微小硬さに及ぼす引張負荷応力の影響

概要

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In order to investigate the influence of applied tensile stress within an elastic limit on the microhardness of an annealed structural rolled steel, hardness tests were made by changing two parameters, hardness test load and final polish. The results obtained were analyzed by means of the analysis of variance The main results obtained were as follows: (1) Without applied tensile stress, the hardness measurement were possible for the conditions of 500 gf・#120, 1000gf・#120, 500gf・#800 and 1000gf・#800. The dispersion of hardness number was minimum for the measuring condition of 1000gf・#800, and the hardness number varied depending upon the hardness test load and the final polish. (2) The hardness number was influenced by the tensile stress for the measuring conditions of 500gf・#120, 1000gf・#120, 500gf・#800 and 1000gf・#800. (3) A linaer relationship existed between the applied tensile stress and the hardness number for the above conditions. The regression coefficients were equal to each other, but the confidence interval decreased with increasing hardness test load and higher grade of final polish. (4) The measuring condition of 1000gf・#800 was best fitted for the case of applied tensile stress because the confidence interval became minimum among all of them.
社団法人日本材料学会の論文
1982-06-15