Strain rate sensitivity and evolution of dislocations and twins in a twinning-induced plasticity steel

Liang, Z.Y.; Wang, X.; Huang, Wenke; Huang, Mingxin

doi:10.1016/j.actamat.2015.01.013

Cited by 157 publications

(62 citation statements)

References 52 publications

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“…19 Besides, twin boundaries can also enhance the workhardening rate by reducing dislocation mean free path. 19,[24][25][26][27] Experimental measurements [28][29][30][31] of the dislocation density by X-ray diffraction and line profile analysis reveal that the dislocation density of TWIP steels at fracture (with a true strain of 0?4-0?5) is usually in the order of 10 15 m…”

Section: Deformation Mechanismmentioning

confidence: 99%

“…23,39 A lower SFE should suppress the dislocation annihilation, which leads to a more effective accumulation of dislocations during plastic deformation and higher workhardening rate. 23,29 In addition, SFE also has the effect on the interaction between the carbon atoms and the stacking faults, which may explain the suppression of dynamic strain ageing by the addition of Al. 47 For the interaction between partial dislocations and carbides via Orowan mechanism, a higher SFE can effectively increase the critical stress for the bypassing process.…”

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confidence: 99%

“…40 The dislocation cross-slip is strongly inhibited by such extended dislocation core unless this extended core is constricted by external force with the assistance of thermal activation. 39,41 Therefore, dislocations in TWIP steels prefer planar slip, which leads to the formation of planar dislocation structures (such as highly dense dislocation walls 10,42 at small strain and tangle structure at large strain 29,[43][44][45] ) instead of the heterogeneous cell structure developed by wavy slip in face centred cubic metals with high SFE. With dislocation annihilation suppressed by the resistance to cross-slip, dislocation multiplication in TWIP steels may contribute significantly to the workhardening rate even in the absence of twinning.…”

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confidence: 99%

“…54,55 Otherwise, if the mobile carbon atoms cannot follow dislocations, the dislocations will move in a jerky fashion by overcoming these carbon induced obstacles with thermal activation, 56 which will lead to the positive strain rate sensitivity. 29,[57][58][59][60][61][62] The chemical composition, 47 Microalloying elements including Ti, Nb and V have been be utilised to form nanometre sized carbides in the austenitic matrix by thermomechanical processing, e.g. cold rolling followed by controlled heat treatment.…”

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confidence: 99%

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Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

Huang

Liang

Luo

2015

Materials Science and Technology

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Manganese rich austenitic twinning induced plasticity steels with high strength and high ductility have been developed in 1990s as promising candidates for automotive applications. Tremendous efforts have therefore been made to explore the unusual deformation and failure mechanisms of these alloys. We provide here a critical assessment of the recent progress in understanding their deformation and failure mechanisms and discuss some scientific challenges that remain unresolved, for example, a physically based twinning kinetics model.

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Section: Deformation Mechanismmentioning

confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

Huang

Liang

Luo

2015

Materials Science and Technology

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“…To quantitatively analyse the hardening effects of the dislocation forests on the deformations at 573K and 873K, Δσ ρ , the flow stress contribution can be expressed as [295,296]:…”

Section: Strain Hardening Behaviour At 573k and 873kmentioning

confidence: 99%

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

Zhan¹

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Titanium and its alloys fulfil a wide range of applications involving aerospace, biomedical, chemical and petroleum industries due to their extraordinary properties such as high specific strength, excellent biocompatibility and corrosion resistance. Among different types of titanium alloys, β titanium alloys have a unique range of properties such as an excellent combination of high strength and fracture toughness and low Young's modulus. Therefore, the usage of β titanium alloys in the manufacturing of some key components in aerospace and biomedical industries has continually increased in the past decade.Nowadays many commercial manufacturing processes for metallic materials such as machining, explosive welding, hot forging and extrusion employ high strain rates and are conducted at elevated temperatures. Also, high-strain-rate deformation can be encountered in collisions such as in car crashes, bird strikes on airplanes and micrometeorite impacts on space structures. Hence a large number of studies have been conducted on the dynamic response of metallic materials including copper, steels, tantalum, Ti-6Al-4V alloy and commercially pure titanium to high strain rates. Due to limited knowledge of the dynamic behaviour of β titanium alloys, this thesis mainly investigates the stress-strain behaviour and microstructural evolution of β titanium alloys under high strain rates at room and elevated temperatures.Split Hopkinson Pressure Bar compressive tests were carried out on two new types of β titanium alloys with different levels of β phase stability, the Ti-6Cr-5Mo-5V-4Al (wt. %) and Ti-25Nb-3Zr-3Mo-2Sn (wt.%) alloys, at strain rates ranging from 10 -3 s -1 to 10 4 s -1 and temperatures ranging from 293K to 1173K. The Ti-6Cr-5Mo-5V-4Al alloy, with relatively high β phase stability, represents an alloy type which can be engineered through heat treatment or thermo-mechanical processing to achieve a superior combination of strength and fracture toughness. While the Ti-25Nb-3Zr-3Mo-2Sn alloy with relatively low β phase stability represents an alloy type which can be applied in biomedical applications due to their low Young's modulus and superelastic properties.For the Ti-6Cr-5Mo-5V-4Al alloy, dislocation slip is dominant at all testing strain rates and temperatures in this research. The flow stress increases with increasing strain rate but decreasing temperature. Also, it is more sensitive to temperature than strain rate. At ambient temperatures, the strain hardening rate exhibited by the Ti-6Cr-5Mo-5V-4Al alloy at high strain rates is much lower than that at quasi-static strain rates, which is attributed to the thermal softening effect brought byHongyi Zhan II The University of Queensland adiabatic heating. While for the Ti-25Nb-3Zr-3Mo-2Sn alloy, multiple deformation mechanisms including dislocation slip, {332} <113> and {112} <111> mechanical twinning, stress-induced martensitic α" and ω phase transformations can be activated simultaneously and among them {332} <113> twinning is dominant at 293K regardless of...

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The Role of Transformation‐Induced Plasticity in the Development of Advanced High Strength Steels

Liu

Huang

2018

Adv Eng Mater

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Lightweight structural components made of advanced high-strength steels (AHSSs) in the automotive industry can substantially reduce greenhouse gas emissions. The 3rd-generation AHSSs, which consist of medium Mn steel, quenching and partitioning (Q&P) steel, and carbide-free bainitic (CFB) steel, is the current research focus of the steel community. In particular, the retained austenite grains are the intrinsic components of the 3rd-generation AHSSs. These retained austenite grains can demonstrate a transformationinduced plasticity (TRIP) effect by transforming into martensite during mechanical loading, improving the strain-hardening behavior of AHSSs. Consequently, intensive research has been carried out over the past 30 years to understand the role of the TRIP effect on the development of AHSSs. Therefore, this review article is aimed to provide a state-of-the-art summary of recent progress on AHSSs with the TRIP effect. Specifically, the processing, the relationship between microstructure and mechanical properties, and the potential industrial applications of TRIP-enabled AHSSs will be addressed in this review. More importantly, the mechanical stability of the retained austenite grains, which determines the overall performance of the TRIP effect in AHSSs, will be discussed by considering several governing factors.

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Strain rate sensitivity and evolution of dislocations and twins in a twinning-induced plasticity steel

Cited by 157 publications

References 52 publications

Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

The Role of Transformation‐Induced Plasticity in the Development of Advanced High Strength Steels

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