Discrete dislocation modeling of stress corrosion cracking in an iron

Ilaksh Adlakha, Kuntimaddi Sadananda, Kiran Solanki

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Material strengthening and embrittlement are controlled by interactions between dislocations and hydrogen that alter the observed deformation mechanisms. In this work, we used an energetics approach to differentiate two fundamental stress corrosion mechanisms in iron, namely, hydrogen-enhanced localized plasticity and hydrogen-enhanced decohesion. Considering the small-scale yielding condition, we use a discrete dislocation framework with line dislocations to simulate the crack-tip plastic behavior. The crack growth was modeled using the change in surface energies (cohesive zone laws) due to hydrogen segregation. The changes in the surface energies as a function of hydrogen concentration are computed using atomistic simulations. Results indicate that, when hydrogen concentrations are low, crack growth occurs by alternating mechanisms of cleavage and slip. However, as the hydrogen concentrations increased above some critical value, the crack grows predominately by the cleavage-based decohesion process.

Original languageEnglish (US)
Pages (from-to)467-475
Number of pages9
JournalCorrosion Reviews
Volume33
Issue number6
DOIs
StatePublished - Nov 1 2015

Fingerprint

Stress corrosion cracking
Hydrogen
Iron
Interfacial energy
Crack propagation
Strengthening (metal)
Embrittlement
Crack tips
Plasticity
Corrosion
Plastics
Cracks

Keywords

  • cleavage
  • discrete dislocation
  • dislocation
  • hydrogen embrittlement

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Discrete dislocation modeling of stress corrosion cracking in an iron. / Adlakha, Ilaksh; Sadananda, Kuntimaddi; Solanki, Kiran.

In: Corrosion Reviews, Vol. 33, No. 6, 01.11.2015, p. 467-475.

Research output: Contribution to journalArticle

Adlakha, Ilaksh ; Sadananda, Kuntimaddi ; Solanki, Kiran. / Discrete dislocation modeling of stress corrosion cracking in an iron. In: Corrosion Reviews. 2015 ; Vol. 33, No. 6. pp. 467-475.
@article{004badd26f124edea5588d86fbc830b3,
title = "Discrete dislocation modeling of stress corrosion cracking in an iron",
abstract = "Material strengthening and embrittlement are controlled by interactions between dislocations and hydrogen that alter the observed deformation mechanisms. In this work, we used an energetics approach to differentiate two fundamental stress corrosion mechanisms in iron, namely, hydrogen-enhanced localized plasticity and hydrogen-enhanced decohesion. Considering the small-scale yielding condition, we use a discrete dislocation framework with line dislocations to simulate the crack-tip plastic behavior. The crack growth was modeled using the change in surface energies (cohesive zone laws) due to hydrogen segregation. The changes in the surface energies as a function of hydrogen concentration are computed using atomistic simulations. Results indicate that, when hydrogen concentrations are low, crack growth occurs by alternating mechanisms of cleavage and slip. However, as the hydrogen concentrations increased above some critical value, the crack grows predominately by the cleavage-based decohesion process.",
keywords = "cleavage, discrete dislocation, dislocation, hydrogen embrittlement",
author = "Ilaksh Adlakha and Kuntimaddi Sadananda and Kiran Solanki",
year = "2015",
month = "11",
day = "1",
doi = "10.1515/corrrev-2015-0068",
language = "English (US)",
volume = "33",
pages = "467--475",
journal = "Corrosion Reviews",
issn = "0334-6005",
publisher = "Freund Publishing House Ltd",
number = "6",

}

TY - JOUR

T1 - Discrete dislocation modeling of stress corrosion cracking in an iron

AU - Adlakha, Ilaksh

AU - Sadananda, Kuntimaddi

AU - Solanki, Kiran

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Material strengthening and embrittlement are controlled by interactions between dislocations and hydrogen that alter the observed deformation mechanisms. In this work, we used an energetics approach to differentiate two fundamental stress corrosion mechanisms in iron, namely, hydrogen-enhanced localized plasticity and hydrogen-enhanced decohesion. Considering the small-scale yielding condition, we use a discrete dislocation framework with line dislocations to simulate the crack-tip plastic behavior. The crack growth was modeled using the change in surface energies (cohesive zone laws) due to hydrogen segregation. The changes in the surface energies as a function of hydrogen concentration are computed using atomistic simulations. Results indicate that, when hydrogen concentrations are low, crack growth occurs by alternating mechanisms of cleavage and slip. However, as the hydrogen concentrations increased above some critical value, the crack grows predominately by the cleavage-based decohesion process.

AB - Material strengthening and embrittlement are controlled by interactions between dislocations and hydrogen that alter the observed deformation mechanisms. In this work, we used an energetics approach to differentiate two fundamental stress corrosion mechanisms in iron, namely, hydrogen-enhanced localized plasticity and hydrogen-enhanced decohesion. Considering the small-scale yielding condition, we use a discrete dislocation framework with line dislocations to simulate the crack-tip plastic behavior. The crack growth was modeled using the change in surface energies (cohesive zone laws) due to hydrogen segregation. The changes in the surface energies as a function of hydrogen concentration are computed using atomistic simulations. Results indicate that, when hydrogen concentrations are low, crack growth occurs by alternating mechanisms of cleavage and slip. However, as the hydrogen concentrations increased above some critical value, the crack grows predominately by the cleavage-based decohesion process.

KW - cleavage

KW - discrete dislocation

KW - dislocation

KW - hydrogen embrittlement

UR - http://www.scopus.com/inward/record.url?scp=84948688531&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84948688531&partnerID=8YFLogxK

U2 - 10.1515/corrrev-2015-0068

DO - 10.1515/corrrev-2015-0068

M3 - Article

AN - SCOPUS:84948688531

VL - 33

SP - 467

EP - 475

JO - Corrosion Reviews

JF - Corrosion Reviews

SN - 0334-6005

IS - 6

ER -