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creep analysis

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Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 466-477, October 11–14, 2016,
... Abstract A methodology is developed for evaluating its creep rupture life from analysis of an on-going creep curve with the aid of an Ω creep curve equation. The method is applied to on-going creep curves of grade 91 steel for evaluating their rupture lives. Quick decrease in creep rupture...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 1300-1312, October 15–18, 2024,
... more than 160 heats and 2,400 creep testing data, covers a wide spectrum of elemental compositions and product forms. To perform a prudent analysis of the creep property dataset, a statistical overview was first implemented to understand the data distribution relevant to data sources, chemistries...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 347-355, October 11–14, 2016,
... steel with the extension of service time, sigma precipitates form at grain boundaries by continuous chain. Sigma precipitates are hard and brittle, weaken grain boundaries and cause microscopic damage, eventually lead to boiler tubes failure. austenitic stainless steel creep failure analysis...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 219-234, October 15–18, 2024,
..., and Repair for Power Plants: Proceedings from the Tenth International Conference October 15 18, 2024, Bonita Springs Florida, USA httpsdoi.org/10.31399/asm.cp.epri2024p0219 Copyright © 2024 ASM International® All rights reserved. www.asminternational.org CREEP CAVITATION IMAGING AND ANALYSIS IN 9%CR 1%MO P91...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 702-713, October 22–25, 2013,
... portion of the test pipe and voids density was measured along the thickness direction in the HAZ region. To clarify the stress/strain distribution in the welded portion, creep analysis was conducted on the test pipe, where the materials are assumed to consist of base metal, weld metal and HAZ. After...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1282-1293, October 21–24, 2019,
... considered that the fractal dimension of the grain boundary in FGHAZ could be an indication of creep damage and studied its change as creep proceeded. First, creep tests were conducted to produce damaged materials, and their fractal dimensions were measured. Next, FEM analysis was conducted to obtain...
Proceedings Papers

AM-EPRI2010, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Sixth International Conference, 530-553, August 31–September 3, 2010,
.... Two forms of simplified method will be described. Use of a creep analysis reflects the change from elastic to steady state. A limit load analysis gives stress distributions varying from elastic to a distribution representing rupture, depending on inelastic strain. Thus use can be made of the whole...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 169-180, October 11–14, 2016,
... a simulated structure made of 23Cr-45Ni-6W alloy (HR6W) [12], which is one of the materials being considered for making large-diameter piping, creep analysis was carried out through the FEM analysis. EXPERIMENTAL The material of the test pieces was HR6W, which has the nominal chemical composition shown...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1330-1339, October 21–24, 2019,
... of the observed parts *2) fracture TF*1) 2.5~3.0 test time (hr) 1117*2) 1054 934 454 2049*2) 1321 1031 Stress analysis of test pieces The observation cross section should be satisfy three conditions; a) TF is larger than 2. b) Maximum principal stress and TF uniformly distribute. c) Creep damage is maximum...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1322-1329, October 21–24, 2019,
... of taking miniature sample scoops on the creep life of a pipe. This paper, reports on the results of internal pressure creep tests and FE analysis on ASME Grade 91 steel pipes with defects on their outer surface, which simulate sampling scoops. EXPERIMENTAL PROCEDURE Materials The two types of material...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 1244-1255, October 22–25, 2013,
... analysis to determine a set of calibration curves for inferring strain at any given vertical displacement. Some creep strain data are also presented. creep strain displacement finite element analysis small punch creep test test specimens Advances in Materials Technology for Fossil Power Plants...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 1182-1193, October 11–14, 2016,
... methodology to identify welds suspected to have received non-standard PWHT cycles on Grade 91 pipework systems. KEY WORDS Grade 91 creep resistant steel / post weld heat treatment / TIG weld process / MMA weld process / mechanical tests / dilatometry / SEM / TEM analysis INTRODUCTION Grade 91 is a creep...
Proceedings Papers

AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 125-130, October 11–14, 2016,
... for the analysis on Alloy 617 and Alloy 740, respectively. The data were obtained by Special Metals. In these temperature ranges, Ni3Al can precipitate in Alloy 617 and Alloy 740 during creep. The maximum time to rupture was 40,126.7 and 24,066 h for Alloy 617 and Alloy 740, respectively. The rupture data...
Proceedings Papers

AM-EPRI2019, 2019 Joint EPRI – 123HiMAT International Conference on Advances in High-Temperature Materials, 1048-1059, October 21–24, 2019,
... good creep ductility due to the absence of γ’ phase precipitates. A method to evaluate stress relaxation cracking susceptibility was developed by applying a three-point bending test using a specimen with a V-notch and finite element analysis (FEA), and it was shown that stress relaxation cracking...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 1269-1278, October 15–18, 2024,
... the analysis results. And then LCF and creep considering the actual operating conditions were evaluated. The calculated life of fatigue and creep life is compared to the hot gas path inspection interval. For the rejuvenated blades, the creep life and the LCF interval were reviewed based on the temperature...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 690-701, October 22–25, 2013,
... fraction rule as almost 110,000 h. Finite-element analysis was also conducted to assess the damage and remaining life, and the results were compared with the experimental results. creep damage creep rupture test creep-strength enhanced ferritic steel fine-grain heat-affected zone finite-element...
Proceedings Papers

AM-EPRI2010, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Sixth International Conference, 705-714, August 31–September 3, 2010,
... Abstract A new methodology challenges the conventional use of a constant C-value in the Larson-Miller Parameter (LMP) for 9-12% Cr ferritic steels, proposing instead a multi-C region analysis to address creep strength breakdown issues. Using NIMS data and other publications, the study...
Proceedings Papers

AM-EPRI2024, Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference, 1195-1206, October 15–18, 2024,
... samples. creep cavitation creep damage creep strength enhanced ferritic steel heat affected zone inclusions microstructural analysis post weld heat treatment Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings from the Tenth International Conference October 15 18...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 732-743, October 22–25, 2013,
... Abstract Conventional time-temperature-parameter (TTP) methods often overestimate long-term creep rupture life of creep strength enhanced high Cr ferritic steels. The cause of the overestimation is studied on the basis of creep rupture data analysis on Gr.91, 92 and 122 steels. There are four...
Proceedings Papers

AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 586-595, October 22–25, 2013,
...-term creep test results and the precise precipitation analysis will be disclosed by the presentation. creep strain curves creep strength creep test electron backscatter diffraction ferritic stainless steel microstructure degradation misorientation precipitation strengthening transmission...