Features of polymorphic transformation kinetics during heating for low-carbon steels

Surovtsev, A.P.; Yarovoi, V. V.

doi:10.1007/bf00712549

Cited by 11 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that the effect of the separation of the range Ac n -Ac 3 into two regions in compact carbon steels seems to have been discovered for the first time by the authors of [2,3], and its special features were considered by the author of [4]. Similar results were obtained in the DTA of powder steels with carbon concentrations equal to 0.2, 0.4, and 0.6%.…”

supporting

confidence: 63%

Special features of the ? ? ? transformation in powder carbon steels

Antsiferov¹,

Grevnev²,

Perel'man³

1996

Met Sci Heat Treat

View full text Add to dashboard Cite

The structural state of powder steels after sintering depends on the technological regimes of their production and can markedly affect the transformations in subsequent heat treatment. The effect of the technological regimes on the nature of the ¢t -~ 1' transformation is investigated.We investigated the effect of sintering regimes on the transformations in powder carbon steels with different densities. Steel specimens were prepared from a mixture of powders of commercial iron PZh4M2 and dry colloidal-graphite agent C-I. The specimens were pressed at 500 and 800 N/ram 2 and sintered in a hydrogen medium (with a dew point td.p=-35°C) at l l00 and 1200°C for I-4 h. Basic results were obtained for steels with the technological regimes, densities, and chemical compositions presented in Table 1. In order to check the results obtained we prepared specimens of powder carbon steels with 0.2-0.6% C using an identical technology of single pressing at 100 -800 N/ram 2 and a sintering temperature of 1150°C.

show abstract

supporting

confidence: 63%

Special features of the ? ? ? transformation in powder carbon steels

Antsiferov¹,

Grevnev²,

Perel'man³

1996

Met Sci Heat Treat

View full text Add to dashboard Cite

show abstract

“…Even for a fully austenitic layer, the chemical composition may present local heterogeneities due to initial microstructure features leading thus to local differences in final microstructure with different local mechanical properties. It is worth noting, that most of investigations reported in literature have been carried out on the austenitization of steels with initial ferrite-pearlite microstructure [4][5][6][7][8][9][10][11][12][13][14] . The analysis of austenite formation for the same steel having different initial microstructures and for different heating rates is of technological and fundamental importance.…”

Section: Introductionmentioning

confidence: 99%

Carbon content evolution in austenite during austenitization studied by in situ synchrotron X-ray diffraction of a hypoeutectoid steel

et al. 2020

View full text Add to dashboard Cite

Using in situ high energy X-ray diffraction study of austenite formation in hypoeutectoid steel with three different initial microstructures (ferrite-pearlite, tempered martensite and bainite), the lattice parameters of ferrite, cementite and austenite are examined on heating at 0.25, 10 and 100 °C/s. The lattice parameters of ferrite, cementite and austenite do not vary linearly with the temperature, especially, in the temperature range where the austenitization takes place. For the austenite, it is suggested that the deviation from the linearity is mainly associated to the carbon content variation. Using Dyson and Holmes equation, the carbon content in austenite is evaluated for any moment of the austenite formation for each initial microstructure and all heating rates. For the ferrite-pearlite microstructure heated at 0.25 °C/s, the carbon content in austenite after complete cementite dissolution corresponds to that of pearlite. Moreover, a rapid decrease in carbon content in the austenite is observed during the first stage of the austenitization (simultaneous dissolution of ferrite and cementite) followed by a slow further decrease during the transformation of the remaining ferrite. The obtained results are discussed using thermodynamic calculations.

show abstract