Microstructural influence on small fatigue cracks in a ferritic–martensitic steel

Motoyashiki, Yasuko; Brückner‐Foit, A.; Sugeta, Atsushi

doi:10.1016/j.engfracmech.2007.04.019

Cited by 29 publications

(16 citation statements)

References 13 publications

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“…Less strain in martensite and a higher strain in the ferrite during deformation of the DP steels lead to delayed necking and retarded strain to fracture. [5][6][7][8] Previous attempts have been made to quantitatively model the stress and strain partitioning of ferrite and martensite of duplex steel with various numerical or analysis methods. [4,9,10] While those micromechanical models were used to understand the local mechanics of deformation and mechanisms governing the macroscopic elastic-plastic deformation of heterogeneous solids, the real material parameters used for describing the constitutive laws of the representative volume element and matrix are difficult to obtain from experiments.…”

Section: Introductionmentioning

confidence: 99%

Stress and Strain Partitioning of Ferrite and Martensite during Deformation

Cong

Jia

et al. 2009

Metall Mater Trans A

107

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The direct measurement of the stress or strain partitioning during deformation in the materials, consisting of two phases with the same crystallographic structure and different microstructures, is still difficult so far. This is due to the fact that no effective characterization tool is available with the ability to distinguish the local strain and stress at microscale level. In this article, we studied the micromechanical behavior of ferrite/martensite dual-phase (DP) alloys using the in-situ high-energy X-ray diffraction (HEXRD) technique. We established a new method to separate the stress and strain in the ferrite and martensite during loading. Although the ferrite and martensite exhibit the same crystal structure with similar lattice parameters, the dependence of (200) lattice strains on the applied stress is obviously different for each phase. A visco-plastic self-consistent (VPSC) model, which can simulate the micromechanical behavior of two-phase materials, was used to construct the respective constitutive laws for both phases from the experimental lattice strains and to fit the macro-stress-strain curve. The material parameters for each phase extracted from our experiments and simulations could be used for designing other DP alloys and optimizing some complex industrial processes.

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Section: Introductionmentioning

confidence: 99%

Stress and Strain Partitioning of Ferrite and Martensite during Deformation

Cong

Jia

et al. 2009

Metall Mater Trans A

107

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show abstract

“…For example, it was concluded that the hard martensite dispersed in the soft ferrite matrix can significantly influence the fatigue crack growth (FCG) rates [2,7,8]. The FCG rate decreased with an increase in martensite content.…”

Section: Introductionmentioning

confidence: 97%

“…The fatigue properties of dual phase steel have been studied by quite a few researchers [2,[7][8][9][10]. For example, it was concluded that the hard martensite dispersed in the soft ferrite matrix can significantly influence the fatigue crack growth (FCG) rates [2,7,8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and fatigue crack growth behavior in tungsten inert gas welded DP780 dual-phase steel

Kang

Zhu

et al. 2015

Materials & Design

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“…New knowledge can be obtained using a focused ion beam (FIB) milling that can yield three-dimensional information on the size, the shape and the direction of PSBs and PSMs close to the metal surface. FIB has been used to study crack profiles [15], crack shapes in thin copper films [16], crack initiation sites in ferritic-martensitic steel [17,18] and the interaction of microcracks with selected interfaces in nickel-based superalloy [19]. Preliminary information on the structure of PSMs in 316L steel was reported recently [20].…”

Section: Introductionmentioning

confidence: 98%