TY - JOUR
T1 - Effect of the anisotropic growth on the fracture toughness measurements obtained in the Fe2B layer
AU - Hernández-Sanchez, E.
AU - Rodriguez-Castro, G.
AU - Meneses-Amador, A.
AU - Bravo-Bárcenas, D.
AU - Arzate-Vazquez, I.
AU - Martínez-Gutiérrez, H.
AU - Romero-Romo, M.
AU - Campos-Silva, I.
N1 - Funding Information:
This work was supported by research grants 150556 and 183836 of the National Council of Science and Technology , and research grants 20130534 and 20130674 of the Instituto Politécnico Nacional in Mexico . The authors would like to thank Dr. Maria de los Angeles Hernández Pérez for her assistance in XRD analysis (IPN, SEPI-ESIQIE).
PY - 2013/12/25
Y1 - 2013/12/25
N2 - In this study, the fracture toughness of the Fe2B layer was estimated using the Berkovich indentation technique. Boron diffusion at the surface of the AISI 1018 steel was conducted using a powder-pack boriding process at a temperature of 1273K with 6h of exposure. The mechanical characterization of the Fe2B layer was performed on three different distances from the surface using a range of indentation loads (10 to 500mN) for each distance. The behavior of the hardness as a function of the indentation load showed the presence of the indentation size effect (ISE) at the different distances from the surface, in which the apparent or real hardness was estimated according to the concept of the Nix and Gao model. Finally, two indentation-cracking models were used to estimate the fracture toughness of the Fe2B layer on the different distances from the surface; the results were ranged from 1.5 to 4.2 MPa m1/2, which denoted the brittleness and the influence of the anisotropic nature of the boride layer.
AB - In this study, the fracture toughness of the Fe2B layer was estimated using the Berkovich indentation technique. Boron diffusion at the surface of the AISI 1018 steel was conducted using a powder-pack boriding process at a temperature of 1273K with 6h of exposure. The mechanical characterization of the Fe2B layer was performed on three different distances from the surface using a range of indentation loads (10 to 500mN) for each distance. The behavior of the hardness as a function of the indentation load showed the presence of the indentation size effect (ISE) at the different distances from the surface, in which the apparent or real hardness was estimated according to the concept of the Nix and Gao model. Finally, two indentation-cracking models were used to estimate the fracture toughness of the Fe2B layer on the different distances from the surface; the results were ranged from 1.5 to 4.2 MPa m1/2, which denoted the brittleness and the influence of the anisotropic nature of the boride layer.
KW - Anisotropy growth
KW - Boriding
KW - Brittleness
KW - Cracking models
KW - Fracture toughness
KW - Real hardness
UR - http://www.scopus.com/inward/record.url?scp=84889099549&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2013.09.064
DO - 10.1016/j.surfcoat.2013.09.064
M3 - Artículo
SN - 0257-8972
VL - 237
SP - 292
EP - 298
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -