Effect of the austenitizing temperature on the kinetics of the isothermal transformation of supercooled austenite in 55KhGR and 50KhG steels

1963 ◽  
Vol 5 (6) ◽  
pp. 316-317
Author(s):  
D. I. Bron ◽  
P. Ya. Gruzdov ◽  
I. I. Levites ◽  
A. G. Rakhshtadt
Keyword(s):  
Isothermal Transformation ◽  
Supercooled Austenite ◽  
Austenitizing Temperature ◽  
Kinetics Of

scholarly journals Isothermal Transformation Ar1 Product Morphology and Kinetics of EN-GJS-600-3 Cast Iron

2017 ◽  
Vol 17 (2) ◽  
pp. 119-124
Author(s):  
T. Szykowny ◽  
T. Giętka ◽  
K. Ciechacki ◽  
L. Panfil ◽  
Ł. Romanowski
Keyword(s):  
Cast Iron ◽  
Isothermal Transformation ◽  
Ductile Cast Iron ◽  
Eutectoid Reaction ◽  
Austenitizing Temperature ◽  
Metallographic Examination ◽  
Transmission Electron ◽  
Transformation Reaction ◽  
Quantitative Changes ◽  
Kinetics Of

AbstractThis work presents the qualitative and quantitative changes in the products of isothermal transformation (reaction) in a ductile cast iron austenite after supercooling to the temperature range Ar1. The austenitizing temperature considered in this work was 900, 960 or 1020°C. The eutectoid reaction was investigated by metallographic examination at a holding temperature right below Ar11(820°C) or right below Ar12(760°C). The quantitative metallographic examination was carried out with a light microscope (LM). The initial transformation stage products were identified with a transmission electron microscope (TEM). The selected samples were studied for chemical microsegregation of manganese, silicon, phosphorus, and carbon with an X-ray microanalyser (MAR). The tested cast iron material was found to predominantly feature a eutectoid reaction in the metastable system the ratio of which was increasing with the austenitizing temperature. The austenitizing temperature was found to be conducive to the evolution kinetics of individual phases and to the graphitization kinetics of the eutectoid cementite that was formed during the contemplated reaction.

Kinetics of the isothermal transformation of β-PbO2 into α-PbO2

1989 ◽  
Vol 138 (2) ◽  
pp. 277-283 ◽  
Author(s):  
C. Barriga ◽  
J. Morales ◽  
J.L. Tirado
Keyword(s):  
Isothermal Transformation ◽  
Kinetics Of

scholarly journals Application of Computer Simulation to Study the Features of the Austenite Isothermal Transformation in Steels

2019 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Yu.V. Yudin ◽  
M.V. Maisuradze ◽  
A.A. Kuklina ◽  
P.D. Lebedev
Keyword(s):  
Phase Transition ◽  
Computer Simulation ◽  
Solid State ◽  
Isothermal Transformation ◽  
Avrami Equation ◽  
Kinetic Curves ◽  
Simulation Results ◽  
Experimental Kinetics ◽  
Kinetics Of ◽  
New Phase

An algorithm was developed for the simulation of a phase transition in solid state whichmakes it possible to obtain the kinetic curves of transformation under different initialconditions (the number and arrangement of new phase nuclei, the distance betweenthe nearest nuclei). The simulation results were analyzed using the Kolmogorov-Johnson-Mehl-Avrami equation and the corresponding coefficients were determined.The correlation between the simulation results and the experimental kinetics of theaustenite isothermal transformation in alloyed steels was shown.

Isothermal transformation of supercooled austenite in steel 75KhSMF

1972 ◽  
Vol 14 (1) ◽  
pp. 75-76
Author(s):  
M. V. Gedeon ◽  
I. V. Paisov ◽  
V. S. Tomsinskii ◽  
S. P. Ponomareva
Keyword(s):  
Isothermal Transformation ◽  
Supercooled Austenite

Kinetics of decomposition of the supercooled austenite of 32G2 steel during continuous and interrupted accelerated quenching

1985 ◽  
Vol 27 (3) ◽  
pp. 174-177
Author(s):  
Yu. P. Gul' ◽  
V. S. Chmeleva ◽  
M. F. Evsyukov ◽  
Yu. V. Yakubovich ◽  
V. K. Chernykh
Keyword(s):  
Supercooled Austenite ◽  
Kinetics Of Decomposition ◽  
Kinetics Of

Kinetics of the transformation of supercooled austenite in steel 12Kh1MF

1977 ◽  
Vol 19 (6) ◽  
pp. 495-497
Author(s):  
M. B. Balakhovskaya ◽  
L. N. Davlyatova
Keyword(s):  
Supercooled Austenite ◽  
Steel 12Kh1mf ◽  
Kinetics Of

Stress affected transformation in low alloy steels – factors limiting prediction of plastic strains

2004 ◽  
Vol 120 ◽  
pp. 615-623
Author(s):  
U. Ahrens ◽  
H. J. Maier ◽  
A.EL.M. Maksoud
Keyword(s):  
Isothermal Transformation ◽  
Heat Treatments ◽  
Low Alloy Steels ◽  
Strain Response ◽  
Plastic Strains ◽  
Transformation Plasticity ◽  
Alloy Steels ◽  
Kinetics Of ◽  
Small Plastic Deformation ◽  
Made In

The present study identifies key material phenomena that limit the predictive capabilities of current approaches employed in modelling heat treatments of steels. Focus is on aspects relating to isothermal transformation in low alloy steels. Specifically, experimental data are presented relating to the effects of small plastic deformation on the kinetics of the phase transformation and on transformation plasticity. In addition, stress-strain response of supercooled austenite prior to transformation, i.e. in the temperature range between the A3-temperature and the martensite start temperature, has been determined experimentally. The data obtained demonstrate that the experimental results are only partially compatible with assumptions made in current models that are employed in modelling of heat treatments of steels.

Decomposition kinetics of supercooled austenite in moderate-carbon pipe steel

2008 ◽  
Vol 38 (8) ◽  
pp. 608-610
Author(s):  
V. A. Khotinov ◽  
E. S. Chernykh ◽  
S. Yu. Zhukova ◽  
V. P. Shveikin ◽  
V. M. Farber
Keyword(s):  
Pipe Steel ◽  
Decomposition Kinetics ◽  
Supercooled Austenite ◽  
Kinetics Of

Isothermal treatment of nitrided layers formed on steels

2019 ◽  
Vol 25 (4) ◽  
pp. 34-41
Author(s):  
Piotr Nawrocki ◽  
Jerzy Szawłowski
Keyword(s):  
Heat Treatment ◽  
Cross Sections ◽  
Nitrogen Saturation ◽  
Nitrided Layer ◽  
Isothermal Transformation ◽  
Isothermal Treatment ◽  
Surface Zone ◽  
Austenitizing Temperature ◽  
Treatment Processes ◽  
Different Content

This work was aimed at investigating the formation of nitrided layers during the isothermal transformation (austempering) and at describing the formed nitrided layer properties. The tested steels were characterized by a different content of carbon and alloying elements. In the case of the isothermal transformation, 4 variants of heat treatment parameters of nitrided layers were applied. The heat treatment differed in the austenitizing temperature (750°C–860°C) and the isothermal transformation temperature (390°C- 420°C). The microstructure and the mechanical properties (hardness) of the nitrided layers formed after the heat treatment processes were determined. After the nitriding process, during 30 hours in the nitriding atmosphere consisting only of ammonia, the high nitrogen saturation in the surface zone of the layers was obtained. The nitrided layers, after the heat treatment processes, were char-acterized by the diversified thickness, as evidenced by the hardness distributions at their cross-sections.

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