Dilatometric characterization of pearlite dissolution in 0.1c-0.5mn low carbon low manganese steel

The authors acknowledge financial support from the European Coal and Steel Community (ECSC- 7210. EC/939) and the Spanish Comisio´n Interministerial de Ciencia y Tecnologı´a (CICYT-MAT95-1192-CE)Peer reviewe

Kinetics Model of Isothermal Pearlite Formation in a 0.4C-1.6Mn Steel

The present article is concerned with a theoretical and experimental study of the growth kinetics of pearlite in a 0.4C-1.6Mn medium carbon steels. Factors controlling the isothermal formation of this microconstituent are explored in this work. In this sense, the transition temperature between local equilibrium (LE) and no partition local equilibrium (NPLE) growth mechanisms is theoretically determined. Moreover, the nucleation of pearlite has been considered as a cementite precipitation process on a moving austenite-ferrite interface. Finally, a theoretical model is presented in this work to calculate the evolution of austenite-to-pearlite transformation with time at a very wide temperature range.The authors acknowledge financial support from Spanish Ministerio de Ciencia y Tecnologı´a (MAT2001-1617). C. Capdevila would like to express his gratitude to the Consejo Superior de Investigaciones Cientifı´cas for financial support as a Post-Doctoral contract (I3P PC-2001-1). F.G. Caballero would like to thank the Consejerı´a de Educacio´n. D.G. de Investigacio´n de la Comunidad Auto´noma de Madrid (CAM) for the financial support in the form of a Postdoctoral Research GrantPeer reviewe

Estimation of dislocation density in bainitic microstructures using high-resolution dilatometry

It is possible by means of high resolution dilatometry together with a model based on isotropic dilatation and atomic volumes, to estimate the dislocation density introduced in the microstructure as a consequence of the isothermal decomposition of austenite into bainitic ferrite. The relatively high dislocation density associated with this microstructure is attributed to the fact that the shape deformation accompanying this displacive transformation is accommodated by plastic relaxationThe authors gratefully acknowledge the financial support of the Spanish MCYT. Plan Nacional deI+D (Programa I3 2007–2009) Ref. 200760I013 and the RFCS Programme for 2007 (Commission of the European Communities) Ref. RFSR-CT-2008-00022Peer reviewe

Kinetics Model of Isothermal Pearlite Formation in a 0.4C-1.6Mn Steel

The present article is concerned with a theoretical and experimental study of the growth kinetics of pearlite in a 0.4C-1.6Mn medium carbon steels. Factors controlling the isothermal formation of this microconstituent are explored in this work. In this sense, the transition temperature between local equilibrium (LE) and no partition local equilibrium (NPLE) growth mechanisms is theoretically determined. Moreover, the nucleation of pearlite has been considered as a cementite precipitation process on a moving austenite-ferrite interface. Finally, a theoretical model is presented in this work to calculate the evolution of austenite-to-pearlite transformation with time at a very wide temperature range.The authors acknowledge financial support from Spanish Ministerio de Ciencia y Tecnologı´a (MAT2001-1617). C. Capdevila would like to express his gratitude to the Consejo Superior de Investigaciones Cientifı´cas for financial support as a Post-Doctoral contract (I3P PC-2001-1). F.G. Caballero would like to thank the Consejerı´a de Educacio´n. D.G. de Investigacio´n de la Comunidad Auto´noma de Madrid (CAM) for the financial support in the form of a Postdoctoral Research GrantPeer reviewe

Influence of V Precipitates on Acicular Ferrite Transformation. Part 1: The Role of Nitrogen

6 pages, 8 figures, 1 table.-- This is Part I of paper "Influence of V Precipitates on Acicular Ferrite Transformation", Part II available at: http://hdl.handle.net/10261/17758Vanadium Award 2009-Council of the Institute of Materials, Minerals and Mining-UK for the most outstanding paper in the metallurgy and technology of vanadium and its alloys. Sponsored and selected by the Vanadium International Technical Committee (Vanitec).This paper (part 1 of a two part study) deals with the influence of N in its combination with V, as V(C, N) precipitates, on the decomposition of austenite into acicular ferrite. Likewise, the intragranular nucleation potency of V(C, N) precipitates is analyzed through the continuous cooling transformation diagrams (CCT) of two C–Mn–V steels with different contents of N under two different austenitising temperatures, i.e. different austenite grain sizes. The results clearly show that for austenite to decompose into acicular ferrite is necessary, first to have a representative fraction of V(C, N) precipitates within austenite, and second to decorate the austenite grain boundaries with proeutectoid ferrite so bainite can not form. Part 2 of the study concerns with the influence that those precipitates have on the kinetics of acicular ferrite formation during austenite isothermal decomposition.The authors would like to acknowledge the Commission of the European Communities for the financial support in the frame of the RFCS Programme for 2004 (RFS-PR-03136). Also to the Spanish MCYT through the project MAT2005-24485-E.Peer reviewe

Incubation time of isothermally transformed allotriomorphic ferrite in medium carbon steels

The authors acknowledge financial support from the Spanish Comisio´n Interministerial de Ciencia y Tecnologı´a (CICYT) (project-PETRI 95-0089-OP). GSB Acero S.A. and CEIT are thanked for providing the steel and their collaboration in this projectPeer reviewe

Modeling of the interlamellar spacing of isothermally formed pearlite in a eutectoid steel

The authors acknowledge financial support from the European Coal and Steel Community (ECSC-7210. EC/939) and the Spanish Comisio´n Interministerial de Ciencia y Tecnologı´a (CICYT-MAT95-1192-CE)Peer reviewe

Influence of processing parameters on the recrystallized microstructure of extra-low-carbon steels

This article deals with the influence of processing parameters of a new procedure for ferritic rolling on the recrystallized microstructure of extra-low-carbon (ELC) steels. Parameters such as coil transfer temperature and degree of reduction during ferritic rolling are shown to control the morphology of cementite particles and the precipitation of AIN process. The recrystallized grain morphology and the percentage of recrystallization after annealing cycles simulating the industrial coiling process are shown to be strongly influenced by processing parameters.Peer Reviewe

Influence of V(C,N) precipitates on microstructure and mechanical properties of continuous cooled C-Mn-V

The effect of chemical composition and processing parameters on the formation of acicular ferrite and/or bainite has been investigated. In particular, this paper deals with the influence that N through its combination with V, as V(C,N) precipitates, has on the decomposition of austenite. Likewise, the intragranular nucleation potency of V(C,N) precipitates is analyzed through the continuous cooling transformation diagrams (CCT) of two C-Mn-V steels with different contents of N. Results reported in this work allow us to conclude that acicular ferrite can only be achieved alloying with vanadium and nitrogen, meanwhile bainite is promoted in steels with a low level of nitrogen. It is concluded that higher strength values are obtained in acicular ferrite than in bainitic steel but a similar brittle-ductile transition temperature (BDT), and lower values of impact absorbed energy (KV) has been recorded in nitrogen-rich steel.VANITEC and the Spanish Ministerio de Ciencia e Innovacion for their financial supportPeer reviewe

Estudio de los parámetros de solidificación y enfriamiento en molde de las aleaciones férreas Fe-C-Mn y Fe-C-Cr-Mo, transformaciones de fase en estado sólido, diagramas TTT de enfriamiento contínuo, microestructuras y propiedades fisicomecánicas

Tesis Univ. Complutense de Madrid, 1978.Depto. de Física TeóricaFac. de Ciencias FísicasTRUEProQuestpu