Chemical Composition Effects on the Microstructure and Hot Hardness of NiCrSiFeB Self-Fluxing Alloys Manufactured via Gravity Casting - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Manufacturing and Materials Processing Année : 2023

Chemical Composition Effects on the Microstructure and Hot Hardness of NiCrSiFeB Self-Fluxing Alloys Manufactured via Gravity Casting

Andrea Niklas
  • Fonction : Auteur
Fernando Santos
  • Fonction : Auteur
David Garcia
  • Fonction : Auteur
Mikel Rouco
Rodolfo González-Martínez
Juan Carlos Pereira
Emilio Rayón
Patricia Lopez
  • Fonction : Auteur

Résumé

Ni-Cr-Si-Fe-B self-fluxing alloys are commonly used in hardfacing applications; in addition, they are subjected to conditions of wear, corrosion, and high temperatures, but are not used in casting applications. In this work, gravity casting is presented as a potential manufacturing route for these alloys. Three alloys with different chemical compositions were investigated with a focus on microstructure characterization, solidification path, and strengthening mechanisms. Phases and precipitates were characterized using a field emission scanning electron microscope employing energy-dispersive X-ray spectroscopy, wavelength dispersive spectroscopy, and electron backscatter diffraction. Nano- and microhardness indentations were performed at different phases to understand their contribution to the overall hardness of the studied alloys. Hardness measurements were performed at room temperature and high temperature (650 °C). The borides and carbides were the hardest phases in the microstructure, thus contributing significantly to the overall hardness of the alloys. Additional hardening was provided by the presence of hard Ni3B eutectics; however, there was also a small contribution from the solid solution hardening of the γ-Ni dendrites in the high-alloy-grade sample. The amount and size of the different phases and precipitates depended mainly on the contents of the Cr, C, and B of the alloy.

Domaines

Matériaux

Dates et versions

hal-04606562 , version 1 (10-06-2024)

Identifiants

Citer

Andrea Niklas, Fernando Santos, David Garcia, Mikel Rouco, Rodolfo González-Martínez, et al.. Chemical Composition Effects on the Microstructure and Hot Hardness of NiCrSiFeB Self-Fluxing Alloys Manufactured via Gravity Casting. Journal of Manufacturing and Materials Processing, 2023, 7 (6), pp.196. ⟨10.3390/jmmp7060196⟩. ⟨hal-04606562⟩
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