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Metals 2016, 6(5), 100; doi:10.3390/met6050100

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

1
Department of Mechanical Design Engineering, Pukyong National University, Busan 608-739, Korea
2
Korea Atomic Energy Research Institute (KAERI), Daejeon 305-353, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Casalino
Received: 15 March 2016 / Revised: 20 April 2016 / Accepted: 25 April 2016 / Published: 28 April 2016
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Abstract

In this study, we comparatively investigate the low cycle fatigue behavior of Alloy 617 (INCONEL 617) weldments by gas tungsten arc welding process at room temperature and 800 °C in the air to support the qualification in high temperature applications of the Next Generation-IV Nuclear Plant. Axial total-strain controlled tests have been performed with the magnitude of strain ranges with a constant strain ratio (Rε = 1). The results of fatigue tests consistently show lower fatigue life with an increase in total strain range and temperature at all testing conditions. The reduction in fatigue life may result from the higher cyclic plastic strain accumulation and the material ductility at high temperature conditions. A constitutive behavior of high temperature by some cyclic hardening was observed. The occurrence of serrated yielding in the cyclic stress response was also observed, suggesting the influence of dynamic strain aging during high temperature. We evaluated a well-known life prediction model through the Coffin-Manson relationship. The results are well matched with the experimental data. In addition, low cycle fatigue cracking occurred in the weld metal region and initiated transgranularly at the free surface. View Full-Text
Keywords: alloy 617; low cycle fatigue (LCF); gas tungsten arc welding (GTAW); weldment; high temperature; dynamic strain aging (DSA); life prediction; fracture behavior alloy 617; low cycle fatigue (LCF); gas tungsten arc welding (GTAW); weldment; high temperature; dynamic strain aging (DSA); life prediction; fracture behavior
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dewa, R.T.; Kim, S.J.; Kim, W.G.; Kim, E.S. Low Cycle Fatigue Behaviors of Alloy 617 (INCONEL 617) Weldments for High Temperature Applications. Metals 2016, 6, 100.

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