scholarly journals Low Cycle Fatigue Behaviors of Alloy 617 (INCONEL 617) Weldments for High Temperature Applications

Metals ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 100 ◽  
Author(s):  
Rando Dewa ◽  
Seon Kim ◽  
Woo Kim ◽  
Eung Kim
Keyword(s):  
High Temperature ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Alloy 617 ◽  
Inconel 617 ◽  
Temperature Applications

scholarly journals Effect of Strain Range on the Low Cycle Fatigue in Alloy 617 at High Temperature

Metals ◽  
2017 ◽  
Vol 7 (2) ◽  
pp. 54 ◽  
Author(s):  
Rando Dewa ◽  
Seon Kim ◽  
Woo Kim ◽  
Eung Kim
Keyword(s):  
High Temperature ◽  
Low Cycle Fatigue ◽  
Strain Range ◽  
Cycle Fatigue ◽  
Alloy 617

Low Cycle Fatigue and Creep-Fatigue Behavior of Alloy 617 at High Temperature

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Celine Cabet ◽  
Laura Carroll ◽  
Richard Wright
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Dominant Role ◽  
Hold Time ◽  
Outlet Temperature ◽  
Cycle Fatigue ◽  
Alloy 617 ◽  
Creep Fatigue

Alloy 617 is the leading candidate material for an intermediate heat exchanger (IHX) application of the very high temperature nuclear reactor (VHTR), expected to have an outlet temperature as high as 950 °C. Acceptance of Alloy 617 in Section III of the ASME Code for nuclear construction requires a detailed understanding of the creep-fatigue behavior. Initial creep-fatigue work on Alloy 617 suggests a more dominant role of environment with increasing temperature and/or hold times evidenced through changes in creep-fatigue crack growth mechanisms and failure life. Continuous cycle fatigue and creep-fatigue testing of Alloy 617 was conducted at 950 °C and 0.3% and 0.6% total strain in air to simulate damage modes expected in a VHTR application. Continuous cycle fatigue specimens exhibited transgranular cracking. Intergranular cracking was observed in the creep-fatigue specimens and the addition of a hold time at peak tensile strain degraded the cycle life. This suggests that creep-fatigue interaction occurs and that the environment may be partially responsible for accelerating failure.

scholarly journals A review of low-cycle fatigue of Alloy 617 for use in VHTR components: Experimental outlook

2018 ◽  
Vol 159 ◽  
pp. 02049 ◽  
Author(s):  
Rando Tungga Dewa ◽  
Jeong-Hun Park ◽  
Seon-Jin Kim ◽  
Woo-Gon Kim ◽  
Eung-Seon Kim ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxidation Behavior ◽  
Low Cycle Fatigue ◽  
Strain Range ◽  
Fatigue Behaviour ◽  
Cycle Fatigue ◽  
Alloy 617 ◽  
Surface Cracking ◽  
The Matrix ◽  
Lower Temperature

The effect of strain range and temperature on the low-cycle fatigue behaviour and microstructure change during cyclic deformation of Alloy 617 for use in very high temperature gas-cooled reactor components were studied at elevated temperature starting from ambient condition. Increasing the strain range and the temperature was noticed to reduce the fatigue resistance of nickel-based Alloy 617 due to facilitating the transformation behavior of the carbides in the grain interior, precipitates along the grain boundary, and oxidation behavior inducing surface connected precipitates cracking. Initial hardening behavior was observed at room temperature condition during cyclic due to the pile-up dislocation of micro-precipitates. The grain size was also taking a role due to the formation of an obstacle in the matrix. In the high temperature regime, the alloy 617 was found to soften for its entire life due to the fast recovery deformation, proved by its higher plasticity compared with lower temperature. The deformation behavior also showing high environmentally assisted damage. Oxidation behavior was found to become the primary crack initiation, resulting in early intergranular surface cracking.

scholarly journals Effect of Grain Size on High Temperature Low-cycle Fatigue Properties of Inconel 617

1982 ◽  
Vol 68 (16) ◽  
pp. 2521-2530 ◽  
Author(s):  
Hiroshi HATTORI ◽  
Masaki KITAGAWA ◽  
Akira OHTOMO
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Low Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Inconel 617

Fracture Surface in Low Cycle Fatigue of HA-188 Cobalt Base Alloy at High Temperature

1978 ◽  
Vol 27 (292) ◽  
pp. 99-103 ◽  
Author(s):  
Kiyoshi KITA ◽  
Masanori KIYOSHIGE ◽  
Masatake TOMINAGA ◽  
Junzo FUJIOKA
Keyword(s):  
High Temperature ◽  
Fracture Surface ◽  
Base Alloy ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Cobalt Base Alloy ◽  
Cobalt Base

Features of crack propagation in steel during high-temperature low-cycle fatigue

1981 ◽  
Vol 16 (5) ◽  
pp. 417-419
Author(s):  
V. S. Ivanova ◽  
Ya. Gintsler ◽  
L. I. Maslov
Keyword(s):  
High Temperature ◽  
Crack Propagation ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue

Biaxial Thermal Creep of Alloy 617 and Alloy 230 for VHTR Applications

2014 ◽  
Author(s):  
Kun Mo ◽  
Wei Lv ◽  
Hsiao-Ming Tung ◽  
Di Yun ◽  
Yinbin Miao ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Creep ◽  
Secondary Creep ◽  
Alloy 617 ◽  
Creep Equation ◽  
Creep Stress ◽  
High Temperature Mechanical Properties ◽  
Inconel 617 ◽  
Creep Regime ◽  
Secondary Regime

In this study, we employed pressurized creep tubes to investigate the biaxial thermal creep behavior of Inconel 617 (Alloy 617) and Haynes 230 (Alloy 230). Both alloys have been considered to be the primary candidate structural materials for very high temperature reactors (VHTRs) due to their exceptional high-temperature mechanical properties. The current creep experiments were conducted at 900°C for the effective stress range of 15–35 MPa. For both alloys, complete creep strain development with primary, secondary, and tertiary regimes were observed in all studied conditions. The tertiary creep was found to be dominant in the entire creep lives of both alloys. With increasing applied creep stress, the fraction of the secondary creep regime decreases. The nucleation, diffusion, and coarsening of creep voids and carbides on grain boundaries was found to be the main reason for the limited secondary regime, and was also found to be the major cause of creep fracture. The creep curves computed using the adjusted creep equation of the form ε = Aσ cosh−1(1 + rt) + Pσntm agree well with the experimental results for both alloys at the temperatures of 850–950°C. Paper published with permission.

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