Journal ArticleDOI
Effect of hardness of martensite and ferrite on void formation in dual phase steel
TLDR
In this article, the influence of the hardness of martensite and ferrite phases in dual phase steel on void formation has been investigated by in situ tensile loading in a scanning electron microscope.Abstract:
The influence of the hardness of martensite and ferrite phases in dual phase steel on void formation has been investigated by in situ tensile loading in a scanning electron microscope. Microstructural observations have shown that most voids form in martensite by evolving four steps: plastic deformation of martensite, crack initiation at the martensite/ferrite interface, crack propagation leading to fracture of martensite particles and void formation by separation of particle fragments. It has been identified that the hardness effect is associated with the following aspects: strain partitioning between martensite and ferrite, strain localisation and critical strain required for void formation. Reducing the hardness difference between martensite and ferrite phases by tempering has been shown to be an effective approach to retard the void formation in martensite and thereby is expected to improve the formability.read more
Citations
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I and i
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Journal ArticleDOI
An Overview of Dual-Phase Steels: Advances in Microstructure-Oriented Processing and Micromechanically Guided Design
Cemal Cem Tasan,Martin Diehl,Dingshun Yan,Marion Bechtold,Franz Roters,Lars Schemmann,Chengwu Zheng,N. Peranio,Dirk Ponge,Motomichi Koyama,Kaneaki Tsuzaki,Dierk Raabe +11 more
TL;DR: In this article, the authors provide a detailed account of these improvements, focusing specifically on microstructure evolution during processing, and expander expansion during the fabrication of dual-phase alloys.
Journal ArticleDOI
Quantification of the effect of transformation-induced geometrically necessary dislocations on the flow-curve modelling of dual-phase steels
TL;DR: In this paper, the effect of transformation-induced geometrically necessary dislocations (GNDs) on the work-hardening behavior of dual-phase steel was investigated.
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Characterization and modelling of failure initiation in DP steel
TL;DR: In this paper, a microstructure based approach using representative volume elements (RVEs) is utilized to evaluate the micro-structure deformation and the failure initiation on the mesoscale.
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EBSD study of micromechanisms involved in high deformation ability of DP steels
TL;DR: In this paper, microtexture analysis was performed by using an FE-SEM equipped with an EBSD detector and the data were analyzed to quantify orientation gradients within the microstructure of the deformed specimens in terms of Image Quality, Inverse Pole Figure and Taylor Factor map.
References
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Journal ArticleDOI
I and i
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Journal ArticleDOI
The deformation of plastically non-homogeneous materials
TL;DR: The geometrically necessary dislocations as discussed by the authors were introduced to distinguish them from the statistically storages in pure crystals during straining and are responsible for the normal 3-stage hardening.
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Microindentations on W and Mo oriented single crystals: An STM study
TL;DR: In this article, the authors studied micron size indentations of Mo and W single crystals using the scanning tunneling microscopy (STM) and discussed the mechanism of plastic flow and the indentation size effect.
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Effect of martensite distribution on damage behaviour in DP600 dual phase steels
TL;DR: In this paper, the effect of martensite morphology and distribution in a ferrite matrix on the mechanical properties and the damage accumulation in uniaxial tension was investigated in two different automotive-grade dual phase DP600 steels.
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Observations on the fracture of cementite particles in a spheroidized 1.05% c steel deformed at room temperature
TL;DR: In this article, the initiation of fracture in the microstructure at room temperature was observed in tension, compression and torsion, and cracks formed in the carbide particles in a direction normal to the tensile strain imposed upon the particles by the deforming matrix.