On the three-dimensional atomic scale characterisation towards understanding the sequence of nano-scale B2 phase evolution in Ni-alloyed Fe-Mn-Al-C low-density steel

Authors

Mainak Saha¹ , M. Sadhasivam¹ , M.B. Ponnuchamy¹ , K. Gururaj¹ , C. Mahata¹ , N. Chandrasekaran¹ , G. Vijayaragavan² , D. Prabhu² , K. Suresh³ , K. Kumbhar⁴ , K.G. Pradeep¹

1. Indian Institute of Technology Madras
2. ARCI Chennai
3. ARCI Hyderabad
4. DMRL Hyderabad

Conference / event

Annual Meeting of the Electron Microscopy Society of India (EMSI), February 2023 (New Delhi, India)

Poster summary

One among the major factors that influence the mechanical properties of multi-component steels are the different phases present in it and their volume fraction, morphology, distribution and thermal stability. Here we report on the thermal stability and the associated phase evolution sequence especially that of nanoscale precipitates in a hot-rolled Ni-alloyed Fe-16Mn-9Al-0.9C (wt.%) low-density steel. Bulk phase analysis using X-ray diffraction shows the presence of three phases, namely FCC structured γ,L12 ’structured κ and BCC phases in as-rolled condition which are in agreement with thermodynamic phase predictions. Combined microscopic analysis involving three-dimensional atom probe tomography revealed the presence of nano-scale κ and Ni-Al type B2 precipitates, highly localized within majority γ and banded BCC phase regions respectively. This poster, therefore will focus on the temporal evolution of B2 nanoprecipitates and their localisation within the banded BCC phase regions along with their stability as a function of thermal treatment.

Keywords

Phase evolution, Precipitate coarsening, Correlative Microscopy, Atom Probe Tomography

Research areas

Material Sciences

References

1. Saha Mainak, Ponnuchamy M. B., Sadhasivam M., Mahata Chinmoy, Vijayaragavan G., Gururaj Karanam, Suresh K., Chandrasekaran N., Prabhu D., Kumbhar Krushna, Pradeep K. G.. Revealing the Localization of NiAl-Type Nano-Scale B2 Precipitates Within the BCC Phase of Ni Alloyed Low-Density FeMnAlC Steel. JOM. Vol. 74(8):3181–3190. 2022. Springer Science and Business Media LLC.

Funding

No data provided

Supplemental files

No data provided

Additional information

Competing interests

No competing interests were disclosed.

Data availability statement

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

Creative Commons license

Copyright © 2024 Saha et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.