The Incomplete transformation phenomenon in Fe-C-Mo alloys

Reynolds, W. T.; Li, F. Z.; Shui, C.K.; Aaronson, H.I.

doi:10.1007/bf02672561

Cited by 135 publications

(100 citation statements)

References 46 publications

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“…This is lower by agprox. 90K than that in an Fe-l%Mo-Od%C alloy [13], indicating that M n effectively lowers the kinetic-Bs. In order to confirm that the bainite transformation is regarded as a separate reaction with its own C-curve, we observed the microstructural change during the isothermal holding at 82313 (just below the kinetic-Bs).…”

Section: Formation Temperature Of Bainitic Ferrltementioning

confidence: 85%

Some Aspects of Bainite Transformation in Fe-Based Alloys

Tsuzaki

Maki

1995

J. Phys. IV France

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Section: Formation Temperature Of Bainitic Ferrltementioning

confidence: 85%

Some Aspects of Bainite Transformation in Fe-Based Alloys

Tsuzaki

Maki

1995

J. Phys. IV France

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“…The second definition is that B s is the upper limiting temperature for an incomplete bainite transformation in a TTT diagram; 4) this temperature is called kinetic-B s . Although kinetic-B s appears in alloys that contain Mo, 5) Cr, 6) Mn, 7) and Nb, 8) its appearance in low-alloyed Fe-C alloys, 2,[7][8][9] in which the C-curves of bainite and diffusion transformation (ferrite and pearlite) overlap extensively, as shown in Fig. 1(c), is unclear.…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Content on Bainite Transformation Start Temperature in Low Carbon Fe–9Ni–C Alloys

2017

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Bainite in steel is an industrially useful structure. However, the controlling factor of its transformation start point is not known clearly. In this study, to clarify the effect of carbon content on the bainite transformation start temperature (B s ), we evaluated the dilatation curve and the microstructure in low carbon Fe-9Ni alloys. As a result, B s decreased with increasing of carbon content. Furthermore, the driving force of partitionless transformation from fcc to bcc at B s , which was calculated considering nickel segregation, was approximately constant at 400 J/mol in all alloys. This value is consistent with the driving force required for partitionless growth of ferrite, as reported in a previous study. This consistency suggests that B s depends on the martensitic growth behavior of lath-shaped ferrite, which is determined by the supercooling starting from the T 0 line.

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“…[5] The incomplete reaction phenomenon, described as the premature cessation of bainite formation before the equilibrium fraction of this phase is attained, is explained by the solute drag effect that significantly retards the growth of the bainitic ferrite. [6][7][8] The diffusionless approach was introduced by Zener in 1946 [9] further developed by Ko and Cottrell, [10] and more recently supported by Bhadeshia. [11] According to this approach, a sub-unit of bainitic ferrite, supersaturated in carbon, nucleates on an austenite grain boundary.…”

Section: Introductionmentioning

confidence: 99%

Bainite Formation in Medium-Carbon Low-Silicon Spring Steels Accounting for Chemical Segregation

Goulas

Mecozzi

Sietsma

2016

Metall Mater Trans A

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In this paper, the effect of chemical inhomogeneity on the isothermal bainite formation is investigated in medium-carbon low-silicon spring steel by dilatometry and microscopy. The analysis of the microstructure at different times during transformation shows that chemical segregation of substitutional alloying elements resulting from casting strongly affects the bainite formation by retarding the transformation kinetics and limiting the maximum achievable bainite fraction. During holding at temperatures close to and above the martensite start temperature, a homogeneous lower bainitic microstructure can be eventually obtained, whereas at higher temperatures, incomplete bainitic reaction is evident. It was also found that at the early stages of the transformation, differences in the bainite formation kinetics, due to local inhomogeneities in Cr and Mn concentration, result in retardation of the growth of bainite in the high Mn and Cr concentration regions. The calculated difference in driving force for nucleation between the enriched and the depleted areas is not by itself sufficient to explain the microstructures obtained and thus significant influence of growth on bainite formation is observed. Particularly, it was calculated and experimentally observed that Cr partitions in the carbides in the high Mn, Cr regions during the isothermal treatment, limiting the transformation kinetics.

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The Incomplete transformation phenomenon in Fe-C-Mo alloys

Cited by 135 publications

References 46 publications

Some Aspects of Bainite Transformation in Fe-Based Alloys

Some Aspects of Bainite Transformation in Fe-Based Alloys

Effect of Carbon Content on Bainite Transformation Start Temperature in Low Carbon Fe–9Ni–C Alloys

Bainite Formation in Medium-Carbon Low-Silicon Spring Steels Accounting for Chemical Segregation

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