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Microstructure evolution during tempering of martensitic Fe-C-Cr alloys at 700 A degrees C
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China.ORCID iD: 0000-0003-4825-7430
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: 0000-0003-1102-4342
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-3598-2465
2018 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 53, no 9, p. 6939-6950Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
SPRINGER , 2018. Vol. 53, no 9, p. 6939-6950
National Category
Materials Engineering
Identifiers
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
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VINNOVA
Note

QC 20180307

Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-04-18Bibliographically approved

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Hou, ZiyongHedström, PeterOdqvist, Joakim

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