Kinetics of austenite transformation and internal stresses in bainitic hardening of bearing steel

1986 ◽  
Vol 28 (4) ◽  
pp. 255-257 ◽  
Author(s):  
A. N. Kulakov ◽  
A. S. Kagan ◽  
A. A. Kapyrin
Keyword(s):  
Bearing Steel ◽  
Internal Stresses ◽  
Austenite Transformation ◽  
Kinetics Of ◽  
Bainitic Hardening

Laser Hardening of Steel

1983 ◽  
Vol 21 ◽  
Author(s):  
B. Bengtsson ◽  
W-B. Li ◽  
K.E. Easterling
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Medium Carbon Steel ◽  
Laser Hardening ◽  
Thermal Cycles ◽  
Medium Carbon ◽  
Austenite Transformation ◽  
Theoretical Predictions ◽  
Kinetics Of ◽  
Good Agreement

ABSTRACTChanges in microstructure due to phase transformation are measured for a number of laser-hardening treatments in both an Nb-microalloyed and a medium carbon steel. These measurements are correlated with theoretical predictions of laser thermal cycles and good agreement is obtained. The kinetics of the ferritic/pearlitic→austenite transformation are also discussed.

scholarly journals Analytical models of austenite transformation in steel with allowance for internal stresses

2018 ◽  
pp. 371-383
Author(s):  
S.V. Bobyr
Keyword(s):  
Experimental Data ◽  
Heat Treatment ◽  
Experimental Study ◽  
Hot Deformation ◽  
Structural Transformations ◽  
Analytical Models ◽  
Theoretical Expression ◽  
Internal Stresses ◽  
Kinetics Of ◽  
Comprehensive Study

The aim of the work is to review the analytical models of austenite decay, taking into account the internal stresses obtained by various authors. It is shown that a common drawback of the known works is the neglect of the effect of the stress-strain state arising during the heat treatment of parts on the kinetics of structural transformations, while the available experimental data indicate a significant effect of stresses and strains on structural transformations. It has been established that the experimental data accumulated to date do not allow reliably describing the effect of the stress state on structural transitions during the heat treatment of steels for the hot deformation tool. A simple theoretical expression is proposed for calculating the amount of martensite formed as a function of the voltage in the γ phase. It is theoretically shown that taking into account the voltage acting in the γ phase leads to an increase in the temperature of the end of the formation of martensite. Experimental study of this effect is especially convenient to carry out in isothermal conditions under uniaxial tension. It is shown that in order to reliably predict the structural state of the hot deformation tool during heat treatment, it is necessary to conduct a comprehensive study related to the experimental study of the effect of stresses on all types of transformations and the creation of an adequate mathematical model of austenite decomposition based on the obtained experimental data.

Kinetics of Internal Stresses of Water Varnishes

2021 ◽  
pp. 348-358
Author(s):  
Izet Horman ◽  
Esad Azemović ◽  
Amina Pandžo
Keyword(s):  
Internal Stresses ◽  
Kinetics Of

Kinetics of the austenite transformation in Cr−Mo−V steel with microadditives of rare-earth metals

1988 ◽  
Vol 30 (1) ◽  
pp. 19-23
Author(s):  
K. A. Lanskaya ◽  
V. V. Yarovoi ◽  
O. V. Basargin ◽  
L. V. Kulikova
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Austenite Transformation ◽  
Kinetics Of

Comparison of Two Methods of Calculation of Activation Energy for some Chosen Industrial Steels after its Oxidation at High-Temperatures in Air

2005 ◽  
Vol 237-240 ◽  
pp. 979-984
Author(s):  
Krzysztof Adamaszek ◽  
Zbigniew Jurasz
Keyword(s):  
Activation Energy ◽  
Parabolic Rate Constant ◽  
Bearing Steel ◽  
Chamber Furnace ◽  
Parabolic Law ◽  
Methods Of Calculation ◽  
Reciprocal Temperature ◽  
Kinetics Of ◽  
Energy Activation ◽  
Good Agreement

In this work it will be presented the results of calculation of energy activation Q of selected industrial steels (e.g. grade 55 - carbon steel, LH15 – bearing steel, H10S2M, 4H14N14W2M and 50H21G9N4 valve steels) according to Polish Norm by two methods. In the first method the calculations of Q are based on the dependence of value of parabolic growth rate constants kp in function of reciprocal temperature. The second method is based on the calculated parameters, which allow to determine the value of Q for examined steels by using value of Q for pure iron, taken from literature data, and the particular values of mass concentrations of elements in oxidised steels. The growth kinetics of layers were almost according to parabolic law. The values of parabolic rate constant kp were calculated on the basis of measurements of thickness of oxide layers. To the experiment the cylindrical specimens were used. The isothermal process of oxidation was conducted in chamber furnace at 1100, 1060, 1020, 980 and 940°C in the air. Time of oxidation various from 3 till 1303.5 hrs. The comparison of obtained results of activation energy Q for mentioned methods of each individual examined steels gives a good agreement.

Dynamic recrystallisation kinetics of GCr15 bearing steel

2008 ◽  
Vol 12 (4) ◽  
pp. 213-216 ◽  
Author(s):  
C. X. Yue ◽  
L. W. Zhang ◽  
S. L. Liao ◽  
J. B. Pei ◽  
H. J. Gao ◽  
...  
Keyword(s):  
Bearing Steel ◽  
Gcr15 Bearing Steel ◽  
Dynamic Recrystallisation ◽  
Kinetics Of
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