scholarly journals Formation of Low-Cycle Fatigue Cracks at Annealing Twin Boundaries of Austenitic Stainless Steels

1978 ◽  
Vol 44 (386) ◽  
pp. 3315-3321
Author(s):  
Kenji KANAZAWA ◽  
Koji YAMAGUCHI ◽  
Kazuo KOBAYASHI
Keyword(s):  
Stainless Steels ◽  
Low Cycle Fatigue ◽  
Fatigue Cracks ◽  
Austenitic Stainless Steels ◽  
Annealing Twin ◽  
Cycle Fatigue ◽  
Twin Boundaries

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.

scholarly journals The Effects of Carbon on Low Cycle Fatigue Softening of Austenitic Stainless Steels

1988 ◽  
Vol 74 (2) ◽  
pp. 373-379
Author(s):  
Koji SHIBATA ◽  
Masahiko KOGITA ◽  
Cheng-shu CHEN ◽  
Toshio FUJITA
Keyword(s):  
Stainless Steels ◽  
Low Cycle Fatigue ◽  
Austenitic Stainless Steels ◽  
Cycle Fatigue

Low Cycle Fatigue Behavior in Air and in PWR Water of Type 304L and 316L Austenitic Stainless Steels Manufactured by Hot Isostatic Pressing Process

2015 ◽  
Author(s):  
Laurent De Baglion ◽  
Denis Cedat ◽  
Pascal Ould ◽  
Walter-John Chitty
Keyword(s):  
Stainless Steels ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Hot Isostatic Pressing ◽  
Austenitic Stainless Steels ◽  
Nuclear Industry ◽  
Cycle Fatigue ◽  
Pressurized Water ◽  
Isostatic Pressing ◽  
Pressing Process

Because “safety” is still the key point in the Nuclear industry, more than in any others, the use of new materials or new manufacturing methods is really challenging. Among many characterizations required for a new steel grade or a new manufacturing process to be accepted and then introduced in a Nuclear design code, the fatigue properties must be determined with great care. Nowadays, the consideration of the Pressurized Water Reactor (PWR) primary water environment effect on the Low Cycle Fatigue (LCF) behavior of Austenitic Stainless Steels (ASS’s) is an important issue for both Nuclear Power Plants (NPP) lifetime extensions and new builds as described in the NUREG/CR-6909 [1], [2]. This paper aims to present the LCF behaviors in air and in PWR water at 300°C of type 304L and 316L ASS’s manufactured by Powder Metallurgy coupled with Hot Isostatic Pressing process (PM/HIP) and to compare them with those observed on usual ASS nuclear grade products [3]-[6]. As already introduced in our previous paper [7] dedicated only to the PM/HIP 304L steel fatigue behavior, it appears that the microstructures, mechanical properties and LCF behaviors in air and in PWR water of both type 304L and 316L steels manufactured by PM/HIP process are better or at least similar to those observed on wrought ASS’s.

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