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, M. Shimojo, K. Takashima, Y. Higo

Research output: Contribution to journalConference article

1 Citation (Scopus)

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 Mb (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.

Original languageEnglish
Pages (from-to)B3.13.1-B3.13.6
JournalMaterials Research Society Symposium - Proceedings
Volume634
Publication statusPublished - 2001 Jan 1
Externally publishedYes
EventStructure and Mechanical Properties of Nanophase Materials- Theory and Computer Si,ulation v.s Experiment - Boston, MA, United States
Duration: 2000 Nov 282000 Nov 30

Keywords

  • Fatigue life extension
  • Nano-sized α′-martensite
  • Pinning dislocations

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Extension of high cycle fatigue life by the formation of nano-sized martensite particles at intersections of dislocations in an austenitic stainless steel'. Together they form a unique fingerprint.

  • Cite this