The Effect of Delta-Ferrite in P92 Steel on the Formation of Laves Phase and Cavities for the Reduction of Low Cycle Fatigue and Creep-Fatigue Life

2005 ◽  
pp. 463-470
Author(s):  
Jung Woong Baek ◽  
Soo Woo Nam ◽  
Byeong Ook Kong ◽  
Seog Hyeon Ryu
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Laves Phase ◽  
Cycle Fatigue ◽  
Delta Ferrite ◽  
P92 Steel ◽  
Creep Fatigue

A Model for Predicting Low Cycle Fatigue Life under Creep-Fatigue Interaction

2009 ◽  
pp. 313-313-16 ◽  
Author(s):  
K-T Rie ◽  
R-M Schmidt ◽  
B Ilschner ◽  
SW Nam
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Creep Fatigue

Effect of Hydrostatic Stress on Low Cycle Fatigue Life

2005 ◽  
Author(s):  
Masao Sakane ◽  
Takamoto Itoh
Keyword(s):  
Fatigue Life ◽  
Tensile Stress ◽  
Low Cycle Fatigue ◽  
Hydrostatic Stress ◽  
Creep Rupture ◽  
Rupture Time ◽  
Cycle Fatigue ◽  
Creep Fatigue ◽  
Strain Relationship ◽  
Reversed Loading

This paper overviews the effect of hydrostatic stress on the static tensile stress-strain relationship, low cycle fatigue life, creep rupture time and creep-fatigue life at room and elevated temperatures. There was almost no influence of the hydrostatic stress on the tensile stress-strain relationship but the tensile ductility was increased by the hydrostatic stress. Small or little increase of fatigue life was observed by the superposition of the hydrostatic stress under a full reversed loading but a clear increase of fatigue life was found in a zero-to-tension loading. The hydrostatic stress significantly lowered the creep strain rate and elongated the creep rupture time. The hydrostatic stress also increased the creep-fatigue life under a full reversed loading.

The Behaviour of Creep-Fatigue Interactions in GH36 Superalloy

1985 ◽  
Author(s):  
Duan Zouxiang ◽  
Ning Youlian ◽  
He Jinrui
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Strain Energy ◽  
Low Cycle Fatigue ◽  
Energy Partitioning ◽  
Cycle Fatigue ◽  
Creep Fatigue

In this paper, the behaviour of creep-fatigue interactions in GH36 superalloy at 650°C is determined and a number of strainrange-life relationships of is given. Strain Energy Partitioning Approach (SEP), developed previously by the present authors, is applied to predict high-temperature, low-cycle fatigue life for this superalloy by comparison with Strainrange Partitioning method (SRP).

The Influence of Dwell Time on Low Cycle Fatigue Behavior of Ni-base Superalloy IC10

2017 ◽  
Vol 36 (8) ◽  
pp. 795-803
Author(s):  
Anqiang Wang ◽  
Lu Liu ◽  
Zhixun Wen ◽  
Zhenwei Li ◽  
Zhufeng Yue
Keyword(s):  
Fatigue Life ◽  
Dwell Time ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Dislocation Line ◽  
Reverse Direction ◽  
Structure Evolution ◽  
Cycle Fatigue ◽  
Creep Fatigue ◽  
Base Superalloy

AbstractLow cycle fatigue and creep-fatigue experiments of IC10 Ni-base superalloy plate specimens with multiple holes were performed below 1,000 °C. The average fatigue life is 105.4 cycles, while the creep-fatigue life is 103.4 cycles, which shows that the life of creep-fatigue is reduced 1–2 times compared with low cycle fatigue life. After tests, the detailed fracture and microscopic structure evolution were observed by scanning electron microscopy (SEM); meanwhile, the constitutive model based on crystal plasticity theory was established and the fracture mechanism was analyzed. Three conclusions have been obtained: First, the load during dwell time leads to the damage accumulation caused by deformation and the interaction of fatigue and creep shortens the service life of materials seriously. Second, in order to maintain the macroscopic deformation, a new slip plane starts to makes the dislocation slide in reverse direction, which leads to fatigue damage and initial cracks. Third, the inner free surface creates opportunities for escape of the dislocation line, which is caused by the cavity. What’s more, the cure dislocation generated by cyclic loading contributes to the formation and growth of cavities.

Fatigue Behavior of K447A Superalloy under Low Cycle Fatigue and Creep-Fatigue Interaction Conditions

2015 ◽  
Vol 750 ◽  
pp. 121-126 ◽  
Author(s):  
Hui Chen Yu ◽  
Cheng Li Dong ◽  
Ying Li
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Hold Time ◽  
Strain Ratio ◽  
Mean Stress ◽  
Cycle Fatigue ◽  
Creep Fatigue ◽  
Cyclic Damage ◽  
Mean Stresses

Strain-controlled low cycle fatigue (LCF) and creep-fatigue interaction (CFI) tests of K447A are conducted at 760oC in order to investigate the effects of different dwell times and strain ratios on the fatigue behavior and life. For the cases of stain ratio Rε=-1 with balanced hold time, the tensile and compressive mean stresses will generate. For the case of stain ratio Rε=-1 with compressive holding 60s, the tensile mean stress will produce. For the case of stain ratio Rε=-1 with tensile holding 60s, the compressive mean stress will produce. For the cases of stain ratio Rε=0.1 and Rε=-1with no hold time, the tensile mean stress will produce. The cyclic damage accumulation (CDA) method and modified CDA method were employed to predict the fatigue life for K447A, respectively. The fatigue life predicted by CDA method is within the scatter band of 18.2X. The fatigue life predicted by the modified CDA method agrees very well with the experimental life and the predicted life is well within the scatter band of 3.1X, which means that the modified CDA method is able to consider the influences of dwell time and strain ratio on the fatigue life of K447A.

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