Investigating creep rupture and damage behaviour in notched P92 steel specimen using a microscale modelling approach

2017 ◽  
Vol 41 (2) ◽  
pp. 456-472 ◽  
Author(s):  
L. Zhao ◽  
N. Alang ◽  
K. Nikbin
Keyword(s):  
Steel Specimen ◽  
Creep Rupture ◽  
P92 Steel ◽  
Microscale Modelling ◽  
Modelling Approach

scholarly journals Estimating the Influences of Prior Residual Stress on the Creep Rupture Mechanism for P92 Steel

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 639 ◽  
Author(s):  
Dezheng Liu ◽  
Yan Li ◽  
Xiangdong Xie ◽  
Guijie Liang ◽  
Jing Zhao
Keyword(s):  
Residual Stress ◽  
Flow Stress ◽  
Power Plants ◽  
Creep Damage ◽  
Creep Rupture ◽  
Transgranular Fracture ◽  
Creep Tests ◽  
Energy Principle ◽  
P92 Steel ◽  
Rupture Mechanism

Creep damage is one of the main failure mechanisms of high Cr heat-resistant steel in power plants. Due to the complex changes of stress, strain, and damage at the tip of a creep crack with time, it is difficult to accurately evaluate the effects of residual stress on the creep rupture mechanism. In this study, two levels of residual stress were introduced in P92 high Cr alloy specimens using the local out-of-plane compression approach. The specimens were then subjected to thermal exposure at the temperature of 650 °C for accelerated creep tests. The chemical composition of P92 specimens was obtained using an FLS980-stm Edinburgh fluorescence spectrometer. Then, the constitutive coupling relation between the temperature and material intrinsic flow stress was established based on the Gibbs free energy principle. The effects of prior residual stress on the creep rupture mechanism were investigated by the finite element method (FEM) and experimental method. A comparison of the experimental and simulated results demonstrates that the effect of prior residual stress on the propagation of micro-cracks and the creep rupture time is significant. In sum, the transgranular fracture and the intergranular fracture can be observed in micrographs when the value of prior residual stress exceeds and is less than the material intrinsic flow stress, respectively.

Creep Fracture Analysis of W Strengthened 9% Cr Steel Weldment

2010 ◽  
Vol 154-155 ◽  
pp. 1699-1704
Author(s):  
Xue Wang ◽  
Qian Gang Pan ◽  
Zi Jun Liu ◽  
Hui Qiang Zeng ◽  
Yong Shun Tao
Keyword(s):  
Arc Welding ◽  
Rupture Strength ◽  
Fracture Analysis ◽  
Creep Rupture ◽  
Creep Rupture Strength ◽  
Creep Tests ◽  
P92 Steel ◽  
Fine Grained ◽  
Weld Joints ◽  
M23c6 Carbides

The creep rupture behaviour,hardness distribution and microstructure of weldment made by submerge arc welding for W strengthened P92 steel are described in this paper. The cross-weld creep tests were carried out at 923K under stresses in the ranges 130-100MPa. For stress below 120MPa, weld-joints were ruptured by the Type crack, which located in their fine-grained heat affected zone(FGHAZ)with the smallest measured cross-weld hardness. A strong drop in creep rupture strength of weldment was induced by brittle type failure. In addition to coarsening of M23C6 carbides and an equiaxed fine grains in FGHAZ, intermetallic Fe2(Mo,W)Laves phase precipitated on grain boundaries during creep is probably the significant factor caused the type failure.

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

Effect of Laves phase on the creep rupture properties of P92 steel

2016 ◽  
Vol 668 ◽  
pp. 215-223 ◽  
Author(s):  
Lakshmiprasad Maddi ◽  
G.S. Deshmukh ◽  
A.R. Ballal ◽  
D.R. Peshwe ◽  
R.K. Paretkar ◽  
...  
Keyword(s):  
Creep Rupture ◽  
Laves Phase ◽  
P92 Steel ◽  
Rupture Properties

scholarly journals Influence of normalizing and tempering temperatures on the creep properties of P92 steel

2020 ◽  
Vol 39 (1) ◽  
pp. 178-188
Author(s):  
Lakshmiprasad Maddi ◽  
Atul Ramesh Ballal ◽  
Dilip Ramkrishna Peshwe ◽  
M. D. Mathew
Keyword(s):  
Power Plants ◽  
Rupture Strength ◽  
Rupture Life ◽  
Creep Rupture ◽  
Laves Phases ◽  
P92 Steel ◽  
Creep Properties ◽  
Martensitic Microstructure ◽  
Actual Service ◽  
Rupture Properties

AbstractP92 steel is used as a piping material in ultra super critical power plants that can be operated at steam temperatures up to 650°C. The changes in the martensitic microstructure of P92 steel must be evaluated thoroughly before it is put into actual service. In this study, indigenously developed P92 steel was used. The steel was subjected to normalizing and tempering heat treatments in the range of 1,040–1,060°C and 740–780°C. The changes in the microstructure were evaluated and creep-rupture properties were studied at test temperatures of 600 and 650°C. Although normalizing temperatures influenced the microstructure and creep strength marginally, the change in tempering temperatures led to significant changes. The creep rupture strength at 600°C was influenced largely by the changes in the dislocation substructure, while the precipitation of Laves phases was a significant observation made for 650°C test temperature. Proposed mechanisms for the microstructural evolution and its consequences on the rupture life are discussed in this study.

scholarly journals X-ray micro-tomography based FEM modelling of hygroexpansion in PLA composites reinforced with birch pulp fibers

2017 ◽  
Vol 50 (3) ◽  
pp. 131-136
Author(s):  
Stefania Fortino ◽  
Merja Sippola ◽  
Tom Andersson ◽  
Kirsi Immonen ◽  
Arttu Miettinen ◽  
...  
Keyword(s):  
Material Properties ◽  
Elastic Moduli ◽  
Pulp Fibers ◽  
X Ray ◽  
X Ray Computed ◽  
Micro Tomography ◽  
Microscale Modelling ◽  
Different Levels ◽  
Good Agreement ◽  
Modelling Approach

This article presents a microscale modelling approach coupled with X-ray computed micro-tomography for the evaluation of material properties of polylactic acid (PLA) reinforced by birch pulp fibers under the effect of moisture. The results in terms of elastic moduli and hygroexpansion deformation were found in good agreement with the measurements taken at different levels of water uptake.

TYPE IV CREEP RUPTURE CHARACTERISTICS OF P92 STEEL WELDMENT

2013 ◽  
Vol 48 (4) ◽  
pp. 427-434
Author(s):  
Xue WANG ◽  
Qiangang PAN ◽  
Yongshun TAO ◽  
Yinglin ZHANG ◽  
Huiqiang ZENG ◽  
...  
Keyword(s):  
Creep Rupture ◽  
P92 Steel ◽  
Steel Weldment ◽  
Type Iv

Creep rupture behaviour of P92 steel weldment

2011 ◽  
Vol 18 (1) ◽  
pp. 186-191 ◽  
Author(s):  
Wang Xue ◽  
Pan Qian-gang ◽  
Liu Zhi-jun ◽  
Zeng Hui-qiang ◽  
Tao Yong-shun
Keyword(s):  
Creep Rupture ◽  
P92 Steel ◽  
Steel Weldment

scholarly journals Stomatal transpiration and droplet evaporation on leaf surfaces by a microscale modelling approach

2013 ◽  
Vol 65 ◽  
pp. 180-191 ◽  
Author(s):  
Thijs Defraeye ◽  
Pieter Verboven ◽  
Dominique Derome ◽  
Jan Carmeliet ◽  
Bart Nicolai
Keyword(s):  
Droplet Evaporation ◽  
Leaf Surfaces ◽  
Microscale Modelling ◽  
Modelling Approach
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