Topological Approach to Ferrite/Martensite Dual-phase Microstructures

Sato, Naoko; Adachi, Yoshitaka; Kawata, Hiroyuki; Kaneko, Kenji

doi:10.2355/isijinternational.52.1362

Cited by 17 publications

(2 citation statements)

References 15 publications

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“…Likewise, curvatures can provide insight into the operating thermodynamics that operates in the geometry of a microstructure through H and K 25 . The 3D mesh supplies also information about global topology, a field of geometry of increasing interest in materials science 26 , 27 . Topology studies invariance of certain properties under smooth continuous mechanical deformation and it is characterised by an integer parameter called genus, g .…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional chemical mapping using non-destructive SEM and photogrammetry

Gontard¹,

Batista

Salguero

et al. 2018

Sci Rep

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The slice and view approach in electron microscopy defines an ensemble of destructive techniques that is widely used for studying in 3D the structure and chemistry of samples with dimensions ranging from µm to mm. Here, a method is presented for measuring with high resolution and quantitatively the morphology and chemical composition of the surface of a sample in 3D. It is non-destructive and therefore, it is complementary to slice and view methods. The scheme is based on the fusion of conventional scanning electron microscopy (SEM) imaging, multi-view photogrammetry and compositional mapping using energy dispersive X-ray spectroscopy (EDXS). We demonstrate its potential by performing an accurate study of adhesion wear of a tungsten carbide tool that is difficult to obtain using conventional characterization techniques.

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Section: Discussionmentioning

confidence: 99%

Three-dimensional chemical mapping using non-destructive SEM and photogrammetry

Gontard¹,

Batista

Salguero

et al. 2018

Sci Rep

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“…Sato et al 21) performed three-dimensional observations of martensite regions in DP steels, and showed that martensite takes various morphologies depending on the annealing conditions. Thus, for crystallographic microstructure analyses of high strength cold-rolled steels such as DP steels which have fine and complex grained microstructures, it is necessary to apply three-dimensional observations for identification of the orientation relationship between martensite and ferrite grains.…”

Section: Orientation Relationship Of Ferrite and Martensitementioning

confidence: 99%

Crystallographic Analysis of Lath Martensite in Ferrite-Martensite Dual Phase Steel Sheet Annealed after Cold-Rolling

Yoshida¹,

Takagi²,

Sakai

et al. 2015

ISIJ Int.

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Cold-rolled and annealed ferrite-martensite dual phase (DP) steel sheets are useful for automotive applications because of their excellent balance of strength and elongation. Although martensite in ferrite-martensite DP steels has important roll in the mechanical properties, the crystallography and microstructure of lath martensite in DP steels have not been investigated in detail. In this paper, the crystallography and microstructure of lath martensite in a ferrite-martensite DP steel were studied using electron microscopy and electron diffraction analysis, and the crystallographic orientation relationship between the ferrite and martensite was analyzed. The main results are as follows: (1) The lath martensite in DP steels consists of some packets, each of which contains several blocks. This structure is the same as that of lath martensite in fully martensitic steels. (2) The common parallel close-packed plane of the martensite laths in a packet tend to be parallel to the close-packed plane of the adjacent ferrite grain, whose fraction is about 30%.KEY WORDS: crystallography; lath martensite; dual phase steel; SEM/EBSD; orientation relationship between ferrite and martensite.

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