scholarly journals Strength of Materials at Elevated Temperatures. Long Term Creep-Rupture Properties and Microstructure of Weld Metal on 2.25Cr-1Mo Steel Thick Plate.

1999 ◽  
Vol 48 (2) ◽  
pp. 122-129 ◽  
Author(s):  
Takashi WATANABE ◽  
Masayoshi YAMAZAKI ◽  
Hiromichi HONGO ◽  
Junichi KINUGAWA ◽  
Tatsuhiko TANABE ◽  
...  
Keyword(s):  
Weld Metal ◽  
Thick Plate ◽  
Elevated Temperatures ◽  
Creep Rupture ◽  
Strength Of Materials ◽  
Term Creep ◽  
Rupture Properties

Investigation on long-term creep rupture properties and microstructure stability of Fe–Ni based alloy Ni–23Cr–7W at 700°C

2013 ◽  
Vol 565 ◽  
pp. 285-291 ◽  
Author(s):  
Tsuyoshi Tokairin ◽  
Kristian Vinter Dahl ◽  
Hilmar Kjartansson Danielsen ◽  
Flemming Bjerg Grumsen ◽  
Takashi Sato ◽  
...  
Keyword(s):  
Creep Rupture ◽  
Microstructure Stability ◽  
Term Creep ◽  
Rupture Properties

scholarly journals Precipitation Behavior of Long Term Creep-Rupture in Low Carbon-Medium Nitrogen Type 16Cr-8Ni-2Mo Weld Metal.

2003 ◽  
Vol 52 (2) ◽  
pp. 179-184 ◽  
Author(s):  
Hiromichi HONGO ◽  
Masayoshi YAMAZAKI ◽  
Takashi WATANABE ◽  
Tatsuhiko TANABE ◽  
Yoshio MONMA
Keyword(s):  
Weld Metal ◽  
Creep Rupture ◽  
Low Carbon ◽  
Precipitation Behavior ◽  
Term Creep

scholarly journals Effects of Grain Boundary Precipitates on Long-Term Creep Rupture Properties of SUS347H Steel

1997 ◽  
Vol 83 (1) ◽  
pp. 72-77 ◽  
Author(s):  
Hideo TANAKA ◽  
Masaharu MURATA ◽  
Fujio ABE ◽  
Koichi YAGI
Keyword(s):  
Grain Boundary ◽  
Creep Rupture ◽  
Term Creep ◽  
Rupture Properties

scholarly journals Strength of Materials at Elevated Temperatures. Creep Deformation Behavior of Weld Metal and Heat Affected Zone on 316FR Steel Thick Plate Welded Joint.

1999 ◽  
Vol 48 (2) ◽  
pp. 116-121 ◽  
Author(s):  
Hiromichi HONGO ◽  
Masayoshi YAMAZAKI ◽  
Takashi WATANABE ◽  
Junichi KINUGAWA ◽  
Tatsuhiko TANABE ◽  
...  
Keyword(s):  
Weld Metal ◽  
Creep Deformation ◽  
Heat Affected Zone ◽  
Deformation Behavior ◽  
Thick Plate ◽  
Elevated Temperatures ◽  
Welded Joint ◽  
Strength Of Materials

Evaluation of Short- and Long-Term Creep Rupture Properties for Grade 91 Materials

2005 ◽  
Author(s):  
Marvin J. Cohn
Keyword(s):  
Good Method ◽  
Creep Rupture ◽  
Material Degradation ◽  
Rupture Data ◽  
Short And Long Term ◽  
Grade 91 ◽  
Metal Properties ◽  
Term Creep ◽  
Rupture Properties

Recent literature indicates that there is a concern regarding the short-term vs. long-term creep rupture base metal properties for Grade 91 material. Evaluations of recent creep rupture data suggest that the material properties degrade more severely than expected and extrapolated creep rupture properties may be very optimistic. One of the approaches to evaluate creep rupture data is with a parameterized master curve such as the Larson-Miller parameter. Evaluations of creep rupture data indicate that the effects of material degradation can be considered with appropriate stress, time and temperature relationships. Using the Larson-Miller parameter methodology, the selected heats of Grade 91 creep rupture data indicate a reasonable relationship that does not appear to degrade rapidly for the longer term data. If even longer term creep rupture data suggest severe aging degradation as compared to current extrapolations, a transition of the Larson-Miller parameter constant from 31 to 20 does not appear to be a good method to calculate the degraded life estimates. As longer term creep rupture data become available, resulting oxide thicknesses should be measured and reported. The adverse effect of oxidation at longer times, resulting in loss of material and effectively higher stress, should be evaluated.

scholarly journals Long Term Creep Rupture Properties and Microstructure of 12% Cr Heat Resisting Steels

1982 ◽  
Vol 68 (16) ◽  
pp. 2541-2550
Author(s):  
Ik-Min PARK ◽  
Toshio FUJITA
Keyword(s):  
Creep Rupture ◽  
Term Creep ◽  
Rupture Properties

A Postassessment Test of 100,000 h Creep Rupture Strength of Grade 91 Steel at 600 °C

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
K. Maruyama ◽  
N. Sekido ◽  
K. Yoshimi
Keyword(s):  
Rupture Strength ◽  
Creep Rupture ◽  
Creep Rupture Strength ◽  
Data Points ◽  
Predicted Values ◽  
Grade 91 ◽  
Term Creep ◽  
Term Data ◽  
Grade 91 Steel

Predictions as to 105 h creep rupture strength of grade 91 steel have been made recently. The predicted values are examined with long-term creep rupture data of the steel. Three creep rupture databases were used in the predictions: data of tube products of grade 91 steel reported in National Institute for Materials Science (NIMS) Creep Data Sheet (NIMS T91 database), data of T91 steel collected in Japan, and data of grade 91 steel collected by an American Society of Mechanical Engineers (ASME) code committee. Short-term creep rupture data points were discarded by the following criteria for minimizing overestimation of the strength: selecting long-term data points with low activation energy (multiregion analysis), selecting data points crept at stresses lower than a half of proof stress (σ0.2/2 criterion), and selecting data points longer than 1000 h (cutoff time of 1000 h). In the case of NIMS T91 database, a time–temperature parameter (TTP) analysis of a dataset selected by multiregion analysis can properly describe the long-term data points and gives the creep rupture strength of 68 MPa at 600 °C. However, TTP analyses of datasets selected by σ0.2/2 criterion and cutoff time of 1000 h from the same database overestimate the data points and predict the strength over 80 MPa. Datasets selected by the same criterion from the three databases provide similar values of the strength. The different criteria for data selection have more substantial effects on predicted values of the strength of the steel than difference of the databases.

scholarly journals Creep rupture properties of bare and coated polycrystalline nickel-based superalloy Rene®80

2021 ◽  
pp. 36-36
Author(s):  
M.M. Barjesteh ◽  
S.M. Abbasi ◽  
K.Z. Madar ◽  
K. Shirvani
Keyword(s):  
Elevated Temperatures ◽  
Life Time ◽  
Creep Rupture ◽  
Polycrystalline Nickel ◽  
Creep Life ◽  
Nickel Based Superalloy ◽  
Platinum Aluminide ◽  
Rupture Properties ◽  
Low Activity ◽  
Rupture Behavior

Creep deformation is one of the life time limiting reasons for gas turbine parts that are subjected to stresses at elevated temperatures. In this study, creep rupture behavior of uncoated and platinum-aluminide coated Rene?80 has been determined at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 Mpa in air. For this purpose, an initial layer of platinum with a thickness of 6?m was applied on the creep specimens. Subsequently, the aluminizing were formed in the conventional pack cementation method via the Low Temperature-High Activity (LTHA) and High Temperature-Low Activity (HTLA) processes. Results of creep-rupture tests showed a decrease in resistance to creep rupture of coated specimen, compared to the uncoated ones. The reductions in rupture lives in LTHA and HTLA methods at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 MPa were almost (26% and 41.8%), (27.6% and 38.5%) and (22.4% and 40.3%), respectively as compared to the uncoated ones. However, the HTLA aluminizing method showed an intense reduction in creep life. Results of fractographic studies on coated and uncoated specimens indicated a combination of ductile and brittle failure mechanisms for all samples. Although, the base failure mode in substrate was grain boundary voids, cracks initiated from coating at 760?C/657MPa and 871?C/343. No cracking in the coating was observed at 982?C/190MPa.

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