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Model of Phase Transformation for Niobium Microalloyed Steels
by
Niżnik, B.
, Pietrzyk, M.
in
carbonitride precipitation process
/ Cooling
/ Deformation
/ Dilatometry
/ Experiments
/ Finite element method
/ High strength low alloy steels
/ Hot rolling
/ Kinetics
/ Manganese steel
/ Microalloying
/ Microstructure
/ model of phase transformation
/ multiscale modelling
/ Niobium carbonitride
/ niobium microalloyed steels
/ Numerical models
/ Phase transitions
/ Powder metallurgy
/ Precipitates
/ Quantitative analysis
/ Strain
/ Testing laboratories
/ Thermomechanical treatment
2011
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Model of Phase Transformation for Niobium Microalloyed Steels
by
Niżnik, B.
, Pietrzyk, M.
in
carbonitride precipitation process
/ Cooling
/ Deformation
/ Dilatometry
/ Experiments
/ Finite element method
/ High strength low alloy steels
/ Hot rolling
/ Kinetics
/ Manganese steel
/ Microalloying
/ Microstructure
/ model of phase transformation
/ multiscale modelling
/ Niobium carbonitride
/ niobium microalloyed steels
/ Numerical models
/ Phase transitions
/ Powder metallurgy
/ Precipitates
/ Quantitative analysis
/ Strain
/ Testing laboratories
/ Thermomechanical treatment
2011
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Model of Phase Transformation for Niobium Microalloyed Steels
by
Niżnik, B.
, Pietrzyk, M.
in
carbonitride precipitation process
/ Cooling
/ Deformation
/ Dilatometry
/ Experiments
/ Finite element method
/ High strength low alloy steels
/ Hot rolling
/ Kinetics
/ Manganese steel
/ Microalloying
/ Microstructure
/ model of phase transformation
/ multiscale modelling
/ Niobium carbonitride
/ niobium microalloyed steels
/ Numerical models
/ Phase transitions
/ Powder metallurgy
/ Precipitates
/ Quantitative analysis
/ Strain
/ Testing laboratories
/ Thermomechanical treatment
2011
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Model of Phase Transformation for Niobium Microalloyed Steels
Journal Article
Model of Phase Transformation for Niobium Microalloyed Steels
2011
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Overview
The paper presents the results of physical and numerical modeling of the kinetics of phase transformation, taking into account the precipitation of niobium carbonitride. Strain induced precipitation is a phenomenon, which controls the evolution of the microstructure in these steels during thermo-mechanical treatment. For the numerical simulation of precipitation Dutta-Sellars model was used, which describes the precipitation kinetics of Nb (C, N) at dislocations in the deformed and non-deformed austenite. The size of precipitates after continuous cooling of steel was calculated using the additivity rule. Numerical model combines a solution of the finite element method with model of phase transitions. Physical modeling included dilatometric study and rolling of rods made of niobium microalloyed steel. Microstructure studies were also carried out. Developed model allowed the assessment of the influence of precipitation on the progress of phase transition. Verification of model prediction by comparison with the experiments carried out in conditions close to semi-industrial is described in the paper, as well.
W pracy przedstawiono wyniki modelowania fizycznego oraz model numeryczny opisujący kinetykę przemiany fazowej z uwzględnieniem procesu wydzieleniowego węglikoazotku niobu. Proces ten silnie wpływa na zmiany zachodzące w mikrostrukturze tych stali w trakcie obróbki cieplno - plastycznej. Do symulacji numerycznej procesu wydzieleniowego wykorzystano model Dutty-Sellarsa opisujący kinetykę procesu wydzieleniowego Nb(C, N) na dyslokacjach w austenicie odkształconym i nieodkształconym. Wielkość wydzieleń w warunkach ciągłego chłodzenia stali obliczona została z wykorzystaniem reguły addytywności. Model numeryczny łączy rozwiązanie metodą elementów skończonych z modelem przemian fazowych. Modelowanie fizyczne obejmowało badania dylatometryczne oraz walcowanie prętów ze stali z mikrododatkiem niobu uzupełnione badaniami mikrostruktury. Opracowany model pozwolił na ocenę wpływu procesu wydzieleniowego na postęp przemiany fazowej. Wyniki modelowania zweryfikowano doświadczalnie w warunkach zbliżonych do półprzemysłowych.
Publisher
Versita,Polish Academy of Sciences
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