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1 Journal of Applied Mathematics and Computational Mechanics

1 2015

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Application of analytical methods for predicting the structures of steel phase transformations in welded joints

Piekarska W., Goszczyńska D., Saternus Z.

Journal of Applied Mathematics and Computational Mechanics

2015

Vol. 14, nr 2

61--72

The paper presents the feasibility the prediction of phase structures of the medium carbon S355 steel under the transformations running in welding process by using analytical methods. The relationships proposed here allow to specify start and finish temperatures of phase transformations in the case of formation of bainite, ferrite, pearlite and martensite structures at various cooling rates v8/5 (t8/5) as well. Continuous-Cooling-Transformation (CCT) diagram and volumetric fractions of each steel phases possible to occur are determined in function of cooling rates. Analytically obtained values are compared with results obtained by dilatometric research. Correctness of applied analytical methods in this field has been verified when the structure compositions formed in the heat affected zone (HAZ) of electric arc butt-welded sheets made of the S355 steel were predicted.