Effects of cooling rate and isothermal holding on the precipitation behavior during continuous casting of Nb–Ti bearing HSLA steels

Jun, Hyun Jo; Kang, Ki-Weon; Park, C.G.

doi:10.1016/j.scriptamat.2003.08.013

Cited by 58 publications

(29 citation statements)

References 4 publications

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“…[1,3,4] The nature, shape, and size of the microalloy precipitates have been widely investigated in as-cast slab as well as in thermomechanically controlled rolled (TMCR) HSLA steel plates/strips. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Both macroand microsegregation during casting may result in an inhomogeneous distribution of the precipitates. [7][8][9][10][11][16][17][18][19][20] The formation of large (>1 lm) Nb-rich dendritic precipitates [7,8,16,17] or eutectic (Nb,Ti,V)(C,N) particles [11] in the interdendritic boundaries indicated the segregation of microalloying elements, especially Nb.…”

Section: Carbide Nitride or Carbonitride Precipitatesmentioning

confidence: 99%

Prediction of Inhomogeneous Distribution of Microalloy Precipitates in Continuous-Cast High-Strength, Low-Alloy Steel Slab

Roy

Patra

Neogy

et al. 2012

Metall Mater Trans A

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Spatial distribution in size and frequency of microalloy precipitates have been characterized in two continuous-cast high-strength, low-alloy steel slabs, one containing Nb, Ti, and V and the other containing only Ti. Microsegregation during casting resulted in an inhomogeneous distribution of Nb and Ti precipitates in as-cast slabs. A model has been proposed in this study based on the detailed characterization of cast microalloy precipitates for predicting the spatial distribution in size and volume fraction of precipitates. The present model considers different models, which have been proposed earlier. Microsegregation during solidification has been predicted from the model proposed by Clyne and Kurz. Homogenization of alloying elements during cooling of the cast slab has been predicted following the approach suggested by Kurz and Fisher. Thermo-Calc software predicted the thermodynamic stability and volume fraction of microalloy precipitates at interdendritic and dendritic regions. Finally, classical nucleation and growth theory of precipitation have been used to predict the size distribution of microalloy precipitates at the aforementioned regions. The accurate prediction and control over the precipitate size and fractions may help in avoiding the hot-cracking problem during casting and selecting the processing parameters for reheating and rolling of the slabs.

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Section: Carbide Nitride or Carbonitride Precipitatesmentioning

confidence: 99%

Prediction of Inhomogeneous Distribution of Microalloy Precipitates in Continuous-Cast High-Strength, Low-Alloy Steel Slab

Roy

Patra

Neogy

et al. 2012

Metall Mater Trans A

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“…Various salt combinations for fusion have been utilized. H. Jo Jun et al [23] , used a mixture of three parts of Na 2 CO 3 and one part of H 3 BO 3 , and M. Saeki et al [19] suggest the use of sodium pyrosulfate. In the acid dissolution procedure, appropriate combinations of concentrated acids are utilized.…”

Section: I In Nt Tr Ro Od Du Uc Ct Ti Io On Nmentioning

confidence: 99%

Electrochemical extraction of microalloy carbides in Nb-steel

et al. 2008

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E El le ec ct tr ro oc ch he em mi ic ca al l e ex xt tr ra ac ct ti io on n o of f m mi ic cr ro oa al ll lo oy y c ca ar rb bi id de es s i in n N Nb b--s st te ee el l ( (• •) )A.L. Rivas * , E. Vidal ** , D.K. Matlock *** and J.G. Speer *** A Ab bs st tr ra ac ct t An electrochemical extraction technique was evaluated as a characterization method of precipitates in microalloyed steels. To carry out this study, a fully precipitated Nb-modified SAE 8620, was used. The investigation was accomplished by varying the electrolyte composition and the filter pore sizes used to collect the particles. The quantification of Nb was performed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Microscopy examination was also performed on extraction replicas and on residues collected in the acetate filters. Additionally, X-ray diffraction analysis (XRD) on the collected residues containing the precipitates was accomplished. The results showed that the dissolution rate is faster in the electrolyte consisting of 10 vol% HCl in water. Additionally, transmission electron microscopy (TEM) analysis along with chemical analysis by ICP-AES, showed that (Nb,Ti)C particles were collected in acetate filters with a pore size much larger than the precipitate size.K Ke ey yw wo or rd ds s (Nb,Ti)C precipitates; Electrochemical extraction; Steel matrix dissolution; Microalloyed steel; Anodic dissolution; Filtration.E Ex xt tr ra ac cc ci ió ón n e el le ec ct tr ro oq qu uí ím mi ic ca a d de e c ca ar rb bu ur ro os s d de e m mi ic cr ro oa al le ea ac ci ió ón n e en n N Nb b--a ac ce er ro o R Re es su um me en n La técnica de extracción electroquímica fue empleada para evaluar su efectividad en la caracterización de precipitados en aceros microaleados. Para realizar el estudio, se utilizó un acero SAE 8620 modificado con niobio. La investigación se llevó a cabo variando la composición del electrolito utilizado en la disolución electroquímica de la matriz y el tamaño de poro de los filtros usados para recolectar las partículas precipitadas. La cuantificación del contenido de Nb se hizo por espectroscopia de emisión atómica de plasma (ICP-AES). Además, las muestras obtenidas por réplicas de extracción y las provenientes de los residuos recolectados en los filtros fueron analizadas mediante microscopía electrónica de transmisión. Estas últimas muestras, también fueron caracterizadas por difracción de rayos X. Los resultados mostraron que la velocidad de disolución electroquímica de las muestras es mayor en el electrolito acuoso con 10 vol. % HCl. Adicionalmente, el análisis mediante microscopía electrónica de transmisión, en combinación con los análisis químicos mediante ICP-AES, mostró que las partículas de (Nb,Ti)C son recolectadas en filtros de acetato con tamaños de poro mucho mayor que el tamaño de las partículas precipitadas. P Pa al la ab br ra as s c cl la av ve e (Nb,Ti)C precipitados; Extracción electroquímica; Disolución electroquímica de la matriz de acero; Aceros microaleados; Disolución anódica de matriz...

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“…While substantial improvements have been made in the thermomechanical processing of steels, the secret of the success of HSLA steels is in the micro alloying where the addition of small amounts of elements such as niobium, titanium or vanadium can make all the difference. They are designed to meet specific mechanical properties rather than a chemical composition [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Exceptional combination of these advantages is a crucial need for thick steel plates used for the manufacturing of pressure vessels, ship hulls, line pipes, automobile, earth moving, mining equipment and various other strategic defense applications [9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Welding Parameters on Microstructural and Mechanical Properties of HSLA S960QL Type Steel with Submerged Arc Welding

Türker¹

2017

SDÜ Fen Bil Enst Der

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Abstract:In this study, S960QL steels were welded with submerged arc welding process in order to examine microstructural and mechanical properties. For the microstructural investigation, microscopical examination methods were used for weld zones. Tensile, impact toughness and micro hardness tests were made for different samples obtained from the weld zone and the base metal. The examinations of fracture surfaces were made by using optical microscope and scanning electron microscope. The flat type tensile strength values were near to the base materials. Charpy impact toughness tests were made for the base metal, the weld metal center line, the fusion line, the zone between weld metal centerline and the fusion line. Impact energy of the weld metal was obtained lower than the base metal. The lowest impact energy was obtained at the fusion line. Heat affected zone had the highest value in micro hardness tests. In microstructure evaluation, the interface of the fusion zone-heat affected zone and heat affected zone had coarser grain structure than the base metal. Alloy carbides dissolved because of the high temperature values occurred at heat affected zone. Tozaltı Ark Kaynağı Yöntemi

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Effects of cooling rate and isothermal holding on the precipitation behavior during continuous casting of Nb–Ti bearing HSLA steels

Cited by 58 publications

References 4 publications

Prediction of Inhomogeneous Distribution of Microalloy Precipitates in Continuous-Cast High-Strength, Low-Alloy Steel Slab

Prediction of Inhomogeneous Distribution of Microalloy Precipitates in Continuous-Cast High-Strength, Low-Alloy Steel Slab

Electrochemical extraction of microalloy carbides in Nb-steel

The Effect of Welding Parameters on Microstructural and Mechanical Properties of HSLA S960QL Type Steel with Submerged Arc Welding

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