scholarly journals Fatigue and creep-fatigue testing of steam filled tubular Alloy 800 specimens

1982 ◽  
Author(s):  
W B Jones ◽  
J A Van Den Avyle
Keyword(s):  
Fatigue Testing ◽  
Alloy 800 ◽  
Creep Fatigue

scholarly journals Microstructure evolution of alloy 709 during static-aging and creep-fatigue testing

2021 ◽  
Vol 801 ◽  
pp. 140361
Author(s):  
T.D. Porter ◽  
Z. Wang ◽  
E.P. Gilbert ◽  
M.J. Kaufman ◽  
R.N. Wright ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Fatigue Testing ◽  
Creep Fatigue

scholarly journals Determination of the Creep-Fatigue Interaction Diagram for Alloy 617

2016 ◽  
Author(s):  
J. K. Wright ◽  
L. J. Carroll ◽  
T.-L. Sham ◽  
N. J. Lybeck ◽  
R. N. Wright
Keyword(s):  
Fatigue Testing ◽  
Hold Time ◽  
Strain Range ◽  
Fatigue Tests ◽  
Alloy 617 ◽  
Interaction Diagram ◽  
Creep Fatigue ◽  
Intermediate Heat Exchanger ◽  
Cycles To Failure

Alloy 617 is the leading candidate material for an intermediate heat exchanger for the very high temperature reactor (VHTR). As part of evaluating the behavior of this material in the expected service conditions, creep–fatigue testing was performed. The cycles to failure decreased compared to fatigue values when a hold time was added at peak tensile strain. At 850°C, increasing the tensile hold duration continued to degrade the creep–fatigue resistance, at least to the investigated strain–controlled hold time of up to 60 minutes at the 0.3% strain range and 240 minutes at the 1.0% strain range. At 950°C, the creep–fatigue cycles to failure are not further reduced with increasing hold duration, indicating saturation occurs at relatively short hold times. The creep and fatigue damage fractions have been calculated and plotted on a creep–fatigue interaction D–diagram. Test data from creep–fatigue tests at 800 and 1000°C on an additional heat of Alloy 617 are also plotted on the D–diagram.

Application of Damage Concepts to Predict Creep-Fatigue Failures

1979 ◽  
Vol 101 (3) ◽  
pp. 284-292 ◽  
Author(s):  
J. Lemaitre ◽  
A. Plumtree
Keyword(s):  
High Temperature ◽  
High Frequency ◽  
Low Frequency ◽  
Strain Range ◽  
Ofhc Copper ◽  
Unified Approach ◽  
Alloy 800 ◽  
Sequential Tests ◽  
Creep Fatigue ◽  
Fatigue Failures

The damage concept has been developed in terms of strain range in order to give a unified approach to high temperature failure. Interactive tests have been carried out on OFHC copper at 540°C and Sanicro 31 (Alloy 800) at 600°C. For the former, combined strain controlled low frequency and high frequency tests were undertaken whereas the latter metal was subjected to sequential tests involving monotonic creep and high frequency cycling. The damage concept based on non-linear accumulation predicted lives which were in agreement with those observed experimentally for the two materials.

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