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Retained Austenite Transformation during Heat Treatment of a 5 Wt Pct Cr Cold Work Tool Steel
University West, Department of Engineering Science, Research Enviroment Production Technology West.ORCID iD: 0000-0001-6300-5923
Uddeholms AB, S-68385 Hagfors, Sweden.
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0003-2560-0531
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-8822-2705
2017 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48A, no 11, p. 5233-5243Article in journal (Refereed) Published
Abstract [en]

Retained austenite transformation was studied for a 5 wt pct Cr cold work tool steel tempered at 798 K and 873 K (525 degrees C and 600 degrees C) followed by cooling to room temperature. Tempering cycles with variations in holding times were conducted to observe the mechanisms involved. Phase transformations were studied with dilatometry, and the resulting microstructures were characterized with X-ray diffraction and scanning electron microscopy. Tempering treatments at 798 K (525 degrees C) resulted in retained austenite transformation to martensite on cooling. The martensite start (M-s) and martensite finish (M-f) temperatures increased with longer holding times at tempering temperature. At the same time, the lattice parameter of retained austenite decreased. Calculations from the Ms temperatures and lattice parameters suggested that there was a decrease in carbon content of retained austenite as a result of precipitation of carbides prior to transformation. This was in agreement with the resulting microstructure and the contraction of the specimen during tempering, as observed by dilatometry. Tempering at 873 K (600 degrees C) resulted in precipitation of carbides in retained austenite followed by transformation to ferrite and carbides. This was further supported by the initial contraction and later expansion of the dilatometry specimen, the resulting microstructure, and the absence of any phase transformation on cooling from the tempering treatment. It was concluded that there are two mechanisms of retained austenite transformation occurring depending on tempering temperature and time. This was found useful in understanding the standard tempering treatment, and suggestions regarding alternative tempering treatments are discussed. (C) The Author(s) 2017.

Place, publisher, year, edition, pages
SPRINGER , 2017. Vol. 48A, no 11, p. 5233-5243
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11884DOI: 10.1007/s11661-017-4232-5ISI: 000412849400010Scopus ID: 2-s2.0-85029581719OAI: oai:DiVA.org:hv-11884DiVA, id: diva2:1162988
Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2017-12-13Bibliographically approved

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Rehan, ArbabSvensson, Lars-ErikKarlsson, Leif

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Research Enviroment Production Technology WestDivision of Welding Technology
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Manufacturing, Surface and Joining Technology

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