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stress concentration

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Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1322-1329, October 21–24, 2019,
... of that of a specimen with no defects. In addition, as a result of investigating the stress concentration around a defect with a depth ratio of about 5% by the finite element method, stress concentration was clearly observed around the defect. These results suggest that taking a miniature sample up to a depth of 5...
Proceedings Papers

AM-EPRI2004, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Fourth International Conference, 672-682, October 25–28, 2004,
... of the line, though detailed results are not included. The work by Texas Genco, Stress Engineering Services, and EPRI points to the stress concentration factor associated with the internal weld profile near the failure as the primary cause, with the cyclic thermal shocks from frequent intermittent...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 491-503, October 22–25, 2013,
... management. For example, contouring of fillet regions can help to reduce stress concentrations leads to reduced plant maintenance and casting complex shapes reduces the number of onsite fabrication welds to inspect during outage regimes. castings coal fire power plants machining nickel alloys steam...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 461-472, October 15–18, 2024,
... to improve creep rupture strength and ductility, Gr.92 exhibits lower creep rupture ductility than Gr.91[13]. Low creep ductility raises concerns about notch weakening. Materials exhibiting notch weakening are at risk of preferential creep damage from stress concentration parts, such as weld toes, shape...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 336-346, October 11–14, 2016,
... as compared to concentrated magnesium chloride. On the other hand, sulphate containing solutions may act less detrimental due to their higher pitting potentials. 4x conc seawater (30:1) 15% MgCl26H2O (105:1) Figure 9: Intergranular pitting corrosion of sensitized HR3C at 80°C after 5000s 340 3. Stress...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 135-146, October 15–18, 2024,
... out of the material, the helium can remain trapped. Upon cooling, the residual stresses, combined with weakened grain boundaries due to helium coalescence, can lead to cracking. The current ASME limit for helium content for Code repairs is 0.1 appm. Prior work has demonstrated a strong inverse...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 47-59, October 21–24, 2019,
... by concentration gradient due to segregation which increases driving force of diffusion. It has been expected, consequently, that the creep strength and allowable stress of Grade 91 steels can be increased by proper process of fabrication to obtain a homogenized material free from undue segregation. alloying...
Proceedings Papers

AM-EPRI2010, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Sixth International Conference, 732-751, August 31–September 3, 2010,
... at half yield with decrease in stress. It was considered to be caused by inhomogeneous recovery at the vicinity of prior austenite grain boundary, because creep deformation was concentrated in a tiny recovered area. High creep rupture ductility of Grade P23 steel should be associated with its lower creep...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 11-21, October 21–24, 2019,
... of experimental results obtained by micromechanical testing of single-crystalline NbCo 2 Laves phase samples with varying crystal structure, orientation, and composition. For this purpose, diffusion layers with concentration gradients covering the complete homogeneity ranges of the hexagonal C14, cubic C15...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 356-364, October 11–14, 2016,
... and high residual stress in neutral zone as compared other regions like intrados and extrados. Therefore, failure occurred in neutral zone due to stress relaxation concentrated in grain boundary during operation. austenitic stainless steel tubes creep strength failure analysis grain boundary...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 702-713, October 22–25, 2013,
... stress redistribution due to creep deformation, stress and strain concentrations were observed inside the HAZ region. Then, the authors' creep life prediction model was applied to the creep test result to examine its validity to actual size pipes. It was demonstrated that the life prediction model can...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 582-591, October 15–18, 2024,
... the most serious life reduction. The welded joints using ER NiCr-3 filler metal reduced the strain concentration at the interface, so the fracture location shifted from the interface to HAZ of 10%Cr martensitic heat-resistant steel under high temperature and low stress conditions, and creep rupture life...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1380-1388, October 21–24, 2019,
... in # phase regions near phase boundaries shown in Fig. 7 is suggested to be caused by the stress concentration at the phase boundaries which comes from plastic strain in ! grains. Figure 6: High magnification of (a) secondary electron image and (b) strain map after fracture in " grain region shown in Fig. 5...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1446-1456, October 21–24, 2019,
... 10 Schematic illustrations of deformation behaviour along (a, c) grain boundary and (b, d) %nterphase. followed by pile-up of these dislocations along boundaries takes place. In this moment, the stress concentration field occurs along boundaries (Figs. 10 (a, b If this boundary is and the adjacent...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 416-425, October 21–24, 2019,
... reported as follows: oxide notches [10, 19, 20], creep voids nucleation around type carbides [10, 21], interfacial stress concentration induced by mismatch of thermal expansion coefficients [10, 22, 23], and the uneven creep strength of the interfacial region [10]. The above shows that creep behaviors...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 1098-1112, October 11–14, 2016,
... active at too low strain rates. A comparable correlation is not known for hydrogen-induced stress corrosion cracking. The hydrogen produced by the cathodic reaction diffuses into the material until it is saturated. Below saturation level, the local concentration in the area of the crack tip increases...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 336-347, October 21–24, 2019,
..., suggesting no change in the amount of BN particles during creep. On the other hand, the AlN particles gradually form during creep at 550 to 700 °C, decreasing the concentration of nitrogen free from the AlN particles. The degradation in creep life takes place more significantly with test duration...
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,
... Abstract This study examines the corrosion resistance of additively manufactured 316L stainless steel (SS) for nuclear applications across three environments: pressurized water reactor primary water (PWR PW), hot concentrated nitric acid, and seawater. Wire-feed laser additive manufacturing...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 147-158, October 15–18, 2024,
... concentrations for matrix strength and stability. The JMP steels showed increases in creep life compared to MARBN/SAVE12AD at 650°C for testing at various stresses between 138 MPa and 207 MPa. On a Larson-Miller plot, the performance of the JMP steels surpasses that of state-of-the-art MARBN steel. Approximately...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 528-539, October 15–18, 2024,
... Abstract The steam generation systems (SGS) of concentrated solar power (CSP) plants employ multiple heat exchangers arranged in series to convert thermal energy collected from the sun via a heat transfer fluid (HTF) to produce superheated steam in the Rankine cycle. Common CSP plant designs...