Bone-like crack resistance in hierarchical metastable nanolaminate steels

Koyama, Motomichi; Zhang, Zhao; Wang, Meimei; Ponge, Dirk; Raabe, Dierk; Tsuzaki, Kaneaki; Noguchi, Hiroshi; Taşan, Cemal Cem

doi:10.1126/science.aal2766

Cited by 330 publications

(145 citation statements)

References 40 publications

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“…It has been recognized that fatigue crack roughness causes roughness-induced crack closure, decelerating the fatigue crack growth rate significantly. [81][82][83] Therefore, the occurrence of DSA can decelerate fatigue crack growth via the formation of crack roughnessses. 84) In summary, the DSA plays dual roles in the improvement of fatigue crack resistance, i.e., local hardening at the crack tip, and the deflection of crack growth path.…”

Section: Effects On Fatigue Strength: Crack Non-propagation and Crackmentioning

confidence: 99%

Overview of Dynamic Strain Aging and Associated Phenomena in Fe–Mn–C Austenitic Steels

2018

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This paper presents an overview of the recent works on dynamic strain aging (DSA) of Fe-Mn-C austenitic steels including Hadfield and twinning-induced plasticity (TWIP) steels. First, a model of the DSA mechanism and its controlling factors are briefly explained in terms of Mn-C coupling and dislocation separation. Then, we introduce the effects of DSA on mechanical properties such as work hardening capability, uniform elongation, post-uniform elongation, and fatigue strength. Specifically, we note (1) the pinning effect on extended dislocation for the work hardening, (2) the Poretvin-Le Chatelier banding effect on damage evolution for the tensile elongation, and (3) the crack tip hardening/softening effect on crack resistance for the fatigue strength. We believe that this overview will help in designing advanced highstrength steels with superior ductility and fatigue resistance.

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Section: Effects On Fatigue Strength: Crack Non-propagation and Crackmentioning

confidence: 99%

Overview of Dynamic Strain Aging and Associated Phenomena in Fe–Mn–C Austenitic Steels

2018

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“…The alloy consists of a hierarchical structure comparable to bone, composed of laminate-arranged martensite and metastable austenite phases, and showed improved fatigue resistance compared to conventional high strength alloys as for example DP steels [21][22][23]. The formation of localized compressive stress fields, which were created from the volume-expanding deformation-induced phase transformation from the metastable face centered cubic γ phase into the near body centered cubic α'-martensite at crack tips, was observed to suppress crack nucleation and crack propagation, figure 9 [24].…”

Section: Figurementioning

confidence: 99%

“…Bone like fatigue resistance observed in a nano-laminate martensite-austenite steel. The figures and data have been taken from the work of Koyama et al [24].…”

Section: Figurementioning

confidence: 99%

1 billion tons of nanostructure – segregation engineering enables confined transformation effects at lattice defects in steels

Raabe

Ponge

Wang

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The microstructure of complex steels can be manipulated by utilising the interaction between the local mechanical distortions associated with lattice defects, such as dislocations and grain boundaries, and solute components that segregate to them. Phenomenologically these phenomena can be interpreted in terms of the classical Gibbs adsorption isotherm, which states that the total system energy can be reduced by removing solute atoms from the bulk and segregating them at lattice defects. Here we show how this principle can be utilised through appropriate heat treatments not only to enrich lattice defects by solute atoms, but also to further change these decorated regions into confined ordered structural states or even to trigger localized decomposition and phase transformations. This principle, which is based on the interplay between the structure and mechanics of lattice defects on the one hand and the chemistry of the alloy's solute components on the other hand, is referred to as segregation engineering. In this concept solute decoration to specific microstructural traps, viz. lattice defects, is not taken as an undesired effect, but instead seen as a tool for manipulating specific lattice defect structures, compositions and properties that lead to beneficial material behavior. Owing to the fairly well established underlying thermodynamic and kinetic principles, such local decoration and transformation effects can be tuned to proceed in a self-organised manner by adjusting (i) the heat treatment temperatures for matching the desired trapping, transformation or reversion regimes, and (ii) the corresponding timescales for sufficient solute diffusion to the targeted defects. Here we show how this segregation engineering principle can be applied to design selforganized nano-and microstructures in complex steels for improving their mechanical properties.

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“…This is well represented, for example, by wood and bone; both materials feature a fibrous structure at the nanoscale with fibers of varying orientations arranged in a lamellar fashion despite their distinctly different chemical compositions . Natural materials have long been recognized as a source of inspiration for new engineering materials with their architectures being increasingly replicated in man‐made systems to obtain improved performance . To this end, it is of significance to extract the common principles of architectural designs among diverse biological materials from the viewpoint of materials science and mechanics—it is essentially these principles that need to be reproduced and that we should learn from nature.…”

Section: Introductionmentioning

confidence: 99%

Structural Orientation and Anisotropy in Biological Materials: Functional Designs and Mechanics

Liu

Zhang

Ritchie

2020

Adv Funct Materials

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Biological materials exhibit anisotropic characteristics because of the anisometric nature of their constituents and their preferred alignment within interfacial matrices. The regulation of structural orientations is the basis for material designs in nature and may offer inspiration for man‐made materials. Here, how structural orientation and anisotropy are designed into biological materials to achieve diverse functionalities is revisited. The orientation dependencies of differing mechanical properties are introduced based on a 2D composite model with wood and bone as examples; as such, anisotropic architectures and their roles in property optimization in biological systems are elucidated. Biological structural orientations are designed to achieve extrinsic toughening via complicated cracking paths, robust and releasable adhesion from anisotropic contact, programmable dynamic response by controlled expansion, enhanced contact damage resistance from varying orientations, and simultaneous optimization of multiple properties by adaptive structural reorientation. The underlying mechanics and material‐design principles that could be reproduced in man‐made systems are highlighted. Finally, the potential and challenges in developing a better understanding to implement such natural designs of structural orientation and anisotropy are discussed in light of current advances. The translation of these biological design principles can promote the creation of new synthetic materials with unprecedented properties and functionalities.

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Bone-like crack resistance in hierarchical metastable nanolaminate steels

Cited by 330 publications

References 40 publications

Overview of Dynamic Strain Aging and Associated Phenomena in Fe–Mn–C Austenitic Steels

Overview of Dynamic Strain Aging and Associated Phenomena in Fe–Mn–C Austenitic Steels

1 billion tons of nanostructure – segregation engineering enables confined transformation effects at lattice defects in steels

Structural Orientation and Anisotropy in Biological Materials: Functional Designs and Mechanics

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