イオン注入マルテンサイト系ステンレス鋼の疲労強度改善効果および超微小硬度計を用いた表面硬度評価

概要

論文の詳細を見る
The effect of surface modification by ion implantation on the fatigue strength of 13Cr martensitic stainless steel was first described. Then the relationship between the fatigue performance and the surface microhardness of the material was dealt with. N^+ ions were implanted into the specimen surface with doses in the range of 5×10^<13> ions/cm^2〜5×10^<17> ions/cm^2 with energy level of 350 keV. The results of out-of-plane bending fatigue tests revealed that the fatigue strength was improved by the ion implantation with implantation doses more than 2×10^<17> ions/cm^2, and that the further increase of fatigue strength was attained by the post heat treatment following the ion implantation. The microhardness of ultra-thin surface layer of submicron order was evaluated by the method previously proposed by the authors. The results indicated that the surface layer was hardened by the ion implantation and the hardness was increased by the post heat treatment. A remarkable increase in hardness was observed at the surface layer after the fatigue test, and this increase of the microhardness well coincides with the improvement of fatigue strength by ion implantation and post heat treatment.
社団法人日本材料学会の論文
1995-02-15