Assessment of High-Temperature Low-Cycle Fatigue Life of Austenitic Stainless Steels by Using Intergranular Damage as a Correlating Parameter

2009 ◽  
pp. 169-169-25 ◽  
Author(s):  
C Levaillant ◽  
A Pineau
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Stainless Steels ◽  
Low Cycle Fatigue ◽  
Austenitic Stainless Steels ◽  
Cycle Fatigue

Low-Cycle Fatigue Behavior of TP347H Austenitic Stainless Steels at Room Temperature

2013 ◽  
Vol 815 ◽  
pp. 875-879 ◽  
Author(s):  
Hong Wei Zhou ◽  
Yi Zhu He ◽  
Yu Wan Cen ◽  
Jian Qing Jiang
Keyword(s):  
Fatigue Life ◽  
Stainless Steels ◽  
Room Temperature ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Fatigue Cracks ◽  
Austenitic Stainless Steels ◽  
Fracture Morphology ◽  
Cycle Fatigue ◽  
Response Curves

Low-cycle fatigue (LCF) tests were performed with different strain amplitudes from 0.4% to 1.2% at room temperature (RT) to investigate fatigue life and fracture morphology of TP347H austenitic stainless steels. The results show that there is initial cyclic hardening for a few cycles, followed by continuous softening until fatigue failure at all strain amplitudes in stress response curves. The fatigue life of the steels follows the strain-life Coffin-Manson law. Fracture morphology shows that fatigue cracks initiate from the specimen free surface instead of the interior of the specimen, and ductile fracture appears during LCF loading. More sites of crack initiation and quicker propagation rate of fatigue crack at high strain amplitudes than those at low strain amplitudes are responsible for reduced fatigue life with the increasing of strain amplitude.

Parameter Analysis for Time-Dependent Low-Cycle Fatigue Life

1994 ◽  
Vol 116 (4) ◽  
pp. 479-482 ◽  
Author(s):  
Koji Yamaguchi ◽  
Kazuo Kobayashi ◽  
Kiyoshi Ijima ◽  
Satoshi Nishijima
Keyword(s):  
Fatigue Life ◽  
Strain Rate ◽  
Low Cycle Fatigue ◽  
Austenitic Stainless Steels ◽  
Original Data ◽  
Parameter Analysis ◽  
304 Stainless Steel ◽  
Cycle Fatigue ◽  
Well Test ◽  
Design Code

Temperature and strain rate dependences of low-cycle fatigue life can be represented by a modified Larson-Miller parameter. The parameter P is written by P=T(logN25−Alog ε˙ + B), where T is temperature, N25 is fatigue life, ε˙ is strain rate, and A and B are constants. In the analysis, each data of several kinds of engineering materials from ferritic steels to austenitic stainless steels are used. These are the authors original data published in the documents of NRIM Fatigue Data Sheets. The result of 304 stainless steel has been compared with statistical analysis result by Diercks adopted in a design code. The fatigue life curves represented by the proposed parameter analysis fitted well test data in high-cycle region as well as ones in low-cycle region.

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