Fe-Cフェライト二元合金におけるコーキシング効果発現因子:ひずみ時効現象に注目して

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タイトル別名
  • Intrinsic Factors That Trigger the Coaxing Effect in Binary Fe-C Ferritic Alloys with a Focus on Strain Aging
  • Fe-Cフェライト ニゲン ゴウキン ニ オケル コーキシング コウカ ハツゲン インシ : ヒズミ ジコウ ゲンショウ ニ チュウモク シテ

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<p>The coaxing effect has been recognized as a phenomenon that enhances the fatigue resistance associated with work hardening and strain-age hardening. To uncover the intrinsic factors that affect the degree of coaxing effect, rotating bending fatigue tests including a process of stepwise stress increases every 107 cycles were carried out at ambient temperature in interstitial free steel and binary Fe-C ferritic alloys. The effects of the work hardening capacity, aging time, stress amplitude increment, and carbon concentration were examined in this simple alloy system. The work hardening capacity was changed by controlling carbon state in a Fe-0.017C (wt%) steel. However, the degree of coaxing effect did not show a significant correlation with work hardening capacity. For the effect of aging time, a fatigue test at a high stress amplitude was interrupted, aged for 2 weeks, and subsequently restarted. Although this process is sufficient to induce strain-age hardening in terms of aging time and plastic strain, a fatigue life of the aged steel was not comparable to that with the coaxing effect. Moreover, an increase in stress increment for each step deteriorated a degree of coaxing effect. It was concluded that the effect of work hardening is minor, and the other factors affecting strain-age hardening must be optimized simultaneously to show a coaxing effect. In addition, the degree of coaxing effect of smooth steel specimens was predominantly controlled by the intergranular fatigue crack initiation behavior. Consequently, a considerable amount of solute carbon and an alternate process for the stress amplitude increment and aging time are required for strain-age hardening that suppresses intergranular fatigue crack initiation.</p>

収録刊行物

  • 鉄と鋼

    鉄と鋼 103 (11), 660-666, 2017

    一般社団法人 日本鉄鋼協会

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