Journal ArticleDOI
Prediction of dendrite arm spacing for low alloy steel casting processes
M. El-Bealy,Brian G. Thomas +1 more
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In this paper, simple mathematical expressions to predict the primary dendrite arm spacing (PDAS) and secondary Dendrite Arm spacing (SDAS) suitable for steel casting processes are presented.Abstract:
Simple mathematical expressions to predict the primary dendrite arm spacing (PDAS) and secondary dendrite arm spacing (SDAS) suitable for steel casting processes are presented. The equations of the PDAS and SDAS were based on previously published experimental data for low alloy steels. Good agreement was obtained between previous measurements of dendrite arm spacing (DAS) and the model predications in the range of cooling rate occurring in steel casting processes. The results indicated that the cooling rate and carbon content basically govern the calculation of PDAS, especially for low carbon steel. However, the carbon content governs the selection of mathematical expression to predict SDAS for low alloy steels. Dendritic growth is the most common crystallization mechanism in industrial steels. Many empirical expressions have been employed to correlate the PDAS and SDAS with growth rate, temperature gradient, cooling rate, and local solidification time. However, the comparative advantages of the various expressions with respect to the accuracy with different types of steels remain unclear. Thus, the aim of the present study is to develop simple expressions to predict DAS as a function of carbon content and thermal conditions of low alloy steels.read more
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Simple Model of Microsegregation during Solidification of Steels
Young-Mok Won,Brian G. Thomas +1 more
TL;DR: In this paper, a simple analytical model of microsegregation for the solidification of multicomponent steel alloys is presented, based on the Clyne-Kurz model and extended to take into account the effects of multiple components, a columnar dendrite microstructure, coarsening, and the δ/γ transformation.
Journal ArticleDOI
In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing
TL;DR: In this paper, high framerate video recording of Selective Laser Melting (SLM) is used to provide useful insight on the laser-powder interaction and melt pool evolution of 316L powder layers, while also serving as a novel instrument to quantify cooling rates of the melt pool.
Journal ArticleDOI
A new criterion for internal crack formation in continuously cast steels
TL;DR: In this article, a new model for critical fracture stress given from the measured critical strain has been proposed to estimate the cracking condition in continuously cast steels, which can take into account the brittle temperature range and strain rate.
Book
Metallurgical and materials transactions. B, Process metallurgy and materials processing science
Journal ArticleDOI
The role of aluminium in chemical and phase segregation in a TRIP-assisted dual phase steel
Bernard Ennis,Bernard Ennis,Enrique Jimenez-Melero,Richard Mostert,Begoña Santillana,Peter D. Lee +5 more
TL;DR: In this article, the role of Al on the chemical segregation of Mn, Cr and Si during casting, and their impact on the phase transformations occurring during thermo-mechanical processing of the as-cast material was investigated.
References
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Journal ArticleDOI
Crack formation in the continuous casting of steel
J. K. Brimacombe,K. Sorimachi +1 more
TL;DR: In this paper, a review examines the different types of internal and surface cracks that can form during the continuous casting of steel and assesses the operating and metallurgical factors that are known to influence crack formation.
Journal ArticleDOI
Analysis of solute distribution in dendrites of carbon steel with δ/γ transformation during solidification
TL;DR: In this paper, the authors analyzed the diffusion and redistribution of solutes in dendrites during the solidification of carbon steel, and found that the diffusion in the phase δ-phase and the redistribution during δ/γ transformation played an important role in the variation of the interdendritic concentrations of the solutes with lower carbon concentration.
Journal ArticleDOI
Dendrite morphology of steady state unidirectionally solidified steel
Hatto Jacobi,Klaus Schwerdtfeger +1 more
TL;DR: In this paper, the authors derived the laws describing dendrite spacings in ingot solidified steel, where under parabolic growth conditions thermal gradients and growth velocity are coupled by heat flow.
Journal ArticleDOI
Formation of longitudinal, midface cracks in continuously-cast slabs
TL;DR: In this article, a mechanism for the formation of longitudinal, midface cracks in strand-cast slabs has been elucidated based on a series of related investigations, and the influence of the impinging metal stream, mold-powder practice, metal-level control, steel composition, end-plate taper, submold support and spray practice on the formation is explained in terms of this mechanism.
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