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ANALITYCAL METHODS FOR THE ANAYSIS OF PHASE TRANSFORMATIONS IN SOLID STATE OCCURING DURING WELDING

1 PIEKARSKA Wiesława
Co-authors:
1 GOSZCZYŃSKA Dorota
Institution:
1 Częstochowa University of Technology, Institute of Mechanics and Machine Design Foundations, Częstochowa, Poland, EU
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
827-832
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
411 views / 270 downloads
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Abstract

Analytical models used for the analysis of phase transformations as well as the prediction of structural composition of welded elements are the subject of research for many years. Despite of certain simplifications they are invaluable in assessing the weldability and welding conditions. Results obtained by analytical methods are often used for the initial analysis of the material properties prior to the experimental studies and used before developing of mathematical models.The paper presents an analysis of phase transformations in solid state during welding of S460 steel. Empirical relations are given with the cooling rates taken into consideration, on which start and finish temperatures of bainite, ferrite pearlite, and martensite transformation are determined. Obtained data allowed predicting different start and finishing temperatures of phase transformations for various cooling rates v8/5 (t8/5). Analytical Continuous-Cooling-Transformation (CCT) diagram for steel is determined as well as volume fractions of phases in a function of cooling rates. Analytically obtained results are compared with experimental data obtained by dilatometric tests.

Keywords: analytical methods, phase transformations, heat affected zone, phase volumetric fractions

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