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2023 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 54, no 4, p. 1083-1100Article in journal (Refereed) Published
Abstract [en]
The martensitic transformation was studied by in situ and ex situ experiments in two high-carbon, 0.54 and 0.74 wt pct C, steels applying three different cooling rates, 15 °C/s, 5 °C/s, and 0.5 °C/s, in the temperature range around Ms, to improve the understanding of the evolution of martensite tetragonality c/a and phase fraction formed during the transformation. The combination of in situ high-energy X-ray diffraction during controlled cooling and spatially resolved tetragonality c/a determination by electron backscatter diffraction pattern matching was used to study the transformation behavior. The cooling rate and the different Ms for the steels had a clear impact on the martensitic transformation with a decrease in average tetragonality due to stronger autotempering for a decreasing cooling rate and higher Ms. A slower cooling rate also resulted in a lower fraction of martensite at room temperature, but with an increase in fraction of autotempered martensite. Additionally, a heterogeneous distribution of martensite tetragonality was observed for all cooling rates.
Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Metallurgy and Metallic Materials Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-330024 (URN)10.1007/s11661-022-06948-z (DOI)000926394700004 ()2-s2.0-85147558305 (Scopus ID)
Note
QC 20230629
2023-06-292023-06-292023-12-07Bibliographically approved