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Extension of High Cycle Fatigue Life by the Formation of Nano-Sized Martensite Particles at Intersections of Dislocations in an Austenitic Stainless Steel

  • T. Inamura (a1), M. Shimojo (a1), K. Takashima (a1) and Y. Higo (a1)

Abstract

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 (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.

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Keywords

Extension of High Cycle Fatigue Life by the Formation of Nano-Sized Martensite Particles at Intersections of Dislocations in an Austenitic Stainless Steel

  • T. Inamura (a1), M. Shimojo (a1), K. Takashima (a1) and Y. Higo (a1)

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