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intrinsic defects

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Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 1417-1421, October 22–25, 2013,
... analysis revealed the formation of Fe-rich nodules with an internal Cr-carbide layer beneath them. Notably, the number of nodules decreased with increasing oxygen content but remained independent of the oxidation time. To explain these observations, the authors propose that “intrinsicdefects within...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 1149-1160, October 15–18, 2024,
... at 400 °C, Frank loops were the predominant form of lattice damage at 1 dpa, whereas small defect clusters were more prevalent at 6 dpa. For the sample irradiated to 1 dpa at 600 °C, both Frank loops and small defect clusters were present in similar density. Nanoindentation was employed to assess...
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,
... Abstract For the safe life prediction of components under high cycle fatigue loading at high temperature, such as gas turbine blades and turbocharger components, the behavior of initial defects, which are physically short cracks below the long crack threshold ΔK is of crucial importance...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 441-448, October 15–18, 2024,
... before and after the creep tests suggested that the γ" precipitates were distinguishably finer in alloy Ta-718 than in alloy 718 throughout the creep tests. The formation of planar defects and shearing of γ" precipitates occurred frequently in the alloy 718 specimen. The observed creep deformations were...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 924-932, October 15–18, 2024,
... Abstract Solidification cracking (SC) is a defect that occurs in the weld metal at the end of the solidification. It is associated with the presence of mechanical and thermal stresses, besides a susceptible chemical composition. Materials with a high solidification temperature range (STR...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 90-100, October 11–14, 2016,
... mechanics methods and evaluation concepts have demonstrated their applicability to assess the integrity of components with defects or crack-like outage findings. Based on realistic modelling of the failure mechanism, accurate prediction of crack sizes at failure state can be improved defining...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 23-38, October 15–18, 2024,
... was mainly related to the intrinsic properties of the grain boundaries with negligible segregation due to the use of feedstock powder with lower impurity content and the solidification rates of the process. Optimization of the LMD process was performed to obtain repaired 316L SS samples meeting the following...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 1331-1337, October 15–18, 2024,
... by interactions between fluorides and graphite has also been reported by previous studies. Yang et al. observed the formation of C F bonds in graphite after an infiltration test with FLiNaK at 773 K and 0.103 kPa for 16 h [11]. They reported that the intrinsic C H bond in graphite partially formed during...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 11-21, October 21–24, 2019,
... that are large enough for performing conventional mechanical tests very challenging [26]. In addition, Laves phases often have extended homogeneity ranges. Deviations from the AB2 stoichiometric composition create defects in Laves phases and in some systems even lead to phase transformations from one structure...
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,
... in HiperFer 17Cr 5 and the intrinsically minimum amounts of C and N contents in a future HiperFerFG (Fusion Grade) variant greatly reduced activation by fast neutrons in a fusion reactor environment is obtainable. Furthermore, HiperFerFG comes with remarkably low Deuterium retention and good plasma sputtering...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 99-110, October 15–18, 2024,
... of the dislocation interspacing, 8' , the precipitate interspacing, 9' and the sub-grain size B, and is expressed as: :$ g1T h = ]1T8' ` + ]1TB ` + & $ ]1T9' # ` (12) In addition to the intrinsic frictional resistance, the presence of precipitates, solute atoms and dislocations in the cell wall can contribute...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 766-783, October 15–18, 2024,
... crystallographic and exhibits necking, indicating an increase in ductility [13]. Non-crystallographic cracking can also be attributed to internal cracking at casting defects and rafting of ' [35]. Reducing Tmin of the TMF cycle to 100°C tends to exacerbate the oxidation-fatigue interaction process [26, 50, 51...