Fatigue Limit Prediction of the Matrix of 17-4PH Stainless Steel Based on Small Crack Mechanics

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Defu Nie ◽  
Yoshiharu Mutoh
Keyword(s):  
Stainless Steel ◽  
Fatigue Limit ◽  
High Strength Steel ◽  
High Stress ◽  
High Strength ◽  
Fatigue Tests ◽  
Small Crack ◽  
A Value ◽  
Crack Mechanics ◽  
The Matrix

The experimentally obtained fatigue limit of high strength steel is generally a value reduced by inherent flaws, and such a value does not characterize the resistance of the matrix of high strength steel to cyclic loading. To investigate the fatigue limit of the matrix, fatigue tests of 17-4PH stainless steel were performed. 17-4PH stainless steel showed a distinct dual-stage S-N curve: one stage corresponding to high stress where crack initiated at the surface and another stage corresponding to low stress where crack initiated from the subsurface inclusion (Al2O3). Based on small crack mechanics, a model was proposed to predict the fatigue limit of the matrix of 17-4PH stainless steel and its validity has been discussed.

Fatigue Limit Prediction of SUS630 Stainless Steel Matrix Based on Small Crack Mechanics

2012 ◽  
Author(s):  
Defu Nie ◽  
Yoshiharu Mutoh
Keyword(s):  
Stainless Steel ◽  
Fatigue Limit ◽  
High Strength Steel ◽  
High Stress ◽  
High Strength ◽  
Fatigue Tests ◽  
Small Crack ◽  
Steel Matrix ◽  
Crack Mechanics ◽  
Dual Stage

The experimentally obtained fatigue limit of high strength steel is generally a value reduced by inherent flaws, which does not characterize the resistance of high strength steel matrix to cyclic loading. To investigate the fatigue limit of matrix, fatigue tests of SUS630 stainless steel were performed. SUS630 stainless steel showed a distinct dual-stage S-N curve: one stage corresponding to high stress where crack initiated at the surface and another stage corresponding to low stress where crack initiated from the subsurface inclusion (Al2O3). Based on small crack mechanics, a model was proposed to predict the fatigue limit of SUS630 stainless steel matrix. Moreover, fatigue tests of blunt notch specimens were performed to examine the validity of this model.

scholarly journals On the Influence of Ultrasonic Surface Mechanical Attrition Treatment (SMAT) on the Fatigue Behavior of the 304L Austenitic Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 100 ◽  
Author(s):  
Clément Dureau ◽  
Marc Novelli ◽  
Mandana Arzaghi ◽  
Roxane Massion ◽  
Philippe Bocher ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Fatigue Limit ◽  
Room Temperature ◽  
Fatigue Behavior ◽  
High Stress ◽  
Fatigue Tests ◽  
Surface Mechanical Attrition Treatment ◽  
Self Heating ◽  
Mechanical Attrition

The potential of ultrasonic surface mechanical attrition treatment (SMAT) at different temperatures (including cryogenic) for improving the fatigue performance of 304L austenitic stainless steel is evaluated along with the effect of the fatigue loading conditions. Processing parameters such as the vibration amplitude, the size, and the material of the shot medias were fixed. Treatments of 20 min at room temperature and cryogenic temperature were compared to the untreated material by performing rotating–bending fatigue tests at 10 Hz. The fatigue limit was increased by approximately 30% for both peening temperatures. Meanwhile, samples treated for 60 min at room temperature were compared to the initial state in uniaxial fatigue tests performed at R = −1 (fully reversed tension–compression) at 10 Hz, and the fatigue limit enhancement was approximately 20%. In addition, the temperature measurements done during the tests revealed a negligible self-heating (∆t < 50 °C) of the run-out specimens, whereas, at high stress amplitudes, temperature changes as high as 300 °C were measured. SMAT was able to increase the stress range for which no significant local self-heating was reported on the surface.

A fatigue comparison of high strength steel, stainless steel and titanium in a simulated ocean environment

JOM ◽  
1978 ◽  
Vol 30 (5) ◽  
pp. 15-20
Author(s):  
J. E. Beach ◽  
N. V. Marchica ◽  
L. L. Ichter
Keyword(s):  
Stainless Steel ◽  
High Strength Steel ◽  
High Strength ◽  
Ocean Environment

Studying the Effect of Manganese Content on TRIP Advanced High Strength Steel

2019 ◽  
Vol 950 ◽  
pp. 50-54 ◽  
Author(s):  
Ahmed El-Sherbiny ◽  
Ahmed Y. Shash ◽  
Mohamed Kamal El-Fawkhry ◽  
Tarek M. El-Hossainy ◽  
Taha Mattar
Keyword(s):  
High Strength Steel ◽  
Retained Austenite ◽  
Manganese Content ◽  
High Strength ◽  
Uniaxial Tensile ◽  
Strain Hardening Exponent ◽  
Uniaxial Tensile Test ◽  
Advanced High Strength Steel ◽  
High Manganese ◽  
The Matrix

TRIP effect containing steel was well reputed by its high mechanical properties among the 1st generation of Advanced High Strength Steel. High Silicon content was well established as an inhibitor for cementite precipitation at para-equilibrium condition. However, the effect of manganese as a powerful stabilizer for retained austenite was not much studied in TRIP-Steel. Thereby, the effect of high manganese content on the TRIP containing steel is studied in this research. As been observed from OM, and XRD results, it was found that as long as increasing Manganese content, the fraction of retained austenite increases. No doubt that enrichment of retained austenite throughout the matrix, beers a great impact on the plastic deformation character of the investigated steels, which was proved by using a uniaxial tensile test and determining the strain hardening exponent.

Effect of Roller-Working on Fatigue Strength Improvement of Notched Structural Stainless Steel

2006 ◽  
Vol 306-308 ◽  
pp. 151-156
Author(s):  
Priyo Tri Iswanto ◽  
Shinichi Nishida ◽  
Nobusuke Hattori ◽  
Yuji Kawakami
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Fatigue Limit ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Mean Stress ◽  
Increase With Increase ◽  
Fatigue Strength Improvement ◽  
Rolled Specimen ◽  
Number Of Cycles

In order to study the effect of plastic deformation on fatigue behaviors of plastically deformed specimen, bending fatigue tests had been performed on notched deformed stainless steel specimens. Also pulsating fatigue tests were done on notched non-deformed specimens to evaluate the influence of mean stress on fatigue behavior of notched non-deformed specimens. The result showed that according to increase of deformation value, the fatigue limits of these specimens also significantly increase. Fatigue limit of rolled specimen does not linearly increase with increase in plastic deformation value. Based on fatigue limit diagram, the effect of compressive residual stress on fatigue limit improvement of stainless steel is higher than that of work-hardening. In case of non-deformed specimen, when the compressive mean stress increases, the fatigue limit and the number of cycles to failure increase. In case of tensile mean stress, this kind of mean stress decreases the fatigue limit.

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