Austenite _ ferrite transformation temperature regression equations for low carbon steels with cooling rate account

6th Global Conference on Materials Science and Engineering

Záhumenský, P.^1 ; Kohútek, I.^1 ; Semeák, J.^1

U. S. Steel Koice, Koice

044 54, Slovakia^1

关键词: Austenite-ferrite transformation;    Chemical compositions;    Cooling rates;    Lower critical;    Regression equation;    Rolling control;    Thermomechanical simulator;    Transformation temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/283/1/012024/pdf
DOI  :  10.1088/1757-899X/283/1/012024

来源: IOP

【 摘 要 】

The austenite-ferrite transformation temperatures evaluated by dilatometry using thermo-mechanical simulator Gleeble 1500D are investigated in this paper. The effect of cooling rates 1, 5, 10 and 15°C/s on the upper and lower critical transformation temperatures was evaluated for 30 specimens of six material groups. Considering the cooling rate from dilatometry tests and chemical composition (C ≤ 0.2%, Mn ≤ 2%, Si ≤ 0.26%) of particular specimens, the regression equations for both transformation temperatures were derived. These relations have to be satisfied to avoid the crack formation during continuous casting, as well as to provide the hot rolling control. The proposed regression equations are compared with 32 similar ones adopted from 1961 to 2017 and exhibit a good conformity and accuracy.