Critical points of hypoeutectoid steel - prediction of the pearlite dissolution finish temperature Ac1f

Purpose: of this work is to present possibility of calculation of pearlite dissolution finish temperature during heating of hypoeutoctoid steels. Design/methodology/approach: The presented multiple linear regression equations for calculating the Ac1f temperature are based on experimental data set containing chemical composition and values of critical temperatures obtained by use of the dilatometric technique at the own laboratory only. Findings: The elaborated multiple linear regression equations for calculating the critical temperatures are an alternative to dilatometric examinations to obtain data necessary for proper heat treatment conditions planning. Research limitations/implications: All presented equations for calculating pearlite dissolution finish temperature are limited by range of mass concentrations of elements which is a consequence of limited data set used for elaboration of these equations. The obtained relationships do not concern other factors influencing Aclf temperature such as heating rate, grain size and interlamellar spacing of pearlite. Practical implications: Broadening the knowledge on the chemical composition influence on the critical temperatures, which will help in designing heat treatment conditions, especially of the Dual Phase steels. Originality/value: An attempt was made to find out a multiple linear regression formula between chemical composition and the pearlite dissolution finish temperature of hypoeutectoid steels.