Damage evolution in TWIP and standard austenitic steel by means of 3D X ray tomography

Fabrègue, Damien; Landron, Caroline; Bouaziz, Olivier; Maire, Éric

doi:10.1016/j.msea.2013.05.013

Cited by 52 publications

(32 citation statements)

References 20 publications

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“…They revealed that the samples which have a higher value of stress triaxiality show a higher value of nucleation, and the nucleation in the soft matrix such as pure ferrite was particularly low. Fabregue et al 9) also carried out comparative study on the damage evolution in two homogeneous steels. Four serial studies on the nucleation mentioned above, however, were concentrated on the nucleation by decohesion at the interfaces between dual phases or at grain boundaries without considering the effect of the inclusions or the particles which are regarded as having a predominant role in the damage evolution.…”

Section: In Situ Observation Of Void Nucleation and Growth In A Steelmentioning

confidence: 99%

“…This model has been demonstrated good agreement on various types of steels and extended by subsequent studies to take into account the shape change of voids in tensile and transverse directions using a finite number of voids in different types of steels such as austenitic, ferritic and martensitic matrices. 9,18) Most studies mentioned above are limited to the inclusion-free or unconsidered, 10,12,13,18) the homogeneous 9) and the model materials embedding artificial damages 6,7,19,20) for easy estimation. Concerning the complexity of damage evolution leading to a ductile fracture, the artificial voids have been employed in many studies to simplify the analysis of damage evolution.…”

Section: )mentioning

confidence: 99%

“…It shows yield strength of 482.3 MPa and then exhibits a relatively low strain hardening up to maximum strength compared to other steel grades such as austenitic 316 L steel. 9) The fracture surface of the specimen was also observed using SEM and represented a typical ductile fracture with many dimples of different sizes surrounding broken inclusions, as shown in Fig. 5.…”

Section: Tensile Behavior and Triaxialitymentioning

confidence: 99%

“…It is often used in the tomographic study as a first-order estimation of the triaxiality regardless of the specimen geometries, e.g., cylindrical bars, 5,8,12,18) flat ones, 6,7,9,10,13,19,20) even at notched ones. 5,8,13,18,20) The Bridgman formula, however, is only valid for an axisymmetric geometry.…”

Section: )mentioning

confidence: 99%

“…With technological advances in hardware and software of X-ray tomography technique, this final phenomenon can be clearly observed during in situ tensile test, [5][6][7] as well as the first and the second stages. 8,9) Recently, many experimental and modeling efforts with X-ray tomography have been made to better understand and predict the void nucleation in steels as well as light metals such as aluminum alloys which can be more clearly observed due to their higher X-ray transmissivity than steels. Maire et al 10) measured the number of voids per unit volume in a dual-phase steel during in situ tensile test.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Observation of Void Nucleation and Growth in a Steel using X-ray Tomography

et al. 2015

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Section: In Situ Observation Of Void Nucleation and Growth In A Steelmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Tensile Behavior and Triaxialitymentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In Situ Observation of Void Nucleation and Growth in a Steel using X-ray Tomography

et al. 2015

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Mechanical Properties and Tensile Fracture Mechanisms of Fe–Mn–(Al, Si) TRIP/TWIP Steels with Different Ferrite Volume Fractions

et al. 2015

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The mechanical properties, damage, and fracture behaviors of Fe-Mn-(Al, Si) steels containing different Mn content and volume fraction of ferrite have been investigated through tensile testing. It is found that the volume fraction of ferrite has significant influences on the mechanical properties and damage accumulation. With increasing the Mn content, both the yield strength and ultimate tensile strength are decreased, while the uniform elongation is continuously increased, showing a typical trade-off relation between strength and elongation. The difference in the work-hardening behavior can be attributed to the increase in the stacking fault energy (SFE) caused by the addition of Mn. The failure mechanisms of the steels are found to be mainly influenced by deformation localization due to microstructural inhomogeneity. On the one hand, the Fe-Mn-(Al, Si) steel with a much more uniform distribution of austenite shows a slower rate of damage growth and a continuous void nucleation during the deformation process, resulting in a higher void density prior to the final fracture. On the other hand, the Fe-Mn-(Al, Si) steel with more ferrite exhibits accelerated void growth and catastrophic coalescence.

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Specimen preparation by ion beam slope cutting for characterization of ductile damage by scanning electron microscopy

Besserer

Gerstein

Maier

et al. 2016

Microscopy Res & Technique

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To investigate ductile damage in parts made by cold sheet-bulk metal forming a suited specimen preparation is required to observe the microstructure and defects such as voids by electron microscopy. By means of ion beam slope cutting both a targeted material removal can be applied and mechanical or thermal influences during preparation avoided. In combination with scanning electron microscopy this method allows to examine voids in the submicron range and thus to analyze early stages of ductile damage. In addition, a relief structure is formed by the selectivity of the ion bombardment, which depends on grain orientation and microstructural defects. The formation of these relief structures is studied using scanning electron microscopy and electron backscatter diffraction and the use of this side effect to interpret the microstructural mechanisms of voids formation by plastic deformation is discussed. A comprehensive investigation of the suitability of ion beam milling to analyze ductile damage is given at the examples of a ferritic deep drawing steel and a dual phase steel.

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Damage evolution in TWIP and standard austenitic steel by means of 3D X ray tomography

Cited by 52 publications

References 20 publications

In Situ Observation of Void Nucleation and Growth in a Steel using X-ray Tomography

In Situ Observation of Void Nucleation and Growth in a Steel using X-ray Tomography

Mechanical Properties and Tensile Fracture Mechanisms of Fe–Mn–(Al, Si) TRIP/TWIP Steels with Different Ferrite Volume Fractions

Specimen preparation by ion beam slope cutting for characterization of ductile damage by scanning electron microscopy

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