A Microstructure Based Model for the Mechanical Behavior of Multiphase Steels

Kok, Piet; Spanjer, W.; Vegter, H.

doi:10.4028/www.scientific.net/kem.651-653.975

Cited by 12 publications

(7 citation statements)

References 5 publications

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“…A substantial number of numerical methods exists to generate suited RVE morphologies for a wide range of material classes, [460][461][462][463] although most of the more systematic applications have been devoted to the study of microstructure-property relationships of DP steels [34,36,[464][465][466][467][468] In RVE studies, the most relevant feature is the martensite volume fraction. [3] In addition to the rather straightforward consideration of this descriptor in such simulations, the topological arrangement of the martensite phase can also be adjusted and thus subjected to systematic simulation studies.…”

Section: B Representative Volume Element Simulations Of Microstructumentioning

confidence: 99%

Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels

Raabe

Sun

Silva

et al. 2020

Metall Mater Trans A

151

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This is a viewpoint paper on recent progress in the understanding of the microstructure–property relations of advanced high-strength steels (AHSS). These alloys constitute a class of high-strength, formable steels that are designed mainly as sheet products for the transportation sector. AHSS have often very complex and hierarchical microstructures consisting of ferrite, austenite, bainite, or martensite matrix or of duplex or even multiphase mixtures of these constituents, sometimes enriched with precipitates. This complexity makes it challenging to establish reliable and mechanism-based microstructure–property relationships. A number of excellent studies already exist about the different types of AHSS (such as dual-phase steels, complex phase steels, transformation-induced plasticity steels, twinning-induced plasticity steels, bainitic steels, quenching and partitioning steels, press hardening steels, etc.) and several overviews appeared in which their engineering features related to mechanical properties and forming were discussed. This article reviews recent progress in the understanding of microstructures and alloy design in this field, placing particular attention on the deformation and strain hardening mechanisms of Mn-containing steels that utilize complex dislocation substructures, nanoscale precipitation patterns, deformation-driven transformation, and twinning effects. Recent developments on microalloyed nanoprecipitation hardened and press hardening steels are also reviewed. Besides providing a critical discussion of their microstructures and properties, vital features such as their resistance to hydrogen embrittlement and damage formation are also evaluated. We also present latest progress in advanced characterization and modeling techniques applied to AHSS. Finally, emerging topics such as machine learning, through-process simulation, and additive manufacturing of AHSS are discussed. The aim of this viewpoint is to identify similarities in the deformation and damage mechanisms among these various types of advanced steels and to use these observations for their further development and maturation.

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Section: B Representative Volume Element Simulations Of Microstructumentioning

confidence: 99%

Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels

Raabe

Sun

Silva

et al. 2020

Metall Mater Trans A

151

View full text Add to dashboard Cite

show abstract

“…Their use in microstructure characterization is not fully evaluated yet. Therefore, we want to test their applicability and then extend our work to more general and less understood Voronoi structures, such as Multi-level Voronoi diagrams [20] or Laguerre-Voronoi tessellations [21] in which the convenient scaling properties present in the Poisson-Voronoi diagrams are less obvious.…”

Section: Resultsmentioning

confidence: 99%

Accurate representation of the distributions of the 3D Poisson-Voronoi typical cell geometrical features

Vittorietti

Kok

Sietsma

et al. 2019

Computational Materials Science

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Although Poisson-Voronoi diagrams have interesting mathematical properties, there is still much to discover about the geometrical properties of its grains. Through simulations, many authors were able to obtain numerical approximations of the moments of the distributions of more or less all geometrical characteristics of the grain. Furthermore, many proposals on how to get close parametric approximations to the real distributions were put forward by several authors. In this paper we show that exploiting the scaling property of the underlying Poisson process, we are able to derive the distribution of the main geometrical features of the grain for every value of the intensity parameter. Moreover, we use a sophisticated simulation program to construct a close Monte Carlo based approximation for the distributions of interest. Using this, we also determine the closest approximating distributions within the mentioned frequently used parametric classes of distributions and conclude that these approximations can be quite accurate.

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“…The basic principle of the technique is based on regrouping fine Voronoi structures by using a coarser tessellation depending on location of the seed points of fine Voronoi cells. The reader may refer to the works of Kok et al [57] and Yadegari et al [58] for more detailed explanations on the multilevel Voronoi approach, as well as the possibilities it presents in microstructure generation. The MLV software generates output files, that contain geometrical and orientation information to create microstructures.…”

Section: Microstructurementioning

confidence: 99%

An RVE-Based Study of the Effect of Martensite Banding on Damage Evolution in Dual Phase Steels

2020

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The intent of this work is to numerically investigate the effect of second phase morphology on damage evolution characteristics of dual-phase (DP) steels. A strain gradient enhanced crystal plasticity framework is used in order to capture the deformation heterogeneity caused by lattice orientations and microstructural size effects. The investigation is focused on two different martensite distributions (banded and random) that are relevant for industrial applications. The effects of martensite morphology are compared by artificially generated 2D plane strain microstructures with initial void content. The Representative volume elements (RVEs) are subjected to tensile deformation imposed by periodic boundary conditions. Evolution of voids are analyzed individually as well as a whole and characterized with respect to average axial strain. It is found that during stretching voids exhibit varying evolution characteristics due to generation of inhomogeneous strain fields within the structure. The behavior of individual voids shows that the stress-state surrounding the void is different from the imposed far field macroscopic stress-state. The voids at the ferrite martensite interface and in ferrite grains of the randomly distributed martensite grow more than in the banded structure. On the other hand, voids formed by martensite cracking growth shows an opposite trend.

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A Microstructure Based Model for the Mechanical Behavior of Multiphase Steels

Cited by 12 publications

References 5 publications

Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels

Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels

Accurate representation of the distributions of the 3D Poisson-Voronoi typical cell geometrical features

An RVE-Based Study of the Effect of Martensite Banding on Damage Evolution in Dual Phase Steels

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