軟綱予加工材の疲労課程における塑性変形挙動と転移構造変化

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Push-pull fatigue tests at a constant stress amplitude were carried out on mild steel specimens which were annealed and pre-strained in tension to 1%, 5% and 10% strains. Some relationships between the dislocation structure and the plastic strain range Δε_p or Vickers hardness H_V were investigated during the fatigue process. (1) The dislocation structure induced previously by the prestrain Δε_p. was recovered and rearranged with stress cycling, and became a typical cell structure by fatigue in the later stage. (2), The annealed and the 1% pre-strained specimens in which the total dislocation density ρ_t and H_V increased during the fatigue process showed cyclic hardening. On the other hand, the 5% and the 10% pre-strained specimens in which they decreased showed cyclic softening. (3) The pre-strained specimens showed higher values of Δε_p than that of the annealed one in the initial stage. But, as the amount of ε_<pre> increased the value of the Δε_p became smaller and the number of cycles to the maximum of the Δε_p became larger. (4) The variations of ρ_t for the annealed and the pre-strained specimens during the fatigue process were expressible by the same equation derived from dislocation dynamics. (5) During the fatigue process, the relationship between H_V and ρ_t was expressed as a simple relation, H_V ∝ √<ρ_t>. (6) A mean cell size L_m at a fatigue failure point did not depend on ε_<pre>, but on the stress amplitude or the number of cycles to failure.
社団法人日本材料学会の論文
1981-11-15

軟綱予加工材の疲労課程における塑性変形挙動と転移構造変化

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