Influence of the Martensitic Transformation on the Fatigue Life of Austenitic Stainless Steels

2009 ◽  
Vol 423 ◽  
pp. 99-104
Author(s):  
Gemma Fargas ◽  
Marc Anglada ◽  
Antonio Mateo
Keyword(s):  
Fatigue Life ◽  
Martensitic Transformation ◽  
Stainless Steels ◽  
Stress Ratio ◽  
Fatigue Testing ◽  
High Stress ◽  
Austenitic Stainless Steels ◽  
Torsion Angles ◽  
Stress Ratios ◽  
Positive Effect

The martensitic transformation in austenitic stainless steels can be induced by plastic deformation at room temperature. The benefit of this transformation is commonly used to strengthen stainless steels grades, i.e. their yield and tensile resistance can be adjusted according to the requirement by cold rolling. In this paper, the martensitic transformation was induced by means of torsion deformation. Several torsion angles were selected to achieve different percentages of martensite at the surface of the specimens and then the effect on the fatigue life of the steel was studied. Fatigue testing results showed dissimilar behavior depending on the stress ratio (R) applied during the test. As a conclusion, the presence of martensite in the surface increases the fatigue life for high stress ratios (R=0.8), while at low R values martensitic transformation has no positive effect.

Techniques for Fatigue Testing and Extrapolation of Fatigue Life for Austenitic Stainless Steels

1982 ◽  
Vol 10 (3) ◽  
pp. 115
Author(s):  
R Horstman ◽  
KA Peters ◽  
RL Meltzer ◽  
M Bruce Vieth ◽  
MJ Manjoine ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Stainless Steels ◽  
Fatigue Testing ◽  
Austenitic Stainless Steels

Crack growth analysis for rice husk reinforced polypropylene composite using equivalent initial flaw size concept

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 4963-4985
Author(s):  
Sity Ainy Nor Mohamed ◽  
Edi Syams Zainudin ◽  
S. M. Sapuan ◽  
Mohd Azaman Md. Deros ◽  
Ahmad Mubarak Tajul Arifin
Keyword(s):  
Fatigue Life ◽  
Crack Growth ◽  
Rice Husk ◽  
Stress Ratio ◽  
High Stress ◽  
Propagation Rate ◽  
Crack Size ◽  
Natural Fibre ◽  
Polypropylene Composite ◽  
Stress Ratios

Crack growth that takes place in natural fibre polymer composite formations is dependent on several factors, whereby primary crack size is a key aspect that influences uncertainty of the crack growth. The nucleation stage is strongly affected by the fracture collapse of structures, unavoidably affecting the accuracy of the estimation of total fatigue life. In this research, fatigue crack was examined using rice husk/polypropylene composite specimens across stress loads ranging from 80 to 90% for ultimate tensile strength at the stress ratios R=0.1, 0.3, and 0.5. Consequently, the propagation rate of the crack was dependent on the stress ratio. Crack resistance showed a drop in the propagation rate of the crack rate with an increase in the R value. This effect produced more fibres/matrix fracture at high stress ratio, in comparison to the low stress ratio, which was verified further through scanning electron microscopy. Moreover, the S-N curve method was proposed, as it facilitates the deterministic total fatigue life discovery in a highly favorable manner via equivalent crack size approach. A strong consensus was observed between the model of prediction and the outcomes of the experiment.

Technological application of the martensitic transformation of some austenitic stainless steels

1989 ◽  
Vol 60 (10) ◽  
pp. 464-468 ◽  
Author(s):  
Ulrich Reichel ◽  
Brunhild Gabriel ◽  
Martin Kesten ◽  
Birgitt Meier ◽  
Winfried Dahl
Keyword(s):  
Martensitic Transformation ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Technological Application

Plasticity and Strain Induced Martensitic Transformation in Two Austenitic Stainless Steels

ICOMAT ◽  
2013 ◽  
pp. 341-348 ◽  
Author(s):  
Stephanie Nanga ◽  
Andre Pineau ◽  
Benoît Tanguy ◽  
Loïc Nazé ◽  
Pierre-Olivier Santacreu
Keyword(s):  
Martensitic Transformation ◽  
Stainless Steels ◽  
Austenitic Stainless Steels

Proposal of Fatigue Life Equations for Carbon and Low-Alloy Steels and Austenitic Stainless Steels as a Function of Tensile Strength

2013 ◽  
Author(s):  
Hiroshi Kanasaki ◽  
Makoto Higuchi ◽  
Seiji Asada ◽  
Munehiro Yasuda ◽  
Takehiko Sera
Keyword(s):  
Tensile Strength ◽  
Fatigue Life ◽  
Stainless Steels ◽  
Room Temperature ◽  
Austenitic Stainless Steels ◽  
Low Alloy Steels ◽  
Strength Based ◽  
Fatigue Data ◽  
Current Design ◽  
Alloy Steels

Fatigue life equations for carbon & low-alloy steels and also austenitic stainless steels are proposed as a function of their tensile strength based on large number of fatigue data tested in air at RT to high temperature. The proposed equations give a very good estimation of fatigue life for the steels of varying tensile strength. These results indicate that the current design fatigue curves may be overly conservative at the tensile strength level of 550 MPa for carbon & low-alloy steels. As for austenitic stainless steels, the proposed fatigue life equation is applicable at room temperature to 430 °C and gives more accurate prediction compared to the previously proposed equation which is not function of temperature and tensile strength.

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