Application of Statistical Criteria for Checking the Homogeneity of Dispersions of Results of Fatigue Tests of Heat-Resistant Alloys Produced by Selective Laser Melting

The results of fatigue tests of smooth cylindrical specimens under full deformation control at elevated temperature of two heat-resistant alloys are presented. A comparative analysis of parametric criteria of homogeneity of variances (Bartlett test, Levene test, Brown–Forsythe test) was carried out. For a reasonable approximation by the regression line of the results of fatigue tests of the VZh159 high-temperature alloy, Bartlett test was used. The use of Brown–Forsythe statistics for the results of fatigue tests of an alloy of the Co–Cr–Ni–W–Ta system makes it possible to observe pronounced static differences in selective loading levels.