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Determination of critical points of hypoeutectoid steels

100%

Pawłowski B.

Archives of Metallurgy and Materials

2012

tom Vol. 57, iss. 4

957-962

The paper presents a new approach to interpretation of hypoeutectoid steel dilatograms upon heating between the austenite start and austenite finish temperatures. The proposed derivative curve separation method yields data which accords with the experimental results. Besides the new method appears a useful tool whereby it becomes possible to confirm the evidence reported earlier in literature that when a hypoeutectoid steel heats up to between the A ⊂1 and the A ⊂3 both ferrite and pearlite start to transform into austenite almost at the same time.

Wpracy przedstawiono nowy sposób interpretacji dylatogramów nagrzewania stali podeutektoidalnych w zakresie przemiany perlitu i ferrytu w austenit. Zastosowanie proponowanej metody analizy dylatogramów nagrzewania stali podeutektoidalnych pozwoliło równiez na potwierdzenie publikowanych wczesniej w literaturze doniesien o jednoczesnym zachodzeniu przemiany perlitu w austenit z przemiana ferrytu w austenit w zakresie temperatury pomiedzy A ⊂1 i A ⊂3.

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

100%

Pawłowski B.

Journal of Achievements in Materials and Manufacturing Engineering

2011

tom Vol. 49, nr 2

331--337

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.

Dilatometric examination of continuously heated austenite formation in hypoeutectoid steels

100%

Pawłowski B.

Journal of Achievements in Materials and Manufacturing Engineering

2012

tom Vol. 54, nr 2

185--193

Purpose: of this work is to present possibility of proper determination of pearlite dissolution finish temperature Ac1f during heating of hypoeutoctoid steels. Design/methodology/approach: The presented schemes of splitting the first derivative curve of hypoeutectoid steels dilatograms are based on experimental dilatograms and their first derivatives obtained by use of the dilatometric technique. Findings: The nine possible schemes of splitting the first derivative curve of hypoeutectoid steels dilatograms were developed. These schemes have been developed for three main cases: ferrite to austenite transformation temperature range is wider than for pearlite to austenite transformation, ferrite to austenite transformation temperature range has the same width as for the pearlite to austenite transformation and ferrite to austenite transformation temperature range is shorter than for pearlite to austenite transformation. Presented schemes are fully compatible with experimental results. Research limitations/implications: Further verification of correctness of the presented schemes and the development of appropriate curve fitting software is needed. Practical implications: Broadening the knowledge on the phase transformation kinetics of hypoeutectoid steels during heating. The basics for the automate process of determination of critical temperatures in steels, especially the Ac1f temperature, were established. Originality/value: The originally schemes of splitting the first derivative curve of hypoeutectoid steels dilatograms were developed.