微小硬さに及ぼす負荷応力および表面粗さの影響に関する統計的研究

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, carbon steel and carbon tool steel, hardness tests were made by changing two parameters, indentation load and surface roughness due to final polish. The results obtained were analyzed by means of the analysis of variance. The main results obtained were as follows; (1) The microhardness number were influenced by the applied tensile stress for the measuring conditions of indentation load and surface roughness due to final polish. The errors of each measuring condition were unequal each other but the dispersions of each applied tensile stress were equal each other. (2) A linear relationship existed between the applied tensile stress and microhardness number. The regression coefficients were unequal each other, but were equal each other for the measuring conditions of independent of indentation load. The errors for the measuring condition of independent of indentation load were unequal each other. (3) The regression coeffcients of regression line for applied compressive stress and tensile stress were unequal each other. (4) It became clear that the applied tensile stress and compressive stress were closely connected with load dependence of microhardness.
東海大学の論文