• News
  • Talent
  • Webmail
  • Generic selectors
    Exact matches only
    Search in title
    Search in content
    Post Type Selectors

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

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.


Andrea Niklas (AZTERLAN), Fernando Santos (AZTERLAN), David García (AZTERLAN), Mikel Rouco (AZTERLAN), Rodolfo González-Martínez (AZTERLAN), Juan Carlos Pereira (Lortek), Emilio Rayón (Universitat Politècnica de València), Patricia Lopez (CIDETEC), Gaylord Guillonneau (University of Lyon)


NiCrSiFeB; self-fluxing alloys; gravity casting; microstructure; FESEM/EDS/WDS/EBSD analysis; X-ray diffraction; strengthening mechanisms; nano- and microhardness of phases; hot hardness; Thermo-Calc


How can we help you?

Mantente informad@ de la actividad de AZTERLAN

¿En qué idioma quieres recibir la información?

Keep up with AZTERLAN’s activity.

Language of preference

Contact Xabier

Contact with Maider Muro

Contact with Dr. Urko de la Torre

Contact with Dra. Anna Regordosa

Contact with Dr. Rodolfo González-Martínez

Contact with Ander Areitioaurtena.

Contact with David Aristondo.

Contact with Juan J. Bravo.

Contact with David Garcia.

Contact with Jose Ramon.

Contact with Oihana.

Keep up with AZTERLAN’s activity.

Language of preference