Precise measurement of strain accommodation in austenite matrix surrounding martensite in ferrous alloys by electron backscatter diffraction analysis

Miyamoto, Gorō; Shibata, Akinobu; Maki, Tadashi; Furuhara, Tadashi

doi:10.1016/j.actamat.2008.10.050

Cited by 188 publications

(96 citation statements)

References 21 publications

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“…However, the plastic deformation has also been reported to occur in the γ phase surrounding the lenticular and lath martensite in ferrous alloys. [43][44][45] Furthermore, it has been noted that the dislocation in the γ phase is inherited by the α ′ phase near the interface region. 44) Although the plastic strain in the γ phase would be smaller than that in the α ′ phase, 23,24,26) the plastic deformation in the γ phase could reduce the elastic energy associated with the MT and hence could influence the transformation kinetics and martensitic morphology.…”

Section: Plasticity During the Mtmentioning

confidence: 99%

Phase-field Simulation of Habit Plane Formation during Martensitic Transformation in Low-carbon Steels

Tsukada

Kojima²,

Koyama

et al. 2015

ISIJ International

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The origin of the habit plane of the martensite phase (α ′) in low-carbon steels is elucidated by threedimensional phase-field simulations. The cubic → tetragonal martensitic transformation and the evolution of dislocations with Burgers vector a α ′ /2〈111〉 α ′ in the evolving α ′ phase are modeled simultaneously. By assuming a static defect in the undercooled parent phase (γ ), we simulate the heterogeneous nucleation in the martensitic transformation. The transformation progresses with the formation of the stress-accommodating cluster composed of the three tetragonal domains of the α ′ phase. With the growth of the α ′ phase, the habit plane of the martensitic cluster emerges near the (111) γ plane, whereas it is not observed in the simulation in which the slip in the α ′ phase is not considered. We observed that the formation of the (111) γ habit plane, which is characteristic of the lath martensite that contains a high dislocation density, is attributable to the slip in the α ′ phase during the martensitic transformation.

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Section: Plasticity During the Mtmentioning

confidence: 99%

Phase-field Simulation of Habit Plane Formation during Martensitic Transformation in Low-carbon Steels

Tsukada

Kojima²,

Koyama

et al. 2015

ISIJ International

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“…Several authors (Adams 1997;Sun et al 1998;El-Dasher et al 2003;Field et al 2005;Kysar et al 2007;Larson et al 2007;Demir et al 2009;Pantleon et al 2008;Zisman et al 2008;Miyamoto et al 2009) have used the lattice curvatures to calculate densities of GNDs within samples, using Hough-based EBSD, which has a lower angular resolution and thus is severely limited for GND analysis (the lower bound is capped by angular noise, at approx. 1 × 10 14 GNDs m −2 ).…”

Section: Ebsd Analysis Of Gnd Contentmentioning

confidence: 99%

The effect of crystal orientation on the indentation response of commercially pure titanium: experiments and simulations

2009

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This study combines nanoindentation, electron backscatter diffraction (EBSD) and crystal plasticity finite element analysis to examine the anisotropy in the indentation behaviour of individual grains within an α-Ti polycrystal. Nanoindentation is utilized to mechanically probe small volumes of material within grains for which orientations are known from prior EBSD mapping. Both indentation modulus and hardness decrease significantly as the indentation axis is inclined further from the c-axis; the plastic response showing the more marked anisotropy. Recently developed high angular resolution EBSD has been utilized to examine selected indents, providing maps of elastic strain variations and lattice rotations. From such maps lower bound solutions for the density of geometrically necessary dislocations (GNDs) have been established. Crystal plasticity modelling showed promise in capturing correctly the orientation dependence of load-displacement response and in lattice rotations local to the indenter, particularly for indentation into a basal plane which generated threefold rotational symmetry about an axis parallel with the indentation direction which was also observed in experiments.

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“…Such deformation texture of γ coincides also well with the deformation texture reported in fcc metal after compression rolling 27) and in γ of the Fe-30%Ni specimen compressed at 573 K. 28) Displacive transformation such as martensite and bainite transformations causes a lattice rotation in surrounding γ due to accommodation of transformation strain. 21) However, the present reconstruction method reproduces the spreading of γ orientation in each γ grain and the development of deformation texture by ausforming successfully. This fact clearly supports that the lattice rotation in γ due to the ausforming can be reconstructed by the present method.…”

Section: )mentioning

confidence: 99%

Reconstruction of Parent Austenite Grain Structure Based on Crystal Orientation Map of Bainite with and without Ausforming

et al. 2011

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By using a reconstruction program recently developed by the present authors, the parent austenite grain structure is reconstructed from the crystal orientation map of bainite structure. Local austenite orientation can be reconstructed from non-ausformed bainite structure with errors of 1.7° and 1.0° at spatial resolutions of 5 and 20 μ m respectively. The angle of errors is further reduced to be less than 0.5° when an analysis area is extended to a whole austenite grain. Application of the reconstruction program to the bainite structure transformed from deformed austenite has clarified that the variation in grain shape and deformation texture of parent austenite can be well reconstructed.

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Precise measurement of strain accommodation in austenite matrix surrounding martensite in ferrous alloys by electron backscatter diffraction analysis

Cited by 188 publications

References 21 publications

Phase-field Simulation of Habit Plane Formation during Martensitic Transformation in Low-carbon Steels

Phase-field Simulation of Habit Plane Formation during Martensitic Transformation in Low-carbon Steels

The effect of crystal orientation on the indentation response of commercially pure titanium: experiments and simulations

Reconstruction of Parent Austenite Grain Structure Based on Crystal Orientation Map of Bainite with and without Ausforming

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