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fatigue crack propagation

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Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 570-579, October 21–24, 2019,
... Abstract Single crystal Ni-base superalloys are subjected to tension hold at high temperature in addition to cyclic loading during the operation of gas turbines. Various studies have investigated creep-fatigue crack propagation in superalloys under trapezoidal loadings and evaluated the life...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 535-545, October 21–24, 2019,
... Abstract In this study, fatigue crack propagation behavior at lower temperature in single crystal nickel-base superalloys was investigated experimentally and analytically. Four types of compact specimens with different combinations of crystal orientations in loading and crack propagation...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 610-621, October 11–14, 2016,
... Abstract The fatigue crack propagation thresholds of SAW weld metal of 25Cr2Ni2MoV simulating product of fossil and nuclear power low pressure turbine rotor at different stress ratios are tested. There is a big dispersity of the test results, even at the same stress ratio. The double logarithm...
Proceedings Papers

AM-EPRI2004, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Fourth International Conference, 930-949, October 25–28, 2004,
... Abstract This paper reports on a study that investigated how low cycle fatigue (LCF) and fatigue crack propagation (FCG) properties of P92, P122, and P23 steels vary between 600°C and 700°C depending on the location relative to a cross weld. Microstructure analysis was also performed...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1-10, October 21–24, 2019,
... of conventional and novel steels were investigated in thermo-mechanical fatigue and fatigue crack propagation experiments. Based on the results, improved, ferritic “HiperFer” (High performance Ferrite) steels were designed, produced and characterized. A brief description of the current state of development...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 483-494, October 15–18, 2024,
... of physically short cracks. This allows the evaluation of the behavior of both near-surface and internal defects that are not accessible to the atmosphere. crack propagation fatigue crack growth finite element simulation gas turbine blades high cycle fatigue laser powder bed fusion nickel-based...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 517-527, October 15–18, 2024,
... them potentially transformative for future energy technologies. This paper examines the microstructural mechanisms underlying HiperFer’s enhanced fatigue resistance in both short and long crack propagation, while also presenting current findings on salt corrosion properties and exploring potential...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 90-100, October 11–14, 2016,
...-10CrMoV steels already applied in different types of turbines successfully. Heavy cyclic loading getting more importance than in the past results in utilization of the fatigue capabilities at high and low temperatures which might lead to crack initiation and subsequent crack propagation. Fracture...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 429-440, October 15–18, 2024,
... was unknown. As shown in Figure 8b) fatigue crack propagation was near the upper scatter band from tests done in the German HTR program. At 620 °C and lower, better crack propagation behavior could be observed. From this, it can be concluded that the material is of higher strength. The crack propagation rates...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 351-359, October 22–25, 2013,
... Abstract This paper presents the creep and creep-fatigue crack growth behaviors of 30Cr1Mo1V turbine rotor steel which had been in service for 16 years. Two typical sections of the rotor, i.e. high and low temperature sections, are examined at 538°C, with crack initiation and propagation...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 488-495, October 21–24, 2019,
... are known to have susceptibility to brittle cracking under hold-time fatigue in air. Literatures regarding fatigue crack growth suggest that oxygen diffusion at grain boundary during hold-time or under low frequency assists crack propagation and consequently cracks behave as time-dependent [1]. In air...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 180-189, October 22–25, 2013,
.... This article shows results of currently investigated nickel-based alloys for newly developed headers, pipes and other high temperature boiler applications and their critical creep crack propagation behavior. A-USC power plants creep crack growth headers high temperature boilers nickel-based alloys...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 260-270, October 11–14, 2016,
... transgranular at the edges of the holes on the inner surface, propagate also mainly transgranular into the base material (Fig. 6 and 7). The multiple cracks found are characteristic for (thermal)-fatigue damage. The intergranular contribution to crack growth was very low in both material regions. In the area...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 254-264, October 22–25, 2013,
... hold time upto 500 seconds were introduced at 750°C by applying trapezoidal waveform. Fracture surfaces were examined by optical and scanning electron microscope to determine the fatigue crack initiation and propagation modes. Studies were also conducted on longitudinal section of the specimen...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 747-758, October 11–14, 2016,
... was a groove from the machining. The other initial part was a corrosion fatigue mechanism with corrosion pittings detected in surface around the main crack. The corrosion fatigue starts at several point with corrosion pitting which initiated cracks in the tip of the pitting. The small cracks propagated...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1351-1360, October 21–24, 2019,
... of the Charpy specimens of the present 10% Cr steel and P92-type steel fractured at nearly the same temperatures of 10 and 20 C, respectively, in the stable crack propagation region are shown in Fig. 7. The distinct difference in the microvoid formation in these steels is clearly seen in Fig. 7. The voids...
Proceedings Papers

AM-EPRI2004, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Fourth International Conference, 653-671, October 25–28, 2004,
... creep processes affect pre-existing defects is essential for ensuring long-term component integrity. crack propagation creep crack initiation creep-fatigue interaction life assessment martensitic stainless steel thermal efficiency ultra super critical power plants httpsdoi.org/10.31399...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 405-415, October 21–24, 2019,
... (J-R) with multiple-sample method by using a mechanical testing machine (MTS Landmark 1). Figure 1 shows the sampling location and dimensions of compact tension sample manufactured according to the international standard ISO 12135 [18]. The samples were fatigue pre-cracked at room temperature...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 750-761, October 21–24, 2019,
... and vacuum at different frequencies [23]. Their work showed that, depending on the test conditions, fatigue failure in A286 can occur in intergranular or transgranular or even mixed mode fashion. Wu et al. reported that under high stress cycles, cracks monotonously propagate to failure in A286 [24]. However...
Proceedings Papers

AM-EPRI2010, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Sixth International Conference, 450-469, August 31–September 3, 2010,
... conditions, the time required for a fatigue crack to initiate and to propagate to fracture was determined. Specimens were load-cycled within the test chamber at an ultrasonic (19KHz) frequency. This allowed the minimum cyclic load for the given conditions to be determined. The specimens were observed...