Relation between Fatigue Strength and Hardness of Maraging Steel

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  • マルエージング鋼の硬さと疲労強度の関係
  • マルエージングコウ ノ カタサ ト ヒロウ キョウド ノ カンケイ

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Abstract

Rotating bending fatigue tests were carried out for maraging steels using specimens heat-treated at different under-aging conditions to prepare specimens with 4 kinds of hardness and the dependence of hardness on fatigue strength was investigated not only for a surface fracture but also for an internal fracture using electro-polished and shot-peened specimens. All surface fracture generated surface fracture under the high stress, when it was shot-peened specimens in case of electro-polished specimens, and internal fracture was generated under the low stress. S-N curve of shot-peened specimens showed two step shape. Hardness dependence of the fatigue strength is evaluated in surface fracture and internal fracture. They not recognize even in Hv670 on the limit in case of the internal fracture, while about Hv600 becomes a limit in case of the surface fracture.

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