Fracture Toughness of Thick Boride Layers Estimated by the Cross-Sectioned Scratch Test

Journal Article · Thu Feb 15 04:00:00 EST 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3140-1· OSTI ID:22860643

Flores-Jiménez, M.; Bravo-Bárcenas, D.; Rodríguez-Castro, G.; Martínez-Trinidad, J.; Meneses-Amador, A. ^[1]

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1. SEPI-ESIME, Instituto Politécnico Nacional, Grupo Ingeniería de Superficies (Mexico)

New results about the fracture toughness (K{sub c}) of thick boride layers estimated by the cross-sectioned scratch test are presented in this study. The FeB-Fe{sub 2}B layers developed at the surface of borided AISI 1018 and AISI 1045 steels and the Fe{sub 2}B layer formed on the borided AISI 1045 steel exposed to a diffusion annealing process (DAP) were used for this purpose. The cross-sectioned scratch tests were performed with a Vickers diamond stylus drawn across the thick boride layer under a constant load to produce a half-cone-shaped fracture near to the top surface of the borided steels. The height of the half-cone-shaped fracture as a function of the cross-sectioned scratch loads was used to determine the fracture toughness of the FeB and Fe{sub 2}B layers. The results showed a fracture resistance of ∼2.8 MPa√m for the FeB layer formed at the surface of borided AISI 1045 steel. Likewise, the effect of the DAP on the surface of the borided AISI 1045 steel promoted the formation of an exclusively Fe{sub 2}B layer, with an increase in the fracture toughness of the whole boride layer around 5 MPa√m. Finally, the principle of the technique can be used to minimize the influence of the anisotropic properties on the fracture toughness along the depth of boride layers.

• OSTI ID: 22860643
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 2 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
ANNEALING
CROSS SECTIONS
DIFFUSION
FRACTURE PROPERTIES
FRACTURES
FUNCTIONS
IRON BORIDES
LAYERS
STEELS
SURFACES
VICKERS HARDNESS