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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

Published online by Cambridge University Press:  14 March 2011

T. Inamura ,
M. Shimojo ,
K. Takashima  and
Y. Higo
T. Inamura
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
M. Shimojo
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
K. Takashima
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
Y. Higo
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
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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.

Keywords

fatigue life extensionpinning dislocationsnano-sized α'-martensite
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 634: Symposium B – Structure and Mechanical Properties of Nanophase Materials-Theory & Computer Simulations vs. Experiment , 2000 , B3.13.1
Copyright
Copyright © Materials Research Society 2001

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References

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