Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Modeling Bainitic Transformation in a Case Hardening Steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The paper contains experimental and simulated results for the phase transformation of austenite to bainite during isothermal conditions. A case hardening steel is studied at four carbon contents, using a dilatometer. The bainite fraction is calculated by time integration of a time-independent transformation rate equation, derived from Austin-Rickett kinetics. Simulations in COMSOL Multiphysics produces bainite fractions correlating to experiments.

National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25850OAI: oai:DiVA.org:kth-25850DiVA: diva2:360152
Note
QC 20101102Available from: 2010-11-02 Created: 2010-11-02 Last updated: 2010-11-02Bibliographically approved
In thesis
1. Modeling Phase Transformations and Volume Changes during Cooling of Case Hardening Steels
Open this publication in new window or tab >>Modeling Phase Transformations and Volume Changes during Cooling of Case Hardening Steels
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Case hardening distortions are a major problem for gear manufacturers. The aim of the current work is to create a simulation model, able to predict how and when case hardening distortions arise. The results presented in this thesis form a basis for such a model.

Two case hardening steels, with base carbon contents of 0.20 and 0.21 % C were studied using dilatometer experiments. One of them was carburized to 0.36, 0.52 and 0.65 % C in order to investigate the influence of carbon content. Experiments were performed during both isothermal and continuous heating and cooling conditions. The results were used to evaluate phase transformations, heat expansion behaviors and phase transformation strains. The expansion behavior of the material was modeled as a function of temperature, carbon content and phase fractions. The phase transformations to martensite and bainite were modeled, using the Koistinen-Marburger equation and a transformation rate equation based on Austin-Rickett kinetics, respectively. Experiments were simulated using the COMSOL Multiphysics software, to verify the model with respect to martensite and bainite transformations, heat expansion behavior and phase transformation strains.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. x, 37 p.
Series
ISRN KTH/MSE--09/47--SE+MEK/AVH
Keyword
Phase transformation, volume changes
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-11369 (URN)978-91-7415-459-7 (ISBN)
Presentation
2009-11-18, M312, Brinellvägen 68, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2009-11-05 Created: 2009-11-02 Last updated: 2010-11-02Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Tehler, MatildaJonsson, Stefan
By organisation
Materials Science and Engineering
Other Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 74 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf