Experimental Validation of the Carbon Diffusion Model for Transformation of Ferritic-Pearlitic Microstructure into Austenite during Continuous Annealing of Dual Phase Steels

Pernach, M.; Bzowski, Krzysztof; Kuziak, R.; Pietrzyk, M.

doi:10.4028/www.scientific.net/msf.762.699

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Dual phase and multiphase sheet steels containing retained austenite are grades of special interest due to their superior combination of high strength and ductility [1][2][3][4]. The final mechanical properties of the latter group showing transformation incuced plasticity effect are formed during forming under conditions of strain-induced martensitic transformation of metastable retained austenite [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study on Non-Metallic Inclusions in Laser-Welded TRIP-Aided Nb-Microalloyed Steel

Grajcar¹,

Różański²,

Kamińska³

et al. 2014

Archives of Metallurgy and Materials

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The work concerns the studies on non-metallic inclusions occuring in laser-welded Si-Al TRIP steel containing Nb and Ti microadditions. Laser welding tests of 2 mm thick thermomechanically rolled sheets were carried out using keyhole welding and a solid-state laser. The results of laser welding in the air atmosphere for the heat input value of 0.048 kJ/mm are included. The distribution, type and chemical composition of non-metallic inclusions formed in the base metal, heat-affected zone, and fusion zone are analysed in detail. It was found that the base metal contains rare, fine oxysulphides. Their chemical composition was modified by rare earth elements. Numerous oxide inclusions of a various size and a chemical composition occur in the fusion zone. The dependence between a size of particles and their chemical composition was observed. A microstructure of steel was assessed using light microscopy and scanning electron microscopy techniques.Keywords: TRIP steel, non-metallic inclusions, laser welding, multiphase microstructure, retained austenite, fusion zone, heat-affected zone Praca dotyczy badań wtrąceń niemetalicznych występujących w przetapianej laserowo stali TRIP typu Si-Al zawierającej mikrododatki Nb i Ti. Próby spawania laserowego odwalcowanych termomechanicznie taśm o grubości 2 mm przeprowadzono z wykorzystaniem lasera na ciele stałym i techniki głębokiego przetopienia. Przedstawiono wyniki przetapiania laserowego pró-bek z energią liniową 0.048 kJ/mm w atmosferze powietrza. Szczegółowej analizie poddano rozkład, rodzaj i skład chemiczny wtrąceń niemetalicznych tworzących się w materiale rodzimym, strefie wpływu ciepła i strefie przetopionej. Stwierdzono, że w materiale rodzimym występują nieliczne, drobne wtrącenia siarczkowo-tlenkowe, których skład chemiczny został zmodyfikowany przez pierwiastki ziem rzadkich. W strefie przetopionej występują liczne wtrącenia tlenkowe o zróżnicowanej wielkości i składzie chemicznym. Zaobserwowano zależność między wielkością wtrąceń a ich składem chemicznym. Mikrostrukturę stali określono z wykorzystaniem mikroskopii świetlnej i skaningowej mikroskopii elektronowej.

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Section: Introductionmentioning

confidence: 99%

Study on Non-Metallic Inclusions in Laser-Welded TRIP-Aided Nb-Microalloyed Steel

Grajcar¹,

Różański²,

Kamińska³

et al. 2014

Archives of Metallurgy and Materials

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“…A strain induced transformation of retained austenite into martensite upon forming resulted in a superior combination of strength and ductility of multiphase steels and led to the development of many advanced steel grades for the automotive industry. [1][2][3][4] The conventional transformation induced plasticity (TRIP) steels based on the 0.2C-1.5Mn-1.5Si or 0.2C-1.5Mn-1.5Al concept have a ferritic matrix with austenitic-bainitic islands. 1,5,6 The main disadvantages of ferrite based steels are their poor stretch flangeability and bendability, which are related to the local ductility.…”

Section: Introductionmentioning

confidence: 99%

Microstructure–property relationships in TRIP aided medium-C bainitic steel with lamellar retained austenite

Grajcar

Kwaśny

Zalecki

2015

Materials Science and Technology

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This work discusses the development of the microstructure and mechanical properties of medium-carbon steel that contains silicon, aluminium and microadditions of Nb and Ti. Two cooling strategies were designed based on the thermodynamic equilibrium calculations and continuous cooling transformation diagram, which was determined for plastically deformed austenite. The cooling paths enabled the production of ferrite based and bainite based steels. The specimens were obtained via the thermomechanical rolling process with isothermal holding of steel at 450°C. Microstructure investigations were performed using light, scanning and transmission microscopy methods. The distribution and amount of retained austenite were determined using the electron backscatter diffraction technique, whereas transmission electron microscopy allowed the identification of the morphology of the γ phase. The amount of austenite and its carbon content were assessed using X-ray diffraction. Relations between microstructure and mechanical properties were formulated based on the mechanical stability of the retained austenite.

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Application of the Mixed-Mode Model for Numerical Simulation of Pearlitic Transformation

Pernach

2019

J. of Materi Eng and Perform

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The multiscale model of pearlitic transformation, including the finite element solution of the second FickÕs equation with moving boundary in the microscale and Fourier equation in the macroscale, is presented in this paper. According to the mixed-mode approach, both the volume diffusion and the interface mobility were considered. Model describes sidewise and frontal growth of cementite and ferrite plates in a single grain of the austenite. Assessment of the possibility of the developed model application to determine the key parameters in terms of strength properties of pearlitic steel, i.e., pearlite grain size and colony size as well as interlamellar spacing for various cooling conditions, was the main aim of this work. The model was validated and verified on the basis of experimental tests performed for two eutectoid steels. In practice, developed model can support design process for a technology of high-strength rods and long products manufacturing. Rails were selected as a case study in this work, and therefore, numerical simulations of accelerated cooling of the rail head were performed and the relationship between the parameters of heat treatment, parameters of the structure and properties of the finished product was determined on the basis of obtained results.

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Experimental Validation of the Carbon Diffusion Model for Transformation of Ferritic-Pearlitic Microstructure into Austenite during Continuous Annealing of Dual Phase Steels

Cited by 4 publications

References 9 publications

Study on Non-Metallic Inclusions in Laser-Welded TRIP-Aided Nb-Microalloyed Steel

Study on Non-Metallic Inclusions in Laser-Welded TRIP-Aided Nb-Microalloyed Steel

Microstructure–property relationships in TRIP aided medium-C bainitic steel with lamellar retained austenite

Application of the Mixed-Mode Model for Numerical Simulation of Pearlitic Transformation

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