A model for strain hardening, recovery, recrystallization and grain growth with applications to forming processes of nickel base alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00463985" target="_blank" >RIV/68081723:_____/16:00463985 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.msea.2016.04.015" target="_blank" >http://dx.doi.org/10.1016/j.msea.2016.04.015</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2016.04.015" target="_blank" >10.1016/j.msea.2016.04.015</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A model for strain hardening, recovery, recrystallization and grain growth with applications to forming processes of nickel base alloys

Popis výsledku v původním jazyce

An ensemble of n spherical grains is considered, each of which is characterized by its radius r(i) and by a hardening variable a(i). The hardening variable obeys a Chaboche-type evolution equation with dynamic and static recovery. The grain growth law includes the usual contribution of the grain boundary energy, a term for the stored energy associated with the hardening variable, and the Zener pinning force exerted by particles on the migrating grain boundaries. New grains develop by recrystallization in grains whose stored energy density exceeds a critical value. The growth or shrinkage of the particles, which restrain grain boundary migration, obeys a thermodynamic/kinetic evolution equation. This set of first order differential equations for ri, at and the particle radius is integrated numerically. Fictitious model parameters for a virtual nickel base alloy are used to demonstrate the properties and capabilities of the model. For a real nickel alloy, model parameters are adjusted using measured stress-strain curves, as well as recrystallized volume fractions and grain size distributions. Finally the model with adjusted parameters is applied to a forming process with complex temperature-strain rate histories. (C) 2016 Elsevier B.V. All rights reserved.

Název v anglickém jazyce

A model for strain hardening, recovery, recrystallization and grain growth with applications to forming processes of nickel base alloys

Popis výsledku anglicky

An ensemble of n spherical grains is considered, each of which is characterized by its radius r(i) and by a hardening variable a(i). The hardening variable obeys a Chaboche-type evolution equation with dynamic and static recovery. The grain growth law includes the usual contribution of the grain boundary energy, a term for the stored energy associated with the hardening variable, and the Zener pinning force exerted by particles on the migrating grain boundaries. New grains develop by recrystallization in grains whose stored energy density exceeds a critical value. The growth or shrinkage of the particles, which restrain grain boundary migration, obeys a thermodynamic/kinetic evolution equation. This set of first order differential equations for ri, at and the particle radius is integrated numerically. Fictitious model parameters for a virtual nickel base alloy are used to demonstrate the properties and capabilities of the model. For a real nickel alloy, model parameters are adjusted using measured stress-strain curves, as well as recrystallized volume fractions and grain size distributions. Finally the model with adjusted parameters is applied to a forming process with complex temperature-strain rate histories. (C) 2016 Elsevier B.V. All rights reserved.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BJ - Termodynamika

OECD FORD obor

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Projekt

<a href="/cs/project/GA14-24252S" target="_blank" >GA14-24252S: Příprava a optimalizace creepu odolných kompozitů s Fe-Al matricí a částicemi Al2O3 s submikronovou strukturou</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Science and Engineering A-Structural materials

ISSN

0921-5093

e-ISSN

—

Svazek periodika

665

Číslo periodika v rámci svazku

MAY

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

9

Strana od-do

175-183

Kód UT WoS článku

000376788000020

EID výsledku v databázi Scopus

2-s2.0-84963819676