AP-FIM study on the effect of Mo addition on microstructure in Ti-Nb steel

Uemori, Ryuji; Chijiiwa, Rikio; Tamehiro, Hiroshi; Morikawa, Hirofumi

doi:10.1016/0169-4332(94)90351-4

Cited by 62 publications

(26 citation statements)

References 2 publications

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“…In high strength low alloyed steels Mo is well known to provide phase balance strengthening, via facilitating the bainite transformation [1][2][3][4][5], and solid solution strengthening [6][7][8][9]. It can decrease the rate of dynamic recrystallization of austenite [10][11][12], which may lead to grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Comparative Effect of Mo and Cr on Microstructure and Mechanical Properties in NbV-Microalloyed Bainitic Steels

Kostryzhev

Singh

Chen

et al. 2018

Metals

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Steel product markets require the rolled stock with further increasing mechanical properties and simultaneously decreasing price. The steel cost can be reduced via decreasing the microalloying elements contents, although this decrease may undermine the mechanical properties. Multi-element microalloying with minor additions is the route to optimise steel composition and keep the properties high. However, this requires deep understanding of mutual effects of elements on each other's performance with respect to the development of microstructure and mechanical properties. This knowledge is insufficient at the moment. In the present work we investigate the microstructure and mechanical properties of bainitic steels microalloyed with Cr, Mo, Nb and V. Comparison of 0.2 wt. % Mo and Cr additions has shown a more pronounced effect of Mo on precipitation than on phase balance. Superior strength of the MoNbV-steel originated from the strong solid solution strengthening effect. Superior ductility of the CrNbV-steel corresponded to the more pronounced precipitation in this steel. Nature of these mechanisms is discussed.

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Section: Introductionmentioning

confidence: 99%

Comparative Effect of Mo and Cr on Microstructure and Mechanical Properties in NbV-Microalloyed Bainitic Steels

Kostryzhev

Singh

Chen

et al. 2018

Metals

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“…These particles are rich in Nb and also contain some amount of Ti and Mo, as revealed by the EDS spectrum of figure 4B. The presence of Mo in the Nb precipitates has been reported for other researchers [35] . Figure 4C shows larger particles with a square shape.…”

Section: 4 4 C Ch He Em Mi Ic Ca Al L a An Na Al Ly Ys Si Is Smentioning

confidence: 66%

“…Low coarsening rates of these particles may be attributable to the Mo segregation to the precipitate/ferrite interface. Molybdenum modifies the interfacial energy and possibly restricts the diffusion of Nb atoms from ferrite to the Nb rich particles, as pointed out by Uemori et al [35] . Figure 6 shows a diffraction pattern of the residue collected in the Anodisc TM filter for a sample treated at 700 °C for 2 h. Most of the peaks correspond to cementite, while there are other carbide and nitride peaks also present in this specimen.…”

Section: 4 4 C Ch He Em Mi Ic Ca Al L a An Na Al Ly Ys Si Is Smentioning

confidence: 85%

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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“…It has been indicated that the HSLA steels containing both Nb and Mo exhibited superior strength to the conventional HSLA steels containing Nb and V [1,2]. Shirakashi et al [3] studied flow stress with strain rate and temperature using low carbon steel [3] and Kim et al [4] also researched flow stress through compression test and hot torsion test using AISI 4140 steel to investigate the effect of deformation mode on constitutive relation.…”

Section: Introductionmentioning

confidence: 99%