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Carbon partitioning and mechanis of bainite reaction in experimental FE-CR-MO-C steel

Ławrynowicz Z.

Journal of Polish CIMAC

2012

Vol. 7, no 3

167-174

Carbon partitioning and mechanism of bainite transformation have been studied in Fe-Cr-Mo-C steel using high speed dilatometry backed by thermodynamic analysis. Obtained results confirm the incomplete reaction phenomenon with the cessation of the bainite transformation well before paraequilibrium is achieved. These experimental data indicate that bainitic ferrite forms by a displacive transformation mechanism, but soon afterwards, excess of carbon is partitioned into the residual austenite. The results are discussed in terms of the mechanism of bainite transformation.

An investigation of the mechanism of bainite transformation in experimental 0.2c-1v-2mn steel

Ławrynowicz Z.

Advances in Materials Science

2012

Vol. 12, nr 2(32)

19-30

The paper presents an investigation of the mechanism of bainite transformation in 0.2C-1V-2Mn steel using high speed dilatometry and TEM backed by thermodynamic analysis. Obtained results confirm the incomplete reaction phenomenon with the cessation of the bainite transformation well before paraequilibrium is achieved. These experimental data indicate that bainitic ferrite forms by a displacive transformation mechanism, but soon afterwards, excess of carbon is partitioned into the residual austenite. The results are discussed in terms of the mechanism of bainite transformation.

Carbon partitioning during bainite transformation in low carbon alloy steels.

Ławrynowicz Z.

Inżynieria Materiałowa

2002

R. XXIII, nr 2

73-75

Carbon partitioning in untransformed austenite during bainite transformation has been studied using high-speed dilatometry. It was found that in samples partially transformed to bainite during subsequent quenching to ambient temperature two martensite start (Ms) temperatures can be registered. Because Ms temperature depends directly on carbon content in austenite, the obtained results may indicate that the carbon trapped in films of austenite between parallel subunits of bainitic ferrite is much larger than in the blocks of austenite. The obtained results point out a necessity of a substantial modification of bainite and martensite regions on the TTT (CCT) diagrams.

Z wykorzystaniem metod dylatometrycznych badano rozdział węgla zachodzący w nieprzemienionym austenicie w trakcie przemiany bainitycznej. Stwierdzono występowanie dwóch temperatur Ms podczas dochładzania próbek poddanych uprzednio częściowej przemianie bainitycznej. Fakt ten dowodzi prawdopodobnego zróżnicowania stężenia węgla w austenicie o morfologii blokowej oraz o morfologii cienkich warstw. Wyniki badań wskazują na konieczność zmodyfikowania fragmentów wykresów CTP niskowęglowych stali niskostopowych w zakresie przemiany bainitycznej i martenzytycznej.