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Effect of carbon content on variant pairing of martensite in Fe-C alloys
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
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2012 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 60, no 20, 7265-7274 p.Article in journal (Refereed) Published
Abstract [en]

The effect of carbon content on the variant pairing tendency of martensite formed in Fe-C alloys is investigated by means of electron backscattered diffraction analysis. The method used is based on experimentally determined orientation relationships between austenite and martensite. The results show that the carbon content has a strong effect on the martensite variant pairing tendency. This observed change in variant pairing tendency is discussed in relation to the well-known morphological transition from lath to plate martensite in Fe-C alloys and the formation of packets and plate groups. The results indicate that quantitative analysis of variant pairing, as demonstrated here, may facilitate martensite characterization in Fe-C alloys as well as in other alloy systems.

Place, publisher, year, edition, pages
2012. Vol. 60, no 20, 7265-7274 p.
Keyword [en]
Carbon content, Crystallography, Electron backscattered diffraction, Fe-C alloy, Martensite
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-101163DOI: 10.1016/j.actamat.2012.09.046ISI: 000312679600037Scopus ID: 2-s2.0-84868214668OAI: oai:DiVA.org:kth-101163DiVA: diva2:546615
Funder
Vinnova
Note

QC 20121214. Updated from manuscript to article in journal.

Available from: 2012-08-24 Created: 2012-08-24 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Low Temperature Austenite Decomposition in Carbon Steels
Open this publication in new window or tab >>Low Temperature Austenite Decomposition in Carbon Steels
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Martensitic steels have become very important engineering materials in modern society. Crucial parts of everyday products are made of martensitic steels, from surgical needles and razor blades to car components and large-scale excavators. Martensite, which results from a rapid diffusionless phase transformation, has a complex nature that is challenging to characterize and to classify. Moreover the possibilities for modeling of this phase transformation have been limited, since its thermodynamics and kinetics are only reasonably well understood. However, the recent development of characterization capabilities and computational techniques, such as CALPHAD, and its applicability to ferrous martensite has not been fully explored yet.

In the present work, a thermodynamic method for predicting the martensite start temperature (Ms) of commercial steels is developed. It is based mainly on information on Ms from binary Fe-X systems obtained from experiments using very rapid cooling, and Ms values for lath and plate martensite are treated separately. Comparison with the experimental Ms of several sets of commercial steels indicates that the predictive ability is comparable to models based on experimental information of Ms from commercial steels.

A major part of the present work is dedicated to the effect of carbon content on the morphological transition from lath- to plate martensite in steels. A range of metallographic techniques were employed: (1) Optical microscopy to study the apparent morphology; (2) Transmission electron microscopy to study high-carbon plate martensite; (3) Electron backscattered diffraction to study the variant pairing tendency of martensite. The results indicate that a good understanding of the martensitic microstructure can be achieved by combining qualitative metallography with quantitative analysis, such as variant pairing analysis. This type of characterization methodology could easily be extended to any alloying system and may thus facilitate martensite characterization in general.

Finally, a minor part addresses inverse bainite, which may form in high-carbon alloys. Its coupling to regular bainite is discussed on the basis of symmetry in the Fe-C phase diagram.  

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xii, 77 p.
Keyword
Carbon steels, Electron backscattered diffraction, Martensite, Microscopy, Microstructure, Thermodynamic modeling
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-100993 (URN)978-91-7501-449-4 (ISBN)
Public defence
2012-09-27, F3, Lindstedsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
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Hero-m
Note

QC 20120824

Available from: 2012-08-24 Created: 2012-08-22 Last updated: 2012-08-24Bibliographically approved

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Borgenstam, Annika

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