The crystallography of carbide-free bainites in thermo-mechanically processed low Si transformation-induced plasticity steels

Pereloma, Elena V.; Al-Harbi, Fayez; Gazder, Azdiar A.

doi:10.1016/j.jallcom.2014.05.123

Cited by 31 publications

(15 citation statements)

References 45 publications

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“…Blocky or elongated martensite was present as the second phase. In both steels, the martensite crystals comprise a number of sub-grains with low angle (~10 • ) boundaries between them in accordance with possible intervariant misorientation of 10.53 • [43] for Kurdjumov-Sachs relationship between the parent austenite (face centred cubic (fcc) crystal structure) and product martensite (body centred cubic (bcc) crystal structure, observe the rotation of diffraction patterns in neighbouring sub-grains in Figures 2 and 3). The diffraction analysis (points A, B and C in Figure 2b, and points A and B in Figure 3b) confirmed the bcc type of crystal structure of martensite.…”

Section: Grain Structure and Phase Balancementioning

confidence: 74%

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: Grain Structure and Phase Balancementioning

confidence: 74%

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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“…[1][2][3]. One of the most interesting and evolving groups of advanced steels for the automotive industry is the multiphase transformation-induced plasticity (TRIP)-aided steels consisting of ferrite, bainite, and retained austenite [4][5][6]. These steels utilize different strengthening mechanisms to improve their strength level, but the most important is the strain-induced transformation of retained austenite into martensite [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

Grajcar

Morawiec

Zalecki

2018

Metals

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The aim of the present study is to assess the effects of hot deformation and cooling paths on the phase transformation kinetics in a precipitation-strengthened automotive 0.2C–1.5Mn–0.5Si steel with Nb and Ti microadditions. The analysis of the precipitation processes was performed while taking into account equilibrium calculations and phase transitions resulting from calculated time–temperature–transformation (TTT) and continuous cooling transformation (CCT) diagrams. The austenite decomposition was monitored based on thermodynamic calculations of the volume fraction evolution of individual phases as a function of temperature. The calculations were compared to real CCT and DCCT (deformation continuous cooling transformation) diagrams produced using dilatometric tests. The research included the identification of the microstructure of the nondeformed and thermomechanically processed supercooled austenite products formed at various cooling rates. The complex interactions between the precipitation process, hot deformation, and cooling schedules are linked.

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“…For a comprehensive list, please refer to the Table 3 of Ref. ). Both the phenomena can be ascribed to the decays in the twin/matrix or inter‐variant misorientation relationships because of the ever larger local lattice rotations needed to maintain strain compatibility when dislocations continuously accumulate at the annealing twin or inter‐variant boundaries during tension.…”

Section: Resultsmentioning

confidence: 99%

Effect of Uniaxial Tension on the Microstructure and Texture of High Mn Steel

et al. 2018

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Cold-rolled to 42% thickness reduction and annealed at 500, 625, and 700 C, an Fe-17Mn-3Al-2Si-1Ni-0.06C wt% steel is subjected to uniaxial tension and characterized via digital image correlation and electron back-scattering diffraction. The cold-rolled and 500 C samples return similar microstructures comprising predominantly α 0 -martensite and remnant e-martensite fractions and a trace fraction of untransformed austenite (γ) before and after uniaxial tension. For the 625 and 700 C samples, uniaxial tension results in the transformation of the initially reverted and recrystallized γ into e and α 0martensite via strain localization. The γ shows the formation of h111i γ , h100i γ double-fiber texture, whereas the e and α 0 -martensite show the development of the {hkil} e and h110i α 0 || ND fibers, respectively. 10 12gh 1011i e È extension twinning is also observed in e-martensite upon uniaxial tension. The cold-rolled sample exhibits a mixed brittle and ductile fracture mode. The fracture of the 500 C sample is similar to that of the cold-rolled sample, whereas the 625 and 700 C samples display a ductile fracture mode.

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The crystallography of carbide-free bainites in thermo-mechanically processed low Si transformation-induced plasticity steels

Cited by 31 publications

References 45 publications

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

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

Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

Effect of Uniaxial Tension on the Microstructure and Texture of High Mn Steel

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