Effect of microstructure and cycling frequency on the torsional fatigue properties of 17-4PH stainless steel

In this paper, tensile fatigue properties of 316L stainless steel thin sheets with a thickness of 0.1 mm are studied. The tests are implemented by using micro mechanical fatigue testing sysytem (MMT-250N) at room temperature under tension-tension cyclic loading. The S-N curve of the thin sheets descends continuously at low cycle region. Cyclic σ-N curve and ε-N curve are obtained according to the classical macroscopical fatigue theory. The results agree well with the experimental fatigue data, showing that the traditional fatigue research methods are also suitable for description of MEMS fatigue in a certain extent. The effect factor of frequency was considered in this study and the results show that the fatiuge life and the fatigue strength are increased as loading frequency increasing.

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Effect of Pre-Strain and Roller Working on Torsional Fatigue Properties of a Structural Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.2227 ◽

2011 ◽

Vol 295-297 ◽

pp. 2227-2230

Author(s):

Cong Ling Zhou

Keyword(s):

Residual Stress ◽

Fatigue Limit ◽

Work Hardening ◽

Compressive Residual Stress ◽

Strain Ratio ◽

Fatigue Tests ◽

The Other ◽

Fatigue Properties ◽

Torsional Fatigue ◽

Stress Work

In this study, fatigue tests have been performed using two kinds of specimens made of 25 steel. One is pre-strained specimen with pre-strain ratio changing from 2% to 8% by tension, the other is roller worked with deformation of 0.5 mm and 1.0 mm in diameter direction. In the case of pre-strained specimen, the fatigue limit increases according to increase of tensile pre-strain, the fatigue limit of 8% pre-strained specimen is 25% higher than that of non-pre-strained one; in the case of roller worked specimen, the fatigue limit of R05 and R10 is 126% and 143% to that of non-roller worked specimen, respectively. These remarkable improvements of fatigue limit would be caused by the existence of compressive residual stress, work-hardening and the elongated microscopic structures.

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The Effects of Residual Magnetism on the Corrosion Fatigue Properties of Type 410 Stainless Steel Compressor Blades

CORROSION ◽

10.5006/0010-9312-32.3.109 ◽

1976 ◽

Vol 32 (3) ◽

pp. 109-114

Author(s):

J.D. COLLINS

Keyword(s):

Stainless Steel ◽

Corrosion Fatigue ◽

Fatigue Properties ◽

Compressor Blades ◽

Residual Magnetism

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Tensile Pre-Strain Effects on Torsional Fatigue Properties of Medium Carbon Steels

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.297-300.1126 ◽

2005 ◽

Vol 297-300 ◽

pp. 1126-1132 ◽

Cited By ~ 2

Author(s):

Cong Ling Zhou ◽

Shinichi Nishida ◽

Nobusuke Hattori ◽

Wen Xian Sun

Keyword(s):

Stress Amplitude ◽

Surface Hardness ◽

Strain Ratio ◽

Carbon Steels ◽

Fatigue Properties ◽

Crack Initiation And Propagation ◽

Medium Carbon ◽

Torsional Fatigue ◽

Initiation And Propagation ◽

Medium Carbon Steels

This study was focused on the effects of pre-strain on the torsional fatigue properties of three kinds of medium carbon steels, including the fatigue strength, surface hardness, microstructure, and the crack initiation and propagation behaviors. The effect of pre-strain on the non-propagating cracks was also discussed. The main results obtained in this test are as follows: 1) the fatigue limits increase with the increasing of tensile pre-strain ratio for all kinds of the test materials; 2) under certain stress amplitude, with the increasing of tensile pre-strain ratio, the fatigue crack initiates a little earlier and propagates faster; 3) the length of non-propagating crack decreases with the increasing of tensile pre-strain ratio.

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