This paper is concerned with the development of a methodology for thermomechanical analysis of high temperature, steam-pressurized P91 pipes in electrical power generation plant under realistic (measured) temperature and pressure cycles. In particular, these data encompass key thermal events, such as “load-following” temperature variations and sudden, significant fluctuations in steam temperatures associated with attemperation events and “trips” (sudden plant shut-down), likely to induce thermomechanical fatigue damage. An anisothermal elastic-plastic-creep material model for cyclic behavior of P91 is employed in the transient finite element (FE) model to predict the stress–strain-temperature cycles and the associated strain-rates. The results permit characterization of the behavior of pressurized P91 pipes for identification of the thermomechanical loading histories relevant to such components, for realistic, customized testing. This type of capability is relevant to design and analysis with respect to the evolving nature of power plant operating cycles, e.g., associated with more flexible operation of fossil fuel plant.

References

1.
Viswanathan
,
V.
,
Purgert
,
R.
,
Henry
,
J.F.
,
Tanzosh
,
J.
,
Stanko
,
J.
,
Shingledecker
,
J.
, and
Vitalis
,
B.
,
2005
, “
U.S. Program on Materials Technology for Ultra-Supercritical Coal Power Plants
,”
J. Mater. Eng. Perform.
,
14
(
3
), pp.
281
292
.10.1361/10599490524039
2.
Fournier
B.
,
Sauzay
M.
,
Caës
C.
,
Noblecout
M.
,
Mottot
M.
,
Bougault
A.
,
Rabeau
V.
,
Pineau
A.
,
2008
, “
Creep-Fatigue-Oxidation Interactions in a 9Cr-1Mo Martensitic Steel. Part I: Effect of Tensile Holding Period on Fatigue Lifetime
,”
Int. J. Fatigue
,
30
, pp.
649
662
.10.1016/j.ijfatigue.2007.05.007
3.
Saad
A. A.
,
Hyde
C. J.
,
Sun
W.
,
Hyde
T. H.
,
2010
, “
Thermal-Mechanical Fatigue Simulation of a P91 Steel in a Temperature Range of 400–600 °C
,”
ASME PVP Conference
.
4.
Lee
,
J.-H.
, and
Koo
,
G.-H.
,
2007
, “
Investigation of Ratcheting Characteristics of Modified 9Cr-1Mo Steel by Using the Chaboche Constitutive Model
,”
Int. J. Pressure Vessels Piping
,
84
, pp.
284
292
.10.1016/j.ijpvp.2006.12.002
5.
Deshpande
,
A.
,
Leen
,
S. B.
, and
Hyde
,
T. H.
,
2010
, “
Experimental and Numerical Characterisation of the Cyclic Thermomechanical Behaviour of a High Temperature Forming Tool Alloy
,”
ASME J. Manuf. Sci. Eng.
,
132
(
5
) p.
051013
. 10.1115/1.4002534
6.
Penny
,
R. K.
, and
Marriott
,
D. L.
,
1995
,
Design for Creep
, 2nd edition,
Chapman and Hall
,
London, UK
, Vol.
1
.
7.
Okrajni
,
J.
,
Junak
,
G.
, and
Marek
,
A.
,
2008
, “
Modelling of the Deformation Process Under Thermo-Mechanical Fatigue Conditions
,”
Int. J. Fatigue
,
30
, pp.
324
329
.10.1016/j.ijfatigue.2007.01.043
8.
Aktaa
J.
,
Klotz
,
M.
, and
Petersen
,
C.
,
2007
, “
Deformation and Damage of RAFM Steels Under Thermo-Mechanical Loading: A Challenge for Constitutive Equations
,”
J. Nucl. Mater.
, pp.
367
370
.
9.
ESB Energy International.
,
2011
, personal communication.
10.
ASME
,
1995
, ASME B31.1 Code for Pressure Piping,
ASME
,
NY
.
11.
Holman
,
J. P.
,
2002
,
Heat Transfer
, 9th ed.,
McGraw-Hill
,
New York
.
12.
Steam Engineering Principles and Heat Transfer
,”
2011
, www.spiraxsarco.com
13.
Fournier
,
B.
,
Sauzay
,
M.
,
Caës
,
C.
,
Noblecout
,
M.
, and
Mottot
,
M.
,
2006
, “
Analysis of the Hysteresis Loops of a Martensitic Steel Part I: Study of the Influence of Strain Amplitude and Temperature Under Pure Fatigue Loadings Using an Enhanced Stress Partitioning Method
,”
J. Mater. Sci. Eng.
, pp.
183
196
.10.1016/j.msea.2006.08.086
14.
Okrajni
,
J.
,
Junak
,
G.
, and
Marek
,
A.
,
2007
, “
Description of the Deformation Process Under Thermo-Mechanical Fatigue
,”
Int. J. Fatigue
,
2
, pp.
15
24
.
15.
Kichenin
,
J.
, and
Dang Van
,
K.
,
1996
, “
Finite-Element Simulation of a New Two-Dissipative Mechanisms Model for Bulk Medium-Density Polyehylene
,”
J. Mater. Sci.
,
31
, pp.
1653
1661
.10.1007/BF00357878
16.
Lemaitre
,
J.
, and
Chaboche
,
J.
,
1990
,
Mechanics of Solid Materials
,
Cambridge University Press
,
UK
.
17.
Koo
,
G. H.
, and
Kwon
,
J. H.
,
2011
, “
Identification of Inelastic Material Parameters for Modified 9Cr-1Mo Steel Applicable to the Plastic and Viscoplastic Constitutive Equations
,”
Int. J. Pressure Vessels Piping
,
88
, pp.
26
33
.10.1016/j.ijpvp.2010.11.004
You do not currently have access to this content.