Modelling the creep behaviour of tempered martensitic steel based on a hybrid approach

Surya Deo Yadav, Bernhard Sonderegger, Muhammad Stracey, Maria Cecilia Poletti

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In this work, we present a novel hybrid approach to describe and model the creep behaviour of tempered martensitic steels. The hybrid approach couples a physically based model with a continuum damage mechanics (CDM) model. The creep strain is modelled describing the motions of three categories of dislocations: mobile, dipole and boundary. The initial precipitate state is simulated using the thermodynamic software tool MatCalc. The particle radii and number densities are incorporated into the creep model in terms of Zener drag pressure. The Orowan's equation for creep strain rate is modified to account for tertiary creep using softening parameters related to precipitate coarsening and cavitation. For the first time the evolution of internal variables such as dislocation densities, glide velocities, effective stresses on dislocations, internal stress from the microstructure, subgrain size, pressure on subgrain boundaries and softening parameters is discussed in detail. The model is validated with experimental data of P92 steel reported in the literature.

Original languageEnglish
Pages (from-to)330-341
Number of pages12
JournalMaterials science and engineering / A
Volume662
DOIs
Publication statusPublished - 26 Apr 2016

Fingerprint

Martensitic steel
Creep
steels
softening
Precipitates
precipitates
pressure drag
Continuum damage mechanics
software development tools
Steel
Coarsening
cavitation flow
Cavitation
strain rate
residual stress
Drag
Strain rate
Residual stresses
Thermodynamics
dipoles

Keywords

  • Creep
  • Damage
  • Dislocations
  • P92
  • Physically based modelling
  • Precipitates

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Modelling the creep behaviour of tempered martensitic steel based on a hybrid approach. / Yadav, Surya Deo; Sonderegger, Bernhard; Stracey, Muhammad; Poletti, Maria Cecilia.

In: Materials science and engineering / A, Vol. 662, 26.04.2016, p. 330-341.

Research output: Contribution to journalArticleResearchpeer-review

@article{f4e63efa08044aaa9bb393ab08e6c2d6,
title = "Modelling the creep behaviour of tempered martensitic steel based on a hybrid approach",
abstract = "In this work, we present a novel hybrid approach to describe and model the creep behaviour of tempered martensitic steels. The hybrid approach couples a physically based model with a continuum damage mechanics (CDM) model. The creep strain is modelled describing the motions of three categories of dislocations: mobile, dipole and boundary. The initial precipitate state is simulated using the thermodynamic software tool MatCalc. The particle radii and number densities are incorporated into the creep model in terms of Zener drag pressure. The Orowan's equation for creep strain rate is modified to account for tertiary creep using softening parameters related to precipitate coarsening and cavitation. For the first time the evolution of internal variables such as dislocation densities, glide velocities, effective stresses on dislocations, internal stress from the microstructure, subgrain size, pressure on subgrain boundaries and softening parameters is discussed in detail. The model is validated with experimental data of P92 steel reported in the literature.",
keywords = "Creep, Damage, Dislocations, P92, Physically based modelling, Precipitates",
author = "Yadav, {Surya Deo} and Bernhard Sonderegger and Muhammad Stracey and Poletti, {Maria Cecilia}",
year = "2016",
month = "4",
day = "26",
doi = "10.1016/j.msea.2016.03.071",
language = "English",
volume = "662",
pages = "330--341",
journal = "Materials science and engineering / A",
issn = "0921-5093",
publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Modelling the creep behaviour of tempered martensitic steel based on a hybrid approach

AU - Yadav, Surya Deo

AU - Sonderegger, Bernhard

AU - Stracey, Muhammad

AU - Poletti, Maria Cecilia

PY - 2016/4/26

Y1 - 2016/4/26

N2 - In this work, we present a novel hybrid approach to describe and model the creep behaviour of tempered martensitic steels. The hybrid approach couples a physically based model with a continuum damage mechanics (CDM) model. The creep strain is modelled describing the motions of three categories of dislocations: mobile, dipole and boundary. The initial precipitate state is simulated using the thermodynamic software tool MatCalc. The particle radii and number densities are incorporated into the creep model in terms of Zener drag pressure. The Orowan's equation for creep strain rate is modified to account for tertiary creep using softening parameters related to precipitate coarsening and cavitation. For the first time the evolution of internal variables such as dislocation densities, glide velocities, effective stresses on dislocations, internal stress from the microstructure, subgrain size, pressure on subgrain boundaries and softening parameters is discussed in detail. The model is validated with experimental data of P92 steel reported in the literature.

AB - In this work, we present a novel hybrid approach to describe and model the creep behaviour of tempered martensitic steels. The hybrid approach couples a physically based model with a continuum damage mechanics (CDM) model. The creep strain is modelled describing the motions of three categories of dislocations: mobile, dipole and boundary. The initial precipitate state is simulated using the thermodynamic software tool MatCalc. The particle radii and number densities are incorporated into the creep model in terms of Zener drag pressure. The Orowan's equation for creep strain rate is modified to account for tertiary creep using softening parameters related to precipitate coarsening and cavitation. For the first time the evolution of internal variables such as dislocation densities, glide velocities, effective stresses on dislocations, internal stress from the microstructure, subgrain size, pressure on subgrain boundaries and softening parameters is discussed in detail. The model is validated with experimental data of P92 steel reported in the literature.

KW - Creep

KW - Damage

KW - Dislocations

KW - P92

KW - Physically based modelling

KW - Precipitates

UR - http://www.scopus.com/inward/record.url?scp=84962485419&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2016.03.071

DO - 10.1016/j.msea.2016.03.071

M3 - Article

VL - 662

SP - 330

EP - 341

JO - Materials science and engineering / A

JF - Materials science and engineering / A

SN - 0921-5093

ER -