Influence of bainite reaction on the kinetics of carbon redistribution during the Quenching and Partitioning process

Nishikawa, A.S.; Santofimia, Maria Jesus; Sietsma, J.; Goldenstein, Hélio

doi:10.1016/j.actamat.2017.09.048

Influence of bainite reaction on the kinetics of carbon redistribution during the Quenching and Partitioning process

Title

Influence of bainite reaction on the kinetics of carbon redistribution during the Quenching and Partitioning process

Author

Nishikawa, A.S. (Universidade de São Paulo)
Santofimia, Maria Jesus (TU Delft (OLD) MSE-3)
Sietsma, J. (TU Delft (OLD) MSE-3)
Goldenstein, Hélio (Universidade de São Paulo)

Date

2018

Abstract

In the present study the microstructural evolution and kinetics of carbon redistribution during the partitioning step of the Quenching and Partitioning process are investigated by means of a modeling approach that simultaneously considers the martensite-austenite carbon partitioning and the decomposition of austenite into bainitic ferrite. The development of the phase fractions, interface position, and carbon compositions are analyzed for two different binary Fe-C alloys with distinct initial carbon compositions and simulation geometries. The composition dependence of carbon diffusivity in austenite is taken into account for solving the diffusion field equations. Simulations indicate that kinetics of carbon partitioning from martensite to austenite is controlled by carbon diffusion in martensite and it is little affected by simultaneous occurrence of bainite reaction. On the other hand martensite-austenite carbon partitioning strongly influences the bainite reaction by inhibiting the growth of bainitic ferrite.

Subject

Bainite
Mixed-mode model
Modeling
Quenching and Partitioning

To reference this document use:

http://resolver.tudelft.nl/uuid:78aed900-ff24-408e-bc86-7459406ac0a2

DOI

https://doi.org/10.1016/j.actamat.2017.09.048

Embargo date

2019-10-20

ISSN

1359-6454

Source

Acta Materialia, 142, 142-151