Article Dans Une Revue JOM Journal of the Minerals, Metals and Materials Society Année : 2022

Revealing the Localization of NiAl-Type Nano-Scale B2 Precipitates Within the BCC Phase of Ni Alloyed Low-Density FeMnAlC Steel

M. Ponnuchamy
  • Fonction : Auteur
M. Sadhasivam
  • Fonction : Auteur
Chinmoy Mahata
  • Fonction : Auteur
G. Vijayaragavan
  • Fonction : Auteur
Karanam Gururaj
  • Fonction : Auteur
N. Chandrasekaran
  • Fonction : Auteur
Krushna Kumbhar
  • Fonction : Auteur
D. Prabhu
  • Fonction : Auteur
K. Suresh
  • Fonction : Auteur
K.G. Pradeep
  • Fonction : Auteur

Résumé

Coherent intermetallic precipitate-strengthened, Fe-Mn-based low-density steels are of interest owing to their superior mechanical properties. We present here the observation of 2-4-nm-sized, Ni-Al-type B2 precipitates localized within the disordered BCC phase, which is embedded in the major FCC structured austenitic (γ) matrix. Upon exposure to high temperatures of 1110°C for 30 min, the B2 phase coarsens, reaching a size of ~ 26 nm while still positioned within the BCC phase. It further disintegrates into ~ 6-nm-sized precipitates upon annealing at 1200°C for 30 min indicating the limited stability of the B2 phase. Thermodynamic phase analysis also supports the above observation of decreasing B2 phase stability with increasing temperature beyond 1100°C. In addition, APT also revealed the presence of κ-precipitates localized within the majority γ matrix. The collective contribution of κ, B2 and A2 phases strengthens the majority γ matrix of the hot-rolled steel, resulting in achieving an ultimate tensile strength in excess of 1.2 GPa with an extended ductility of ~34% at room temperature.

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hal-04194616 , version 1 (28-01-2025)

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Mainak Saha, M. Ponnuchamy, M. Sadhasivam, Chinmoy Mahata, G. Vijayaragavan, et al.. Revealing the Localization of NiAl-Type Nano-Scale B2 Precipitates Within the BCC Phase of Ni Alloyed Low-Density FeMnAlC Steel. JOM Journal of the Minerals, Metals and Materials Society, 2022, 74 (8), pp.3181-3190. ⟨10.1007/s11837-022-05349-2⟩. ⟨hal-04194616⟩
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