A macro- and micromechanics investigation of hot cracking in duplex steels

Martin, Guilhem; Yerra, Sampath Kumar; Bréchet, Y.; Véron, M.; Mithieux, Jean‐Denis; Chéhab, B.; Delannay, Laurent; Pardoen, Thomas

doi:10.1016/j.actamat.2012.03.040

Cited by 46 publications

(16 citation statements)

References 38 publications

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“…By assuming plastic incompressibility and neglecting the strain component in the normal direction, the equivalent plastic strain at each region was estimated by Eq. (1) [17];…”

Section: Methodsmentioning

confidence: 99%

EBSD study of micromechanisms involved in high deformation ability of DP steels

et al. 2015

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“…By assuming plastic incompressibility and neglecting the strain component in the normal direction, the equivalent plastic strain at each region was estimated by Eq. (1) [17];…”

Section: Methodsmentioning

confidence: 99%

EBSD study of micromechanisms involved in high deformation ability of DP steels

et al. 2015

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“…DIC was performed using CMV software [27,28]. For a more detailed description of the DIC routine applied here, the reader is referred to Martin et al [29,30] and Lechartier et al [31] In order to determine the strain partitioning between α and α′-martensite, the strain map had to be related to the underlying microstructure. The SE-images were subdi vided in subsets of 60 × 60 pixels, i.e.…”

Section: Methodsmentioning

confidence: 99%

Micromechanical behavior and thermal stability of a dual-phase α+α’ titanium alloy produced by additive manufacturing

et al. 2019

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In order to improve the tensile properties of additively manufactured Ti 6Al 4V parts, specific heat treatments have been developed. Previous work demonstrated that a sub-transus thermal treatment at 920°C followed by water quenching generates a dual-phase α+α′ microstructure with a high work-hardening capacity inducing a desirable increase in both strength and ductility. The present study investigates the micromechanical behavior of this α+α′ material as well as the thermal stability of the metastable α' martensite. To that end, annealing of the α+α′ microstructure is performed and the resulting microstructural evolution is analyzed, along with its impact on the tensile properties. A deeper understanding of the micromechanics of the multiphase microstructure both before and after annealing is achieved by performing in-situ tensile testing within a SEM, together with digital image correlation for full-field local strain measurements. This approach allows the strain partitioning to be quantified at a microscale and highlights a significant mechanical contrast between the two phases. In the α+α′ microstructure, the α′ phase is softer than the α phase, which is confirmed by nanoindentation measurements. Partial decomposition of the martensite during annealing induces a substantial hardening of the α′ phase, which is attributed to fine-scale precipitation and solution strengthening. A scale transition model based on the iso-work assumption and describing the macroscopic tensile behavior of the material depending on the individual mechanical behavior of each phase is also proposed. This model enables to provide insights into the underlying deformation and work-hardening mechanisms.

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“…Voids features were examined in each region by image analysis of SEM micrographs. By assuming plastic incompressibility and neglecting the strain component in the normal direction, direction perpendicular to the specimen surface, the equivalent plastic strain in each region was estimated as [38]:…”

Section: Methodsmentioning

confidence: 99%