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Effects of tensile pre-strain on torsional fatigue properties of aging processed carbon steels

Effects of tensile pre-strain on torsional fatigue properties of aging processed carbon steels This study focused on the effects of tensile pre-strain on the torsional fatigue properties of four kinds of structural carbon steels (JIS S15C to S45C). The specimens were tensile pre-strained and aging processed before the torsional fatigue test. The fatigue properties investigated in this study included fatigue strength, crack initiation and propagation behaviors, surface hardness and characteristics of non-propagating crack behaviors. The results indicate that the torsional fatigue strength are improved after tensile pre-strain, the fatigue limits increase with the increasing of pre-strain ratio; tensile pre-strain does not affect the fatigue crack initiation and branch points, the cracks initiate in the weak part of the ferrite grains from the torsional slip lines in the surface and branch at the boundaries of grains, irrespective of ferrite or pearlite grains; for S25C, non-propagating crack is observed on the pre-strained specimens and the length becomes shorter with the increasing of tensile pre-strain ratio. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Strength, Fracture and Complexity IOS Press

Effects of tensile pre-strain on torsional fatigue properties of aging processed carbon steels

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Publisher
IOS Press
Copyright
Copyright © 2005 by IOS Press, Inc
ISSN
1567-2069
eISSN
1875-9262
Publisher site
See Article on Publisher Site

Abstract

This study focused on the effects of tensile pre-strain on the torsional fatigue properties of four kinds of structural carbon steels (JIS S15C to S45C). The specimens were tensile pre-strained and aging processed before the torsional fatigue test. The fatigue properties investigated in this study included fatigue strength, crack initiation and propagation behaviors, surface hardness and characteristics of non-propagating crack behaviors. The results indicate that the torsional fatigue strength are improved after tensile pre-strain, the fatigue limits increase with the increasing of pre-strain ratio; tensile pre-strain does not affect the fatigue crack initiation and branch points, the cracks initiate in the weak part of the ferrite grains from the torsional slip lines in the surface and branch at the boundaries of grains, irrespective of ferrite or pearlite grains; for S25C, non-propagating crack is observed on the pre-strained specimens and the length becomes shorter with the increasing of tensile pre-strain ratio.

Journal

Strength, Fracture and ComplexityIOS Press

Published: Jan 1, 2005

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