Chemical gradients across phase boundaries between martensite and austenite in steel studied by atom probe tomography and simulation

By O. Dmitrieva, D. Ponge, G. Inden, J. Mill'an, P. Choi, J. Sietsma, D. Raabe. 2014

292 citations recorded by the source corpus.

Partitioning at phase boundaries of complex steels is important for their properties. We present atom probe tomography results across martensite/austenite interfaces in a precipitation-hardened maraging-TRIP steel (12.2 Mn, 1.9 Ni, 0.6 Mo, 1.2 Ti, 0.3 Al; at.%). The system reveals compositional changes at the phase boundaries: Mn and Ni are enriched while Ti, Al, Mo and Fe are depleted. More specific, we observe up to 27 at.% Mn in a 20 nm layer at the phase boundary. This is explained by the large difference in diffusivity between martensite and austenite. The high diffusivity in martensite leads to a Mn flux towards the retained austenite. The low diffusivity in the austenite does not allow accommodation of this flux. Consequently, the austenite grows with a Mn composition given by local equilibrium. The interpretation is based on DICTRA and mixed-mode diffusion calculations (using a finite interface mobility).

Subfields: Biomedical Engineering, Mechanical Engineering, Metals and Alloys

View Paper: https://www.semanticscholar.org/paper/c3782fd9518d74cdf830e407d67ddd56464849a4

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Biomedical Engineering

1. Dierk Raabe
2. C. Tasan
3. Franz Roters
4. D. Ponge
5. M. Diehl
6. P. Choi
7. K. Tsuzaki
8. Motomichi Koyama

In Mechanical Engineering

1. Dierk Raabe
2. C. Tasan
3. Franz Roters
4. M. Diehl
5. D. Ponge
6. K. Tsuzaki
7. Motomichi Koyama
8. P. Choi

In Metals and Alloys

1. Dierk Raabe
2. C. Tasan
3. Motomichi Koyama
4. K. Tsuzaki
5. D. Ponge
6. Franz Roters
7. P. Choi
8. O. A. Zambrano

Citations in the corpus

• An Overview of Dual-Phase Steels: Advances in Microstructure-Oriented Processing and Micromechanically Guided Design (2015, background): “The strength of this design strategy had been previously demonstrated for different steels (17, 119).”
• Grain boundary segregation engineering in metallic alloys: A pathway to the design of interfaces (2014, unknown): “1 shows experimentally obtained segregation coefficients for a number of Fe-, Ni-, and Cu-matrix binary systems compiled mainly by Hoffmann, Lejček [14,40–42,46], Shea, and Hondros [12,15,39], as well a s some measurements conducted by the current authors using atom probe tomography [29,76,83,85].”