軟鋼のころがり疲労に及ぼす溶体化処理温度の影響

概要

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The effect of solution treatment temperature on the rolling contact fatigue strength of mild steel with carbon 0.17%, was studied by using specimens which were annealed, age-hardened at room temperature (20℃) after keeping for 20 minutes at solution temperatures of 700℃, 650℃, 600℃ and 500℃, and tempered at 670℃ to have almost the same hardness as the specimen solution treated at 700℃. Rolling contact fatigue tests were carried out with each pair of the same specimens by a Nishihara-type wear testing machine under pure rolling contact with lubricant. The results obtained are as follows ; (1) The rolling contact fatigue strength of rolled steel for general structure (SS34) is increased markedly by the age-hardening treatment. (2) In order to produce the maximum rolling contact fatigue endurance limit of rolled steel for general structure (SS34), a solution treatment temperature of 600℃ is necessary. (3) The propagation depth of crack formed in rolled steel for general structure by repeated con-tact stress tends to be in the vicinity of the region (Z_0) where the maximum shear stress value becomes maximum.
社団法人日本材料学会の論文
1992-09-15