scholarly journals Effect of Step Quenching Heat Treatments on the Kinetics of Ferrite Formation and Quenching & Partitioning Modeling for a Commercial C-Mn-Si Steel

2022 ◽  
Vol 25 ◽  
Author(s):  
Charles H. X. M. Magalhães ◽  
Pablo H. K. Campos ◽  
Geraldo L. Faria
Keyword(s):  
Heat Treatments ◽  
Ferrite Formation ◽  
Kinetics Of ◽  
Step Quenching

The Effect of Step Quenching on the Kinetics of Bainite Formation in Ferrous Alloys

1983 ◽  
Vol 21 ◽  
Author(s):  
M. Umemoto ◽  
M. Igarashi ◽  
I. Tamura
Keyword(s):  
Grain Boundaries ◽  
Optical Microscope ◽  
Microscope Observation ◽  
Ferrous Alloys ◽  
Stable Austenite ◽  
Kinetics Of ◽  
Step Quenching

ABSTRACTThe bainite reactions in the direct and in the step quenched conditions were compared using Fe–7.6Ni–0.48C and Fe–3.6Ni–1.45Cr–0.50C alloys. It was found that in both alloys the bainite reactions were markedly accelerated by step quenching to temperatures even in the stable austenite range prior to the transformation to bainite. Optical microscope observation revealed that this acceleration was caused by the enhanced nucleation of bainite at grain boundaries. This enhanced nucleation by step quench treatment was considered to be due to either the formation of carbon poor areas or the formation of ferrite embryos at the grain boundaries during holding at intermediate temperatures.

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.

Kinetics of Ferrite Formation in a Three-Phase System

2005 ◽  
Vol 38 (9) ◽  
pp. 727-733 ◽  
Author(s):  
Teizo Tsuchiya ◽  
Yoshikazu Miyake ◽  
Takanori Shigehisa ◽  
Ayako Tomita ◽  
Masahiko Watanabe
Keyword(s):  
Phase System ◽  
Ferrite Formation ◽  
Three Phase ◽  
Kinetics Of

scholarly journals Development of Nanobainitic Microstructures in Carbo-Austempered Cast Steels: Heat Treatment, Microstructure and Properties

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 635
Author(s):  
Oscar Ríos-Diez ◽  
Ricardo Aristizábal-Sierra ◽  
Claudia Serna-Giraldo ◽  
Jose A. Jimenez ◽  
Carlos Garcia-Mateo
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Heat Treatments ◽  
Second Step ◽  
Austenite Formation ◽  
Transformation Kinetics ◽  
Carburized Steel ◽  
Cast Steels ◽  
Final Microstructure ◽  
Kinetics Of

Carburizing implies the existence of a carbon gradient from the surface to the core of the steel, which in turn will affect both the critical temperature for austenite formation and the kinetics of the bainitic transformation during the austempering treatment. Therefore, for future development of carbo-austempered steels with nanobainitic microstructures in the case, it is key to understand the effect of such carbon gradient has on the final microstructure and the mechanical properties reached by the heat treatments used. This work was divided into two parts, firstly two alloys with similar carbon content to those at the surface and center of the carburized steel were used to establish the optimal heat treatment parameters and to study bainite transformation kinetics by high resolution dilatometry. In a second step, a carburized alloy is produced and subjected to the designed heat treatments, in order to evaluate the microstructure and mechanical properties developed. Results thus obtained are compared with those obtained in the same carburized alloy after following the most common quench and temper treatment.

scholarly journals The Effect of Plastic Deformation of Austenite on the Kinetics of Subsequent Ferrite Formation.

2001 ◽  
Vol 41 (9) ◽  
pp. 1028-1036 ◽  
Author(s):  
David N. Hanlon ◽  
Jilt Sietsma ◽  
Sybrand van der Zwaag
Keyword(s):  
Plastic Deformation ◽  
Ferrite Formation ◽  
Kinetics Of

Modeling of β→α Transformation in Complex Titanium Alloys

2011 ◽  
Vol 172-174 ◽  
pp. 1044-1049 ◽  
Author(s):  
Paolo Di Napoli ◽  
Benoît Appolaire ◽  
Elisabeth Aeby Gautier ◽  
Adeline Bénéteau
Keyword(s):  
Titanium Alloys ◽  
Phase Field ◽  
Nucleation And Growth ◽  
Heat Treatments ◽  
Β Phase ◽  
Growth Laws ◽  
Kinetics Of

A model has been developed which is able to predict the kinetics of β → α transformation in industrial multicomponent titanium alloys during complex heat treatments. It isbased on (i) analytical nucleation and growth laws based on simple geometric representationsof the di erent morphologies commonly observed in these alloys; (ii) the assumption of localequilibrium at interfaces, handled within the CalPhaD framework; (iii) averaged solute balancesin each morphology. The potentialities of the model will be demonstrated on the Ti17 industrialalloy upon isothermal holdings and cooling from the β phase field.

Thermo-Mechanically Processed Multi-Phase Ductile Iron: Microstructure Development

2010 ◽  
Vol 457 ◽  
pp. 199-204 ◽  
Author(s):  
Mohamed Soliman ◽  
Heinz Palkowski ◽  
Adel Nofal
Keyword(s):  
Ductile Iron ◽  
Deformation Process ◽  
Formation Temperature ◽  
Microstructure Development ◽  
Controlled Cooling ◽  
Ferrite Formation ◽  
Final Microstructure ◽  
Mn Content ◽  
Multi Phase ◽  
Kinetics Of

Using thermo-mechanical simulator equipped with dilatometry system, two ductile iron alloys with different Mn-content are processed by combining both, well defined deformation process and subsequent controlled cooling in a single processing chain to control the final microstructure. Accordingly, ductile irons with four different structrues are produced namely, martensite, ausferrite, martensite+ferrite and ausferrite+ferrite. Depending on the dilatometric measurments, the ferrite formation temperature-range has been defined for both alloys. Preferential transformation of austenite to ferrite at graphite nodules during cooling is observed. It is also observed that the formation of ferrite during cooling results in both decreased martensite start of the undecomposed austenite and accelerated kinetics of ausferrite formation.

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