Characterization and Fracture Toughness on AISI 8620 with Hard Coatings


Article Preview

The present studies characterize and evaluate the fracture toughness at the surface AISI 8620 with hard coating. The hard coatings FeB and Fe2B were formed using the boriding dehydrated paste at temperatures 1223 and 1273 K with 6 and 8 h exposure time, respectively. The presence of hard coatings formed on the surface AISI 8620 were confirmed by the classical metallographic technique combined with X-ray diffraction analysis. The distribution of alloying elements was determined by Energy Dispersive Spectroscopy (EDS). The fracture toughness of the hard coatings on AISI 8620 was estimated using a Vicker microindentation induced fracture testing of 15 and 35 μm from the surface, applying four load (0.49, 0.98,1.96 and N). The microcrack generated at the corner of the microindentation was considered as an experimental parameter and the tree model Palmqvist crack model was employed to determine the fracture toughness. The adherence of the hard coatings/substrate was evaluate in qualitative form though the VDI 3198 by testing Rockwell C and observed by Scanning Electron Microscopy (SEM). The formation of hard layers was obtained in the range of 100-130 μm, results of XRD present phases FeB, Fe2B, CrB and MnB, the values obtained of Kc are in the range of 2.3 to 4.1 MPam1⁄2 and results of acceptable adhesion HF4 patterns for conditions 6 h of treatment



Edited by:

Prof. Andreas Öchsner, Prof. Graeme E. Murch, Ali Shokuhfar and J.M.P.Q. Delgado




M.A. Doñu Ruiz et al., "Characterization and Fracture Toughness on AISI 8620 with Hard Coatings", Defect and Diffusion Forum, Vol. 369, pp. 89-94, 2016

Online since:

July 2016




* - Corresponding Author

[1] J.R. Davis, Surface Hardening of Steels: Understanding the Basics, ASM International, Ohio, 1st edn (2002).

[2] D. K. Shetty, I. G. Wright, P. N. Mincer, A. H. Clauer. Indentation fracture of WC-Co cermets. Journal of Materials Science 20 (1985) 1873-1882.


[3] K. Niihara. A fracture mechanics analysis of indentation –induced Palmqvist crack in ceramics. Journal of Materials Science Letters 2 (1983) 221-223.


[4] M. T. Laugier. New formula for indentation toughness in ceramics. Journal of Materials Science Letters 6 (1987) 355-356.

[5] Sanchez-Huerta, D., De la Mora-Ramírez, T., Doñu-Ruiz, M. A., López-Perrusquia, N., & Cortés-Suarez, J. V, Characterization of Adherence Steels Hardened Superficially. In MRS Proceedings (Vol. 1616, pp. imrc2013-s5c). . (2014, January). Cambridge University Press.


[6] The VDI 3198 IndentationTest Evaluation of a Reliable Qualitative Control for Layered Compounds, J. Mater. Process. Technol., 2003, 143-144, pp.481-485.

[7] Gunes, I., S. Ulker, and S. Taktak. Plasma paste boronizing of AISI 8620, 52100 and 440C steels., Materials & Design 32. 4 (2011): 2380-2386.


[8] An, J., Li, C., Wen, Z., Yang, Y. L., & Sun, S. J. (2012). Study of boronizing of steel AISI 8620 for sucker rods. Metal Science and Heat Treatment, 1-5.

[9] Gunes, I., TAKTAK, I., Bindal, C., Yalcin, Y., Ulker, S., & Kayali, Y. (2013). Investigation of diffusion kinetics of plasma paste borided AISI 8620 steel using a mixture of B2O3 paste and B4C/SiC. Sadhana, 38(3), 513-526.


[10] C. Bindal and A.H. Ucisik, Characterization of Borides Formed on Impurity-Controlled Chromium-Based Low Alloy Steels, Surf. Coat. Technol., 1999, 122, pp.208-213.


[11] N. Lopez-Perrusquia, M. A. Doñu-Ruiz, V. Cortes Suarez, D. Sánchez-Huitron, E.Y. Vargas-Oliva, I. J. Perez Montes De Oca, Evaluation Hard Layers in Steel AISI 8620, Advanced Materials Research, Vols. 690-693, pp.2055-2058, May. (2013).


[12] N. López-Perrusquia, M. A. Doñu-Ruíz, F. Vasquez, O. Trujillo-Alfaro, Y. E. Vargas-Oliva, Study of Adhesion in Steels Surface Hardened, Advanced Materials Research, Vols. 535-537, pp.513-516, Jun. ( 2012).


[13] Sukru Taktak. Some mechanical properties of borided AISI H13 and 304 steels. Materials and Design 28 (6) (2007) 1836-1843.


Fetching data from Crossref.
This may take some time to load.