A new fatigue strengthening method which is applicable for both the micro-sized materials and ordinary-sized materials have been proposed. Dislocations are pinned at their intersections by the formation of nano-crystals after cold work in this strengthening method. Nano-sized α′-martensite particles, the diameter of which was approximately 5 nm, were formed by a cryogenic treatment at a certain temperature above Msαb (martensite burst starting temperature) in a commercially available 316-type austenitic stainless steel. These nano-particles are considered to be formed at intersections of dislocations. Fatigue life tests using ordinary-sized specimens revealed that high cycle fatigue life of the 316-type austenitic stainless steel was extended by the cryogenic treatment and this is considered to be due to the pinning of dislocations by the formation of nano-sized α′-martensite particles.
|ジャーナル||Materials Research Society Symposium - Proceedings|
|出版ステータス||Published - 2001|
|イベント||Structure and Mechanical Properties of Nanophase Materials- Theory and Computer Si,ulation v.s Experiment - Boston, MA, United States|
継続期間: 2000 11 28 → 2000 11 30
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