Results 141 to 150 of about 391 (175)

The effect of niobium in solid solution on the transformation kinetics of bainite

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 1995
Abstract A study is made of the effect of niobium in solid solution in microalloyed austenite on the kinetics of transformation to bainite upon cooling, using a combination of dilatometry, scanning and transmission electron microscopy. The steels investigated are three laboratory melts with systematic variations in niobium concentration, and an ...
H K D H Bhadeshia
exaly   +2 more sources

On Bainite Transformation Kinetics and Mechanism

Materials Science Forum, 2007
The platelike bainitic ferrite growth rates were calculated by two modified diffusional models. Good agreements between experimental and theoretical results are found in Fe-0.59C wt.%, Fe-0.81C wt.% and Fe-0.478C-4.87Ni wt.% alloys. A slowing down effect due to the alloying element Mo is emphasized in Fe-0.69C-1.8Ni-0.8Mo wt.% alloy.
Si Xin Zhao, Wei Wang, Da Li Mao
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Bainitic transformation kinetics and stress assisted transformation

Materials Science and Technology, 2001
Abstract With reference to experimental data, the effects of stress, chemical composition, and transformation temperature on bainitic transformation kinetics are analysed. A decrease of transformation temperature or an increase of carbon equivalent results in a slow rate of bainitic transformation and reduces the promotive effect of stress induced ...
C.C. Liu, K.F. Yao, Z. Liu, X.J. Xu
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Kinetics model of bainitic transformation with stress

Metals and Materials International, 2018
Thermal simulations were conducted on a Gleeble 3800 simulator. The main purpose is to investigate the effects of stress on the kinetics of bainitic transformation in a Fe-C-Mn-Si advanced high strength bainitic steel. Previous studies on modeling the kinetics of stress affected bainitic transformation only considered the stress below the yield ...
Mingxing Zhou, Guang Xu, Haijiang Hu, Qing Yuan, Junyu Tian   +4 more
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Kinetics of bainite transformation in heterogeneous microstructures

Materials Letters, 2012
Abstract In classical models for microstructural evolution, the natural dispersion existing in the samples is often neglected. In this paper, we propose a general procedure that takes into account the distribution of austenite grain size on kinetics of bainite transformation in steels. Through this example and by comparison with experimental data, it
Gouné, M., Bouaziz, Olivier, Allain, S., Zhu, Kangying, Takahashi, M.   +4 more
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On the effect of plasticity on the kinetics of the isothermal bainitic transformation

International Journal of Microstructure and Materials Properties, 2010
Forging processes are accompanied by large plastic deformations and residual stresses. Depending on the local cooling rate the deformed material typically is in the stable or the supercooled austenitic state. The results show that plastic deformation of the stable austenite does not accelerate the kinetics of the isothermal bainitic phase ...
Hans Gerd Lambers, Sergej Tschumak, Hans Jurgen Maier   +2 more
openaire   +1 more source

The Kinetics of Bainitic Transformation of Roll Steel 75Kh3MF

Metal Science and Heat Treatment, 2018
The critical points of steel 75Kh3MF and the temperature of the start of martensitic transformation are determined by a dilatometric method. The thermokinetic and isothermal diagrams of decomposition of supercooled austenite are plotted. The microstructure and microhardness of steel specimens cooled at different rates are studied.
O. A. Kletsova, S. E. Krylova, E. Yu. Priymak, V. I. Gryzunov, S. V. Kamantsev   +4 more
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Continuous cooling transformation behaviour and bainite formation kinetics of new bainitic steel

Materials Science and Technology, 2016
In order to avoid the appearance of soft particles composed of ferrite or pearlite in the actual production of new bainitic steel, the phase transformation behaviour and bainite formation kinetics were investigated by DIL805A dilatometer, optical microscopy, scanning electron microscopy and Vickers-durometer.
Y.-F. Zheng, R.-M. Wu, X.-C. Li, X.-C. Wu   +3 more
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Bainite transformation kinetics Part 1 Modified model

Materials Science and Technology, 1992
AbstractAn earlier model for the overall transformation kinetics of bainite has been corrected and modified to be consistent with known details of the mechanisms of bainitic nucleation and growth. A comparison with published experimental data shows that the model is capable of accurately representing the development of transformation as a function of ...
G. I. Rees, H. K. D. H. Bhadeshia
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Kinetics of Martensitic transformation in partially bainitic 300M steel

Materials Science and Engineering: A, 1990
Abstract The kinetics of athermal martensitic transformation have been studied in a high silicon steel (300 M), beginning with samples which were first partially transformed to bainitic ferrite. It is found that the way in which the volume fraction of martensite increases with undercooling below the martensite start temperature is not greatly ...
S.A. Khan, H.K.D. Bhadeshia
openaire   +1 more source