Isochronous creep rupture loci on deviatoric plane and its application to P92 steel creep behaviour under multiaxial stress state

2017 ◽  
Vol 35 (6) ◽  
pp. 513-522 ◽  
Author(s):  
Xiang Lan ◽  
Hong Xu ◽  
Mengyang Li ◽  
Yongzhong Ni ◽  
Peng Guo
Keyword(s):  
Stress State ◽  
Creep Behaviour ◽  
Creep Rupture ◽  
Multiaxial Stress ◽  
P92 Steel ◽  
Multiaxial Stress State ◽  
Deviatoric Plane

The effect of multiaxial stress state on creep behavior and fracture mechanism of P92 steel

2015 ◽  
Vol 636 ◽  
pp. 70-76 ◽  
Author(s):  
Yuan Chang ◽  
Hong Xu ◽  
Yongzhong Ni ◽  
Xiang Lan ◽  
Hongyuan Li
Keyword(s):  
Stress State ◽  
Creep Behavior ◽  
Fracture Mechanism ◽  
Multiaxial Stress ◽  
P92 Steel ◽  
Multiaxial Stress State

scholarly journals The Effect of Multiaxial Stress State on Formation of Rafts in CMSX-4 Superalloy during Creep

2011 ◽  
Vol 278 ◽  
pp. 222-227 ◽  
Author(s):  
Marek Gebura ◽  
Juraj Lapin
Keyword(s):  
Stress State ◽  
Creep Behaviour ◽  
Surface Oxidation ◽  
Tensile Creep ◽  
Protective Atmosphere ◽  
Multiaxial Stress ◽  
Principal Stresses ◽  
Magnitude Distribution ◽  
Multiaxial Stress State ◽  
Material Creep

The effect of multiaxial stress state caused by a notch effect on microstructure degradation of single crystal nickel based superalloy CMSX-4 was studied during creep at a temperature of 950 °C, under constant nominal stress of 120 MPa for 500 and 1000 h. In order to minimize surface oxidation effects on microstructure degradation and notched geometry of specimens, all experiments were performed under protective atmosphere. The geometry of creep specimens was designed with the aim to obtain defined interval of principal stresses, which is sufficiently large to get reliable microstructure response during tensile creep experiments. Flat specimens with “U-type” notch were designed using elastic finite element method (FEM) calculations. Microstructure analysis of the crept specimens showed that notches affect degradation processes of the studied superalloy significantly. FEM elastic-plastic analysis was performed to simulate creep of the notched specimens. Material creep behaviour was integrated into calculations by a subroutine using equations derived from experimentally measured data for cylindrical creep specimens tested at various constant nominal stresses. Magnitude, distribution and orientation of principal stresses resulting from the specimen loading were calculated and their effect on formation of rafts was described.

Prediction of Creep Behaviour of 316LN SS Under Uniaxial and Multiaxial Stress State Using Kachanov–Rabotnov Model at 923 K

2020 ◽  
Vol 73 (6) ◽  
pp. 1645-1653
Author(s):  
C. Praveen ◽  
J. Christopher ◽  
V. Ganesan ◽  
G. V. Prasad Reddy ◽  
Shaju K. Albert
Keyword(s):  
Stress State ◽  
Creep Behaviour ◽  
Multiaxial Stress ◽  
Multiaxial Stress State ◽  
316Ln Ss

Study on Creep Behaviors of T92 Steel under Multiaxial Stress State

2013 ◽  
Vol 860-863 ◽  
pp. 774-779
Author(s):  
Xue Ping Mao ◽  
Yang Yu ◽  
Chao Li ◽  
Sai Dong Huang ◽  
Hong Xu ◽  
...  
Keyword(s):  
Stress State ◽  
Rupture Life ◽  
Creep Damage ◽  
Creep Rupture ◽  
Failure Behavior ◽  
Multiaxial Stress ◽  
Creep Tests ◽  
Creep Ductility ◽  
Notched Specimen ◽  
Multiaxial Stress State

Creep tests for smooth specimens and notched specimens of T92 steel were carried out to study the effect of multiaxial stress state on creep rupture behaviors at 650°C. Creep rupture life was estimated by representative stress at multiaxial state of stress, the failure behavior of multiaxial creep was analyzed, and Kachanov creep damage formula was used to analyze the experimental data. The results show that the notch strengthens rupture life, multiaxial rupture behavior is controlled by mixed parameters, the creep ductility of the smooth and notched specimen decreases with rupture time, and damage factors of the smooth specimen and notched specimen are similar according to Kachanov formula.

Analysis on Fracture Morphology and Microstructure of T92 Steel after High Temperature Multiaxial Creep

2013 ◽  
Vol 860-863 ◽  
pp. 967-971
Author(s):  
Xue Ping Mao ◽  
Xiao Wang ◽  
Sai Dong Huang ◽  
Chao Li ◽  
Hong Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Stress State ◽  
Standard Specimen ◽  
Uniaxial Stress ◽  
Fracture Morphology ◽  
Multiaxial Stress ◽  
Creep Life ◽  
Creep Tests ◽  
Multiaxial Stress State ◽  
Multiaxial Creep

The high temperature creep tests of standard specimen and double U-type notch specimen of T92 steel were carried out under different stresses at 650 °C. Then optical microscopy and scanning electron microscopy were used to observe the fracture morphology and microstructure. The results show that the multiaxial stress state leads to the creep fracture cracking initiation in notch. Under multiaxial stress state, the failure mode of T92 steel is transgranular and dimple plastic fracture, and is more obvious with the increase of creep life. Compared with under uniaxial stress state, the precipitates under multiaxial stress state are larger in size and quantity, and are much coarser.

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