In situ analysis of the effect of high heating rates and initial microstructure on the formation and homogeneity of austenite

Eggbauer, Annika; Lukas, Marina; Ressel, Gerald; Prevedel, Petri; Martín, Francisca Méndez; Keckes, Jozef; Stark, Andreas; Ebner, R.

doi:10.1007/s10853-019-03527-3

Cited by 14 publications

(14 citation statements)

References 19 publications

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“…Using synchrotron radiation even A cc , which is the dissolution temperature of cementite, could be analyzed as shown in ref. . It should be mentioned, that for the initial SA microstructure A cc is higher than the maximum temperature applied in this wok in case of the heating rate of 100 K s −1 .…”

Section: Methodsmentioning

confidence: 81%

“…In ref. , it was found, that the FP initial state showed increased homogeneity and decreasing lattice strain within the austenite with higher austenitizing temperature. Conversely, the SA initial state exhibited a constant level of FWHM with increasing temperatures.…”

Section: Discussionmentioning

confidence: 94%

“…The time–temperature austenitization behavior of the investigated 50CrMo4 steel in the two different initial microstructures was determined earlier by Eggbauer et al by means of synchrotron radiation. Since transformation kinetics during austenitization is discussed later, the time temperature austenitization behavior is shown in Figure .…”

Section: Methodsmentioning

confidence: 91%

“…The highest grain average misorientation (GAM) is acquired by FP‐10‐950. The homogeneity of austenite can be evaluated by means of the full width half maximum (FWHM) of the austenitic peak in situ diffraction experiments using synchrotron radiation are shown in another work of the authors . FWHM can be affected by chemical inhomogeneities as well as by strain across austenite grains.…”

Section: Discussionmentioning

confidence: 99%

“…Time temperature austenitization diagram for the selected steel, achieved by means of synchrotron experiments . A c1 marks the temperature of the first occurrence of austenite during heating, A c3 is the temperature at which ferrite disappears, and A cc is the temperature of complete cementite dissolution.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Initial Microstructure, Heating Rate, and Austenitizing Temperature on the Subsequent Formation of Martensite and Its Microstructural Features in a QT Steel

Eggbauer

Lukas

Prevedel

et al. 2018

steel research int.

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Goal of this work is to study the effect of initial microstructure and different fast austenitization treatments with high heating rates and short dwell times on the transformation behavior of austenite to martensite and the resulting microstructural martensite features. A deeper understanding is gained regarding influences of the time temperature program during austenitization on strain within the martensite. Therefore, specimens with two microstructures, a ferritic/pearlitic and a soft annealed state, are heat treated with heating rates of 1–100 K s–1 to different austenitization temperatures and held for 3 s. Distinct differences in initial microstructures is their cementite size and morphology. For the investigations of the martensitic transformation, its microstructure and its distortions dilatometry experiments are conducted and Electron Back Scattered Diffraction (EBSD) is used. The investigations show that strain and inhomogeneities within the austenite are passed to the martensitic microstructure and lead to higher distortions within the ferritic martensite crystals. Strain within the martensitic microstructure decreases with increasing austenitization temperature and decreasing heating rates. Especially, the carbon content in solution, which is increasing with increasing austenitizing temperature and smaller initial cementite size, is influencing martensitic features, such as martensite start temperature and block sizes.

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Section: Methodsmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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