TY - JOUR
T1 - Improved fracture toughness of boride coating developed with a diffusion annealing process
AU - Campos-Silva, I.
AU - Flores-Jiménez, M.
AU - Rodríguez-Castro, G.
AU - Hernández-Sánchez, E.
AU - Martínez-Trinidad, J.
AU - Tadeo-Rosas, R.
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 Prof. Francisco Cruz Gandarilla for his valuable contribution to the XRD patterns.
PY - 2013/12/25
Y1 - 2013/12/25
N2 - In this study, the fracture toughness of boride coatings formed at the surface of AISI 1045 steel was improved by means of a diffusion annealing process. First, the boriding of AISI 1045 steel was performed by the powder-pack method at a temperature of 1223. K and a range of exposure times (8-12. h). The diffusion annealing process was conducted on the borided steels at a temperature of 1273. K with 8. h of exposure using a diluent atmosphere of SiC powder and bentonite. To establish the mechanical behavior of the boride coatings developed by both treatments, properties such as the real hardness and the Young's modulus were estimated at 50. μm from the surface using Vickers and Knoop testing, respectively. The fracture toughness of the boride coatings was estimated using a universal crack equation applicable independently of the cracking mode. The boride coating obtained by the boriding process exhibited an intermediate cracking mode, while the coatings obtained by the diffusion annealing process showed a radial-median mode.The effect of the diffusion annealing process on the fracture toughness of the boride coatings revealed an increase of approximately 50% in comparison with the coatings developed by the powder-pack boriding process.
AB - In this study, the fracture toughness of boride coatings formed at the surface of AISI 1045 steel was improved by means of a diffusion annealing process. First, the boriding of AISI 1045 steel was performed by the powder-pack method at a temperature of 1223. K and a range of exposure times (8-12. h). The diffusion annealing process was conducted on the borided steels at a temperature of 1273. K with 8. h of exposure using a diluent atmosphere of SiC powder and bentonite. To establish the mechanical behavior of the boride coatings developed by both treatments, properties such as the real hardness and the Young's modulus were estimated at 50. μm from the surface using Vickers and Knoop testing, respectively. The fracture toughness of the boride coatings was estimated using a universal crack equation applicable independently of the cracking mode. The boride coating obtained by the boriding process exhibited an intermediate cracking mode, while the coatings obtained by the diffusion annealing process showed a radial-median mode.The effect of the diffusion annealing process on the fracture toughness of the boride coatings revealed an increase of approximately 50% in comparison with the coatings developed by the powder-pack boriding process.
KW - Boride coatings
KW - Boriding
KW - Diffusion annealing process
KW - Fracture toughness
KW - Real hardness
KW - Young's modulus
UR - http://www.scopus.com/inward/record.url?scp=84889085773&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2013.05.050
DO - 10.1016/j.surfcoat.2013.05.050
M3 - Artículo
SN - 0257-8972
VL - 237
SP - 429
EP - 439
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -