Journal ArticleDOI
Modelling phase transformations and material properties critical to the prediction of distortion during the heat treatment of steels
TLDR
In this paper, the authors describe the recent development of models in JMatPro for the calculation of phase transformations and material properties that are critical to the prediction of distortion during the heat treatment of steels.Abstract:
This paper describes the recent development of models in JMatPro for the calculation of phase transformations and material properties that are critical to the prediction of distortion during the heat treatment of steels. The success of these models is based on the accurate description of all the major phase transformations taking place, including the formation of ferrite, pearlite, bainite and martensite, as well as the calculation of the properties of the different phases formed during the heat treatment process. One advantage of the current models is that they can be applied to many types of steels, including medium- to high-alloy types. A wide range of properties such as density, thermal expansion coefficient, thermal conductivity, strength and hardness can be calculated, all as a function of time, temperature and cooling rate, even for an arbitrary cooling profile. The material data calculated from JMatPro have been exported directly to Finite Element (FE)/Finite Difference(FD)-based packages for forging/deformation simulation.read more
Citations
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Journal ArticleDOI
Distortion in quenching an AISI 4140 C-ring – Predictions and experiments
A.D. da Silva,A.D. da Silva,Tércio Assunção Pedrosa,J.L. Gonzalez-Mendez,X. Jiang,Paulo Roberto Cetlin,T. Altan +6 more
TL;DR: In this article, the results of a finite element simulation of the quenching of an AISI 4140 steel C-ring in oil are presented, covering the analysis of the distortion caused by both thermal contraction and phase transformation, as well as the hardness and martensite volume fractions.
Journal ArticleDOI
A combined experimental and numerical examination of welding residual stresses
TL;DR: In this paper, the authors examined residual stresses in bead-on-plate welded specimens in transverse direction over the thickness of the plate, using a combination of experimental and numerical procedures.
Journal ArticleDOI
Residual stresses formation in multi-pass weldment: A numerical and experimental study
Gancho Genchev,Nikolay Doynov,Ralf Ossenbrink,Vesselin Michailov,Gizo Bokuchava,Peter K. Petrov +5 more
TL;DR: In this article, the residual stresses distribution induced by multi-pass arc welding of the steel S355J2+N are investigated experimentally and numerically using a neutron diffraction method on a fourier stress diffractometer.
Dissertation
Modélisation numérique du grenaillage des pièces initialement cémentées ou carbonitrurées
TL;DR: In this paper, the authors propose a modele element fini du grenaillage des pieces prealablement traitees thermochimiques, i.e., pieces with a traitee thermogimiquement (par cementation ou carbonitruration) for the generation of champs mecaniques.
Journal ArticleDOI
Effect of Immersion Routes on the Quenching Distortion of a Long Steel Component Using a Finite Element Model
R.D. López-García,F. A. Garcia-Pastor,M. J. Castro-Román,E. Alfaro-Lopez,Francisco A. Acosta-González +4 more
TL;DR: In this article, the authors present the results of a numerical and experimental investigation that assessed the effect of both the austenite grain size (AGS) of three sizes 8, 9 and 10 ASTM, and the immersion route on the distortion of a long component of SAE 5160 steel during oil quenching.
References
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Journal ArticleDOI
Thermodynamic analysis of isothermal transformation diagrams
TL;DR: In this paper, a thermodynamic method has been developed to allow the prediction of isothermal transformation diagrams, starting simply from a knowledge of the chemical composition of the steel concerned, and has been shown to be capable of faithfully reproducing the critical "bay region" of time-temperature-transformation (TTT) curves.
Journal ArticleDOI
A computational model for the prediction of steel hardenability
TL;DR: In this paper, a computational model is presented for the prediction of microstructural development during heat treating of steels and resultant room-temperature hardness. But the model was applied in this study to predict the hardness distribution in end-quench bars (Jominy hardness) of heat treatable steels.
Journal ArticleDOI
Driving force for martensitic transformation in steels
TL;DR: In this article, the free energy change accompanying martensite formation at the Ms temperature of steels was evaluated using various thermodynamic methods together with relatively accurate and recent thermodynamic results.
Journal ArticleDOI
A methodology for the prediction of time-temperature-transformation diagrams
Jye-Long Lee,Harry Bhadeshia +1 more
TL;DR: In this article, a method based on nucleation theory but using fitted constants was used to model the time-temperature-transformation diagrams of steels and the transformation-start C-curves on the diagrams were represented as functions of the free energy of nucleation and of an activation energy.