On a Theorem of Brownawell

Takeuchi, Mamoru

doi:10.5036/bfsiu1968.11.51

Cited by 1 publication

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Evidence for substitutional solute diffusion along grain boundaries can be detected in a Co-20 pct Fe alloy austenitized at 900°C for 30 minutes and isothermally reacted at 700°C for 24 hours. [26] As an example, Figure 1 displays that due to augmentation of Co atoms, which were rejected from bcc a particles, the matrix phase was able to maintain its fcc structure, whereas the majority of the matrix (away from the grain boundaries) was transformed into bcc martensites upon cooling. Thus, the mean concentration of Mn or Si for nucleation in full equilibrium can be calculated from the equation…”

Section: Calculation Of Mean Concentration Of Solute In the Matrixmentioning

confidence: 98%

“…A study of nucleation of bcc precipitates at grain boundaries from the fcc matrix is in progress using a Co-15Fe alloy, austenitized and isothermally reacted in the (a + c) two-phase region. [26] The types of nucleation sites, e.g., grain corner or edge, were identified by serial sectioning. The results so far have shown that approximately 60 pct of the grain corners were Fig.…”

Section: E Nucleation At Grain Corners Without Free Energy Barriermentioning

confidence: 99%

See 1 more Smart Citation

Simulation of Nucleation of Proeutectoid Ferrite at Austenite Grain Boundaries during Continuous Cooling

Enomoto

Yang

2008

Metall Mater Trans A

View full text Add to dashboard Cite

The nucleation kinetics of proeutectoid ferrite during continuous cooling in three Fe-C-Mn-Si steels, measured in-situ by three-dimensional X-ray diffraction microscope, are compared with numerical simulation that takes into account differences in the activation energy of nucleation among grain boundary faces, edges, and corners. The essential feature of ferrite nucleation in the 0.21 pct C steel, i.e., nucleation occurred just below Ae 3 and ceased at a small undercooling, is reproduced taking into account the site consumption, primarily at grain corners and overlap of solute diffusion fields in the grain boundary region or the matrix and assuming a very small or almost null activation energy of nucleation. In the 0.35 and 0.45 pct C steels, small activation energy, as reported by Offerman et al., was not unequivocally obtained because ferrite nucleation occurred at considerably large undercoolings, even below the paraequilibrium Ae 3 in these steels. The increasing rate of the observed particle number with decreasing temperature is considerably smaller than calculation.

show abstract

Section: Calculation Of Mean Concentration Of Solute In the Matrixmentioning

confidence: 98%

Section: E Nucleation At Grain Corners Without Free Energy Barriermentioning

confidence: 99%

Simulation of Nucleation of Proeutectoid Ferrite at Austenite Grain Boundaries during Continuous Cooling

Enomoto

Yang

2008

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

On a Theorem of Brownawell

Cited by 1 publication

References 3 publications

Simulation of Nucleation of Proeutectoid Ferrite at Austenite Grain Boundaries during Continuous Cooling

Simulation of Nucleation of Proeutectoid Ferrite at Austenite Grain Boundaries during Continuous Cooling

Contact Info

Product

Resources

About