martensitic Fe-C-Cr alloys at 700 A degrees C
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China.ORCID-id: 0000-0003-4825-7430
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.ORCID-id: 0000-0003-1102-4342
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.ORCID-id: 0000-0003-3598-2465
2018 (engelsk)Inngår i: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 53, nr 9, s. 6939-6950Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The microstructure evolution of two martensitic alloys Fe-0.15C-(1.0 and 4.0) Cr (wt%) was investigated, using X-ray diffraction, electron backscatter diffraction, electron channeling contrast imaging and transmission electron microscopy, after interrupted tempering at 700 A degrees C. It was found that quenching of 1-mm-thick samples in brine was sufficient to keep most of the carbon in solid solution in the martensite constituent. The high dislocation density of the martensite decreased rapidly during the initial tempering but continued tempering beyond a few minutes did not further reduce the dislocation density significantly. The initial martensitic microstructure with both coarse and fine laths coarsened slowly during tempering for both alloys. However, a clear difference between the two alloys was distinguished by studying units separated by high-angle boundaries (HABs). In the low-Cr alloy, M3C precipitates formed and coarsened rapidly, thus they caused little hindrance for migration of HABs, i.e., coarsening of the HAB units. On the other hand, in the high-Cr alloy, M7C3 precipitates formed and coarsened slowly, thus they were more effective in pinning the HABs than M3C in the low-Cr alloy, i.e., coarsening of HAB units was minute in the high-Cr alloy.

sted, utgiver, år, opplag, sider
SPRINGER , 2018. Vol. 53, nr 9, s. 6939-6950
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Identifikatorer
URN: urn:nbn:se:kth:diva-223769DOI: 10.1007/s10853-018-2036-7ISI: 000424874900054Scopus ID: 2-s2.0-85040953153OAI: oai:DiVA.org:kth-223769DiVA, id: diva2:1188330
Forskningsfinansiär
VINNOVA
Merknad

QC 20180307

Tilgjengelig fra: 2018-03-07 Laget: 2018-03-07 Sist oppdatert: 2018-08-21bibliografisk kontrollert
Inngår i avhandling
1. An experimental and theoretical study of precipitation during tempering of martensite in Fe-C-Cr alloys
Åpne denne publikasjonen i ny fane eller vindu >>An experimental and theoretical study of precipitation during tempering of martensite in Fe-C-Cr alloys
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2018. s. 59
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Identifikatorer
urn:nbn:se:kth:diva-233502 (URN)978-91-7729-843-4 (ISBN)
Disputas
2018-09-14, sal F3, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20180821

Tilgjengelig fra: 2018-08-21 Laget: 2018-08-21 Sist oppdatert: 2019-08-20bibliografisk kontrollert

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