Searched for: mods_originInfo_publisher_s%3A%22Springer%22
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document
Goulas, C. (author), Mecozzi, M.G. (author), Sietsma, J. (author)
In this paper, the effect of chemical inhomogeneity on the isothermal bainite formation is investigated in medium-carbon low-silicon spring steel by dilatometry and microscopy. The analysis of the microstructure at different times during transformation shows that chemical segregation of substitutional alloying elements resulting from casting...
journal article 2016
document
Bojack, A. (author), Zhao, L. (author), Morris, P.F. (author), Sietsma, J. (author)
The influence of austenitization treatment of a 13Cr6Ni2Mo supermartensitic stainless steel (X2CrNiMoV13-5-2) on austenite formation during reheating and on the fraction of austenite retained after tempering treatment is measured and analyzed. The results show the formation of austenite in two stages. This is probably due to inhomogeneous...
journal article 2016
document
Navarro-Lopez, A. (author), Sietsma, J. (author), Santofimia, M.J. (author)
Thermomechanical processing of Advanced Multiphase High Strength Steels often includes isothermal treatments around the martensite start temperature (M s). It has been reported that the presence of martensite formed prior to these isothermal treatments accelerates the kinetics of the subsequent transformation. This kinetic effect is commonly...
journal article 2015
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Van Tol, R.T. (author), Kim, J.K. (author), Zhao, L. (author), Sietsma, J. (author), De Cooman, B.C. (author)
To understand the formation of ?'-martensite in high stacking fault energy twinning-induced plasticity steel deformed in the deep drawing mode, the existing phases were investigated using magnetic and transmission electron microscopy (TEM). Small fractions of ?'-martensite were quantitatively determined by magnetization saturation experiments...
journal article 2012
document
Savran, V.I. (author), Offerman, S.E. (author), Sietsma, J. (author)
Austenite nucleation and growth is studied during continuous heating using three-dimensional X-ray diffraction (3-D XRD) microscopy at the European Synchrotron Radiation Facility (ESRF) (Grenoble, France). Unique in-situ observations of austenite nucleation and growth kinetics were made for two commercial medium-carbon low-alloy steels (0.21 and...
journal article 2010
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Van Bohemen, S.M.C. (author), Sietsma, J. (author)
The progress of martensite formation in plain carbon steels Fe-0.46C, Fe-0.66C, and Fe-0.80C has been investigated by dilatometry. It is demonstrated that carbon enrichment of the remaining austenite due to intercritical annealing of Fe-0.46C and Fe-0.66C does not only depress the start temperature for martensite, but also slows the progress of...
journal article 2009
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Santofimia, M.J. (author), Zhao, L. (author), Sietsma, J. (author)
The “quenching and partitioning” (Q&P) process has been studied in a low-carbon steel containing 1.1 wt pct aluminum by heat treatments consisting of partial austenitization at 900 °C and subsequent rapid cooling to a quenching temperature in the range between 125 °C and 175 °C, followed by an isothermal treatment (partitioning step) at 250 °C...
journal article 2008
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Mecozzi, M.G. (author), Militzer, M. (author), Sietsma, J. (author), Van der Zwaag, S. (author)
Three-dimensional (3-D) phase-field simulations of the austenite (?) to ferrite (?) transformation during continuous cooling at different cooling rates were performed for an Fe-0.10C-0.49Mn (wt pct) steel, with the aim of studying the interaction between the assumed nucleation temperature range and the effective interfacial mobility when fitting...
journal article 2008
document
Luzginova, N.V. (author), Zhao, L. (author), Sietsma, J. (author)
The cementite spheroidization process is investigated in hypereutectoid steels with different chromium (Cr) contents. A spheroidized structure in high-carbon steel is usually obtained by a divorced eutectoid transformation (DET) reaction, which occurs during slow cooling of austenite with fine cementite particles. A bimodal distribution of...
journal article 2008
document
Savran, V.I. (author), Van Leeuwen, Y. (author), Hanlon, D.N. (author), Kwakernaak, C. (author), Sloof, W.G. (author), Sietsma, J. (author)
The microstructural evolution during continuous heating experiments has been studied for two C-Mn steels with carbon contents in the range 0.35 to 0.45 wt pct using optical microscopy, scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). It is shown that the formation of the austenitic phase is possible in pearlite as...
journal article 2007
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Rivera-Diaz-Del-Castillo, P.E.J. (author), Sietsma, J. (author), Van der Zwaag, S. (author)
A model for predicting the conditions under which ferrite/pearlite band formation occurs, and therefore the conditions in which it can be avoided in steels, has been developed. The model requires as input the alloy composition and microchemical segregation wavelength, and provides in turn the homogenization temperature and time in which the...
journal article 2004
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