Damage behaviour in different micro-regions of P92 steel weldment under sequential low cycle fatigue and creep loading

2021 ◽  
pp. 107935
Author(s):  
Wei Zhang ◽  
Xiaowei Wang ◽  
Zitong Kang ◽  
Tianyu Zhang ◽  
Yong Jiang ◽  
...  
Keyword(s):  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
P92 Steel ◽  
Steel Weldment ◽  
Creep Loading

Low Cycle Fatigue Behavior of Original Ferritic P92 Steel at High Temperature: Experiments and Simulations

2015 ◽  
Author(s):  
Xiaowei Wang ◽  
Jianming Gong ◽  
Yong Jiang ◽  
Yanping Zhao
Keyword(s):  
Plastic Material ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Constant Strain Rate ◽  
Cyclic Softening ◽  
Isotropic Hardening ◽  
Cycle Fatigue ◽  
Stress Strain ◽  
P92 Steel ◽  
Softening Behavior

Low cycle fatigue tests of original ferritic P92 steel at high temperatures and different strain amplitudes were conducted to investigate its cyclic softening behavior and fracture behavior. LCF tests of strain amplitudes ranging from ±0.2% to ±0.8% were performed in fully reversed manner with constant strain rate at 600 °C and 650 °C. In order to represent the different hysteresis stress-strain curves and the cyclic softening behavior of P92 steel, a cyclic plastic material model was used. In the model, improved nonlinear isotropic hardening parameter was proposed to make better simulation of the cyclic softening behavior. Based on the simulated stress-strain hysteresis loops, an energy-based life prediction model was used to predict the low cycle fatigue life. When compared with experimental responses, the simulations and predicted life were found to be quite reasonable. Low cycle fatigue fractography of the P92 steel was also observed, and it was found to be associated with the different strain amplitudes imposed on the specimen, the larger strain amplitude the more amounts of crack initiation sites could be found.

scholarly journals Low Cycle Fatigue and Relaxation Performance of Ferritic–Martensitic Grade P92 Steel

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 99 ◽  
Author(s):  
Maria Jürgens ◽  
Jürgen Olbricht ◽  
Bernard Fedelich ◽  
Birgit Skrotzki
Keyword(s):  
Power Plants ◽  
Low Cycle Fatigue ◽  
Hold Time ◽  
Construction Materials ◽  
Combined Loading ◽  
Cycle Fatigue ◽  
Martensitic Steels ◽  
Total Strain Range ◽  
P92 Steel ◽  
Good Oxidation Resistance

Due to their excellent creep resistance and good oxidation resistance, 9–12% Cr ferritic–martensitic stainless steels are widely used as high temperature construction materials in power plants. However, the mutual combination of different loadings (e.g., creep and fatigue), due to a “flexible” operation of power plants, may seriously reduce the lifetimes of the respective components. In the present study, low cycle fatigue (LCF) and relaxation fatigue (RF) tests performed on grade P92 helped to understand the behavior of ferritic–martensitic steels under a combined loading. The softening and lifetime behavior strongly depend on the temperature and total strain range. Especially at small strain amplitudes, the lifetime is seriously reduced when adding a hold time which indicates the importance of considering technically relevant small strains.

scholarly journals The Influence Of Load History On Durability Of P92 Steel Used For The Construction Of Energy Pipelines

2015 ◽  
Vol 60 (3) ◽  
pp. 1853-1858 ◽  
Author(s):  
M. Cieśla ◽  
G. Junak
Keyword(s):  
Plastic Deformation ◽  
Mechanical Characteristics ◽  
Low Cycle Fatigue ◽  
Research Problem ◽  
Cycle Fatigue ◽  
Load History ◽  
Heavy Load ◽  
P92 Steel ◽  
Research Material ◽  
Reverse Situation

Abstract The research material used in the study was the martensitic creep-resistant steel P92 used for the manufacture of pipes being part of power generation units subject to heavy load. The research problem focused on two issues. The first one was to analyze how the plastic deformation cumulated in the material in low-cycle fatigue conditions affects the characteristics of the material in creep conditions in a temperature of 600ºC. The other one was concerned with analysis of a reverse situation, i.e. how the initial plastic deformation of the material in creep conditions changes the mechanical characteristics of the steel under low-cycle fatigue conditions in a temperature of 600ºC.

Characterization of Low Cycle Fatigue of Ferritic-Martensitic P92 Steel: Effect of Temperature

2015 ◽  
Vol 87 (6) ◽  
pp. 761-771 ◽  
Author(s):  
Xiaowei Wang ◽  
Yong Jiang ◽  
Jianming Gong ◽  
Yanping Zhao ◽  
Xin Huang
Keyword(s):  
Low Cycle Fatigue ◽  
Effect Of Temperature ◽  
Cycle Fatigue ◽  
P92 Steel
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