Accounting for phase transformations during welding of ferritic steels

Cory J. Hamelin, Ondrej Muránsky, Vladimir Luzin, Philip Bendeich, Lyndon Edwards

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

3 Citations (Scopus)

Abstract

The numerical application of solid-state phase transformation kinetics relating to conventional welding of ferritic steels is presented. The inclusion of such kinetics in weld models is shown to be necessary for capturing the post-weld residual stress field. To this end, a comparison of two approaches is outlined: a semi-empirical approach that uses thermodynamic transformation kinetics to predict phase morphology; and a fully empirical approach that directly links local material temperature to the present constituent phase(s). The semi-empirical analysis begins with prediction of TTT diagrams using thermodynamic principles for ferritic steels. The data is then converted to CCT diagrams using the Scheil-Avrami additive rule, including austenite grain growth kinetics. This information is used to predict the phases present under varying peak temperatures and cooling rates. In the fully empirical approach, dilatometric experiments of steel samples are performed during heating to simulate expected welding conditions. The constitutive response of the sample is then used as input for the subsequent numerical weld analyses. Input derived from each technique is transferred into weld models developed using the Abaqus finite element package. Model validation is carried out by direct comparison with neutron diffraction residual stress measurements on two beams of SA508 Gr.3 Cl.1 steel subjected to autogenous beam TIG welds under varying torch speeds, heat input and preheat conditions.

Original languageEnglish
Title of host publicationProceedings of the ASME 2011 Pressure Vessels and Piping Conference (PVP 2011)
Subtitle of host publicationVolume 6: Materials and Fabrication, Parts A and B
Pages1469-1477
Number of pages9
DOIs
Publication statusPublished - 2011
Externally publishedYes
EventASME Pressure Vessels and Piping Conference (PVP) 2011 - Baltimore, United States of America
Duration: 17 Jul 201121 Jul 2011
https://asmedigitalcollection.asme.org/PVP/PVP2011/volume/44519 (Proceedings)

Conference

ConferenceASME Pressure Vessels and Piping Conference (PVP) 2011
Abbreviated titlePVP 2011
CountryUnited States of America
CityBaltimore
Period17/07/1121/07/11
Internet address

Keywords

  • Ferritic steel
  • Finite element analysis
  • Phase transformation
  • Residual stress
  • Welding

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