Thermal-mechanical fatigue behavior of a cast K417 nickel-based superalloy

Liu, F.; Ai, S. H.; Wang, Y. C.; Zhang, H.; Wang, Z. G.

doi:10.1016/s0142-1123(02)00010-5

Cited by 36 publications

(17 citation statements)

References 9 publications

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“…After this, the thermal strain, εth is subtracted from total strain, εtot to obtain the mechanical strain, εmech according to Eqn (3). The test is controlled on mechanical strain through subtracting thermal strain from total strain according to Eqn (3) [14,22,29,30]. …”

Section: Figure 8 Typical Stable Hysteresis Loops With Dwell Time Dumentioning

confidence: 99%

“…Both IP and OP testing have lower fatigue life compared to isothermal LCF and regarding IP and OP so have IP-testing lower fatigue life than OP-testing, However, there is a crossover when the strain is below 0.4% the OP-testing obtain longer fatigue life than IPtesting. In the studies, where dwell time is used in the IP-testing the fatigue life drastically decrease due to stress relaxation occur and increasing the contribution of creep damage in the testing [14,22,24,26,27,29,31,32].…”

Section: Materials Response During Fatigue Testingmentioning

confidence: 99%

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Influence of deformation and environmental degradation of Inconel 792

Kanesund¹

2017

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Industrial gas turbines are often used as a mechanical drive for pumps and compressors or in power generation as an electric power supply. The gas turbine has for many years been a popular engine due to its flexibility with respect to different types of fuel and due to a design, that enables a high power-to-weight ratio. A simplified description of a gas turbine is that the engine consists of a cold and hot section. The turbo compressor section belongs to cold section and the combustion chamber together with the turbine section belongs to the hot section. In the hot section of a gas turbine, the condition is extremely severe because of an aggressive environment characterized by high temperatures, increased temperature gradients, high pressure and centrifugal forces resulting in large stresses on individual components together with an oxidizing and corroding atmosphere. Materials used in the high temperature section (hot gas path) of a modern gas turbine are different types of superalloys, as single crystal, directionally solidified or polycrystalline alloys, depending on temperature and load conditions. In the first turbine stage, temperature is very high due to exposure to the combustion gas. To handle the problem with creep, single crystal superalloys are often used in this section. In the second row of turbine blades, the temperature of the gas is lower and polycrystalline superalloys are typically used. IN-792 is a cast polycrystalline superalloy with high strength, good resistance to hot corrosion and a cheaper option than single crystals. In the hot section of gas turbine, IN-792 is a suitable material for components such as turbine blades and vans where a complex load condition, high temperature and severe environment prevails. Due to startup and shutdown of the gas turbine engine during service, the components in the hot section are exposed to cyclic load and temperature. This will generate mechanical and thermal fatigue damage in gas turbine components. Steady state temperature gradient arises by the cooling system acting at cold spots during service to introduce tensile stress, which indirectly gives rise to creep damage in the component. This work includes tree studies of deformation and damage mechanisms of superalloy IN-792. The first study is made on test bars exposed to thermomechanical fatigue in laboratory environment, the second and the third study is made on turbine blades used during service. In the second study, the machines are placed off-shore and exposed to marine environment. In the third study the machine is landbased and exposed to an industrial environment. In the second study, the deformation and damage mechanisms are compared between the turbine blades used during service and the test bars exposed to thermomechanical fatigue testing in the first study.v

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Section: Figure 8 Typical Stable Hysteresis Loops With Dwell Time Dumentioning

confidence: 99%

Section: Materials Response During Fatigue Testingmentioning

confidence: 99%

Influence of deformation and environmental degradation of Inconel 792

Kanesund¹

2017

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“…Thermo-mechanical Fatigue (TMF) of single crystal (SC) turbine blade materials is becoming a critical issue, because of the ever increasing inlet gas temperature and the stronger internal cooling, causing a higher thermal stress in the airfoil material [1][2][3]. Moreover, when used in land-base gas turbines in weekly or daily start and stop (WSS or DSS) mode -the latter is most typical in Japanese gas-turbine power stations -the turbine airfoil materials suffer from a larger number of TMF cycles.…”

Section: Introductionmentioning

confidence: 99%

Assessment on the Thermo-Mechanical Fatigue Properties of 98 Ni-Base Single Crystal Superalloys

Sakamoto¹,

Harada²,

Yokokawa³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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Thermo-mechanical fatigue (TMF) property data generated in NIMS on 1st to 5th generation single crystal (SC) superalloys have been analyzed to understand the compositional and structural factors affecting the property. It was found that Re and Ru additions effectively improve the out-of-phase TMF property.The optimum γ' fraction was found to be about 74%. A prediction equation for the TMF life from a given chemical composition has been derived for designing further superior SC superalloys.

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“…Extended work has been carried out on the mechanical behavior and microstructure of Ni-based SC superalloys in the past decades. [1][2][3][4][5][6][7][8][9][10][11][12] However, these investigations concern mainly the creep and isothermal low-cycle fatigue (LCF). [1][2][3][4][5][6][7][8] The TMF behavior of Nibased SC superalloys, despite its great importance from the viewpoint of applications, has not been reported as much to date.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] The TMF behavior of Nibased SC superalloys, despite its great importance from the viewpoint of applications, has not been reported as much to date. [9][10][11][12] The TMS-75 superalloy has been developed at the National Institute for Materials Science as a third-generation SC superalloy. [13] Mechanical tests and other experiments, such as ␥/␥' lattice-misfit determination, creep, LCF, and oxidationresistance tests, have been performed for the evaluation of this superalloy.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical fatigue behavior of the third-generation, single-crystal superalloy TMS-75: Deformation structure

Zhou

Koizumi

et al. 2004

Metall Mater Trans A

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The deformation structure after the out-of-phase thermomechanical fatigue (OP TMF) of the single-crystal (SC), Ni-based superalloy TMS-75 has been studied. Mechanical experiments were performed at temperatures between 400 °C and 900 °C under different total strain ranges with varying hold times in the compression stage. The lives of TMF for samples with hold times of 10 and 60 minutes dropped drastically by one order of magnitude as compared with those without it. Different structures developed during TMF were correlated to the difference in mechanical behavior for the two cases. The dislocations in the ␥ phase and the stacking faults (SFs) in the ␥' phase were quantitatively analyzed by transmission electron microscopy (TEM). This work verified that shearing of the ␥' precipitates occurred with a single-dislocation mechanism rather than a dislocation-reaction mechanism. The implications of this work on the design of superalloys are presented.

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Thermal-mechanical fatigue behavior of a cast K417 nickel-based superalloy

Cited by 36 publications

References 9 publications

Influence of deformation and environmental degradation of Inconel 792

Influence of deformation and environmental degradation of Inconel 792

Assessment on the Thermo-Mechanical Fatigue Properties of 98 Ni-Base Single Crystal Superalloys

Thermomechanical fatigue behavior of the third-generation, single-crystal superalloy TMS-75: Deformation structure

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