The predictive capability of the Sehitoglu–Boismier unified constitutive and life model for Mar-M247 Ni-base superalloy is extended from a maximum temperature of 871 °C to 1038 °C. The unified constitutive model suitable for thermomechanical loading is adapted and calibrated using the response from isothermal cyclic experiments conducted at temperatures from 500 °C to 1038 °C at different strain rates with and without dwells. The flow rule function and parameters as well as the temperature dependence of the evolution equation for kinematic hardening are established. Creep and stress relaxation are critical to capture in this elevated temperature regime. The coarse-grained polycrystalline microstructure exhibits a high variability in the predicted cyclic response due to the variation in the elastic response associated with the orientation of the crystallographic grains. The life model accounts for fatigue, creep, and environmental damage under both isothermal and thermomechanical fatigue (TMF).

References

References
1.
Boismier
,
D. A.
, and
Sehitoglu
,
H.
,
1990
, “
Thermo-Mechanical Fatigue of Mar-M247: Part 1—Experiments
,”
ASME J. Eng. Mater. Technol.
,
112
(
1
), pp.
68
79
.10.1115/1.2903189
2.
Neu
,
R. W.
, and
Sehitoglu
,
H.
,
1989
, “
Thermo-Mechanical Fatigue, Oxidation and Creep Part I: A Study of Damage Mechanisms
,”
Metall. Trans. A
,
20
(
9
), pp.
1755
1767
.10.1007/BF02663207
3.
Neu
,
R. W.
, and
Sehitoglu
,
H.
,
1989
, “
Thermo-Mechanical Fatigue, Oxidation and Creep Part II: A Life Prediction Model
,”
Metall. Trans. A
,
20
(
9
), pp.
1769
1783
.10.1007/BF02663208
4.
Sehitoglu
,
H.
, and
Boismier
,
D. A.
,
1990
, “
Thermo-Mechanical Fatigue of Mar-M247: Part 2—Life Prediction
,”
ASME J. Eng. Mater. Technol.
,
112
(
1
), pp.
80
89
.10.1115/1.2903191
5.
Slavik
,
D.
, and
Sehitoglu
,
H.
,
1987
, “
A Constitutive Model for High Temperature Loading Part I—Experimentally Based Forms of the Equations
,”
Thermal Stress, Material Deformation, and Thermo-Mechanical Fatigue
,
American Society of Mechanical Engineers
,
New York
, pp.
65
73
.
6.
Slavik
,
D.
, and
Sehitoglu
,
H.
,
1987
, “
A Constitutive Model for High Temperature Loading Part II—Comparison of Simulations With Experiments
,”
Thermal Stress, Material Deformation, and Thermo-Mechanical Fatigue
,
American Society of Mechanical Engineers
,
New York
, pp.
75
82
.
7.
Fernandez-Zelaia
,
P.
,
2012
, “
Thermomechanical Fatigue Crack Formation in Nickel-Base Superalloys at Notches
,” Master's thesis, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA.
8.
Slavik
,
D.
, and
Cook
,
T. S.
,
1990
, “
A Unified Constitutive Model for Superalloys
,”
Int. J. Plast.
,
6
(
6
), pp.
651
664
.10.1016/0749-6419(90)90037-F
9.
Kuhn
,
H. A.
, and
Sockel
,
H. G.
,
1988
, “
Comparison Between Experimental Determination and Calculation of Elastic Properties of Nickel-Base Superalloys Between 25 and 1200 °C
,”
Phys. Status Solidi A
,
110
(
2
), pp.
449
458
.10.1002/pssa.2211100217
10.
Simulia Corp.
,
2011
, Abaqus v. 6.11-1, Dassault Systèmes, Providence, RI.
11.
McGinty
,
R. D.
,
2001
, “
Multiscale Representation of Polycrystalline Inelasticity
,” Ph.D. thesis, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA.
You do not currently have access to this content.