To prevent failure of machine components it is necessary to measure material damage generated in a component throughout its entire lifetime. Damage can be quantified by means of damage parameters. This paper considers the usefulness of hardness measurements to evaluate damage parameter in Inconel 718. Vickers hardness tests were performed on a specimen with a variable cross section area after tensile testing. The specimen’s geometry enabled the evaluation of damage parameter in respect of hardness measurements made on one individual specimen.
 G.H. Majzoobia, F. Rahimi Dehgolan “Determination of the constants of damage model”, Procedia Engineering 10 (2011) 764–773.
 A. Mkaddem, R. Hambli, A. Potiron (2004). Comparison between Gurson and Lemaitre damage models in wiping die bending processes, Int J Adv Manuf Technol Vol. 23: 451–461.
 J. Lemaitre „A Course on Damage Mechanics”, Springer-Verlag Berlin Heidelberg in 1996.
 G. Socha, B. Madejski, J. Krysztofik, S. Czarnewicz “Test method of structural damages caused by permanent deformation of the alloy in the test sample by tensile test and the sample to test damage of the alloy structure”, Patent pending no. P-409294, Urząd Patentowy RP.
 W. Zheng, X. Wei, Z. Song, Q Yong, H. Feng, Q. Xie “Effects off Carbon Content on Mechanical Properties off Inconel 718 Alloy”, Journal Of Iron And Steel Research, International. 2015, 22(1):78-83.
 M. Jutras “Improvement of the Characterisation Method of the Johnson-Cook Model”, FACULTÉ DES SCIENCES ET DE GÉNIE UNIVERSITÉ LAVAL QUÉBEC 2008.
 ASTM 384-11e1 “Standard Test Method for Knoop and Vickers Hardness of Materials”.
 A. Mkaddem, R. Bahloul, P. Dal Santo, A. Potiron “Experimental characterisation in sheet forming processes by using Vickers micro-hardness technique”, Journal of Materials Processing Technology 180 (2006) 1–8.
 G. R. Johnson, W. H. Cook (1985). Fracture Characteristics of Three Metals Subjected to Various Strains, Strain Rates, Temperatures And Pressures, Engineering Fracture Mechanics Vol. 21, No. I, pp. 3148. 1985.
 Jean Lemaitre Rodrigue Desmorat „Engineering Damage Mechanics”, Springer-Verlag Berlin Heidelberg 2005.
 Tadeusz Pelczyński „The hardness of metals and alloys including the physics of plastic deformation” –monograph 2008; Polish.