Abstract
The current work presents the numerical analysis of solid-state transformation kinetics relating to conventional welding of ferritic steels, with the aim of predicting the constituent phases in both the fusion zone and the heat affected zone (HAZ) of the weldment. The analysis begins with predictions of isothermal transformation kinetics using thermodynamic principles, such that the chemical composition of the parent metal is the sole user-defined input. The data is then converted to anisothermal transformation kinetics using the Scheil-Avrami additive rule, including the effects of peak temperature and austenite grain growth. Subroutines developed for the Abaqus finite element package use the semi-empirical approach described to predict phase transformations in SA508 Gr.3 Cl.1 steel. To study the effect of the cooling rates and the ability of the current model to predict the final microstructure, two weld samples were subjected to autogenous beam TIG welds under a fast (TG5-F, 5.00 mm/s) and slow (TG5-S, 1.25 mm/s) torch speed. Model validation is carried out by direct comparison with microstructural observations and hardness measurements (via nano-indentation) of the fusion and heat affected zones in both welds. Excellent agreement between the measured and predicted hardness has been found for both weld samples. Additionally, it is shown that the correct identification of the partial austenisation region is a crucial input parameter.
Original language | English |
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Title of host publication | THERMEC 2011 |
Pages | 1403-1408 |
Number of pages | 6 |
Volume | 706-709 |
DOIs | |
Publication status | Published - 2012 |
Externally published | Yes |
Event | International Conference on Processing and Manufacturing of Advanced Materials 2011 - Quebec City, Canada Duration: 1 Aug 2011 → 5 Aug 2011 Conference number: 7th http://www.proceedings.com/13958.html |
Publication series
Name | Materials Science Forum |
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Volume | 706-709 |
ISSN (Print) | 0255-5476 |
Conference
Conference | International Conference on Processing and Manufacturing of Advanced Materials 2011 |
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Abbreviated title | THERMEC 2011 |
Country | Canada |
City | Quebec City |
Period | 1/08/11 → 5/08/11 |
Internet address |
Keywords
- Ferritic steel
- Hardness
- Numerical analysis
- Phase transformation
- Welding