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Low Cycle Fatigue Behavior of Alloy617 Weldment at 850℃

850℃에서의 Alloy 617 용접재의 저사이클 피로 특성

  • Received : 2016.08.20
  • Accepted : 2016.12.17
  • Published : 2017.03.01

Abstract

Alloy 617 is one of the primary candidate materials to be used in a very high temperature reactor (VHTR) system as an intermediate heat exchanger (IHX). To investigate the low cycle fatigue behavior of Alloy 617 weldments at a high temperature of $850^{\circ}C$, fully reversed strain-controlled fatigue tests were conducted with the total strain values ranging from 0.6~1.5%. The weldment specimens were machined using the weld pads fabricated with a single V-grove configuration by gas tungsten arc welding (GTAW) process. The fatigue life is reduced as the total strain range increases. For all testing conditions, the cyclic stress response behavior of the Alloy 617 weldments exhibited the initial cyclic strain hardening phenomenon during the initial small number of cycles. Furthermore, the overall fatigue cracking and the propagation or cracks showed a transgranular failure mode.

Keywords

Low Cycle Fatugue(LCF);Gas Tungsten Arc Welding(GTAW);Weldment;Fatigue Life;Transgranular

Acknowledgement

Supported by : 한국연구재단

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