A generic stress–strain model for metallic materials with two-stage strain hardening behaviour

The forming performance of an as-quenched (W temper) novel aluminum-lithium alloy was investigated to realize a rapid and efficient forming through the route of "solution-forming after quenching-aging". Tensile test was mainly adopted to obtain the true stress-strain curves, which were applied to calculate the strain hardening index (n value) and plastic strain ratio (r value). The results revealed that the investigated alloy displayed the satisfied forming properties in as-quenched condition. The Portevin-Le Chatelier (PLC) bands during the tensile deformation were observed within 60 min after quenching. Moreover, the n values were isotropic at different directions, decreasing rapidly with the extension of natural aging time. Meanwhile, the r values, rarely influenced by natural aging behavior, exhibited a significant anisotropy.

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“…Meanwhile, the strain hardening index (n value) was acquired through curve fitting with the model of exponential hardening [16], shown in Eq. 1.…”

Section: Methodsmentioning

confidence: 99%

Forming performance of an as-quenched novel aluminum-lithium alloy

Guo

Wang

et al. 2014

Int J Adv Manuf Technol

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“…Different approaches are available to model the plastic deformation. The constitutive models to simulate the plastic deformation, such as the power law [36,37,96,100] and hyperbolic sine law [56,95,99], require model parameters that capture the strain hardening behavior of the alloy. After fitting the experimental data, the effects from material chemistry, geometry, and testing conditions are no longer distinguished by the model parameters, and, therefore, the trained models can only be used under specific conditions.…”

Section: Plastic Deformationmentioning

confidence: 99%

A Computational Framework for Material Design

Kattner

Campbell

2017

Integr Mater Manuf Innov

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A computational framework is proposed that enables the integration of experimental and computational data, a variety of user-selected models, and a computer algorithm to direct a design optimization. To demonstrate this framework, a sample design of a ternary Ni-Al-Cr alloy with a high work-to-necking ratio is presented. This design example illustrates how CALPHAD phase-based, composition and temperature-dependent phase equilibria calculations and precipitation models are coupled with models for elastic and plastic deformation to calculate the stress-strain curves. A genetic algorithm then directs the search within a specific set of composition and processing constraints for the ideal composition and processing profile to optimize the mechanical properties. The initial demonstration of the framework provides a potential solution to initiate the material design process in a large space of composition and processing conditions. This framework can also be used in similar material systems or adapted for other material classes.Keywords Ni-based superalloy · Integrated computational materials engineering · Genetic algorithm · Material design

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“…As a consequence, a deeper understanding of the pipe strain capacity is a fundamental aspect to be discussed. High strength line pipe steels belong to the large category of metals that exhibit two stages of strain hardening (also called 'double-n' behaviour) [8]. An accurate description and determination of this stress-strain behaviour and the toughness properties of line pipe steels is a key point in performing a strain based assessment [1,7].…”

Section: Line Pipe Steel Mechanical Properties For Strain-based Desigmentioning

confidence: 99%

Latest developments in mechanical properties and metallurgical features of high strength line pipe steels

Rosado¹,

Waele²,

Vanderschueren³

et al. 2013

SCAD

Self Cite

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Abstract:In response to the increasing demand to improve both transportation efficiency and performance, the steel pipe industry has conducted extensive efforts to develop line pipe steel grades with superior metallurgical and mechanical (strength, toughness and ductility) properties in order to allow exploitation in hostile environments. This paper aims to give an overview of recent developments of high strength pipe steel grades as API 5L X70 and beyond, providing a detailed understanding of the continuous improvements with respect to a strain-based design context. Information regarding the metallurgy and processing, such as chemical composition, microstructural design, thermo-mechanical controlled process (TMCP) and accelerated cooling process (AcC), to achieve the target strength, ductility and toughness properties are discussed.

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A generic stress–strain model for metallic materials with two-stage strain hardening behaviour

Cited by 69 publications

References 34 publications

Forming performance of an as-quenched novel aluminum-lithium alloy

Forming performance of an as-quenched novel aluminum-lithium alloy

A Computational Framework for Material Design

Latest developments in mechanical properties and metallurgical features of high strength line pipe steels

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