Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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An Experimental Investigation on Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Alloy 617/Alloy 617 Weld Joints

Alloy 617 모재와 용접부재의 저사이클피로 거동에 관한 실험적 고찰

  • Choi, Pil-Ho (Graduate School, Pukyong National University) ;
  • Kim, Seon-Jin (Dept. of Mechanical & Automotive Engineering, Pukyong National University) ;
  • Kim, Woo-Gon (Korea Atomic Energy Research Institute) ;
  • Kim, Min-Hwan (Korea Atomic Energy Research Institute)
  • Received : 2014.08.06
  • Accepted : 2014.09.02
  • Published : 2014.10.31
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Abstract

Alloy 617 is the one of the leading candidate materials for intermediate heat exchangers(IHX) of a very high temperature reactor(VHTR) system. Some of the components are joined by many welding techniques and therefore the welded joints are inevitable in the construction of systems. In the present paper, the low cycle fatigue(LCF) behaviors of Alloy 617 base metal(BM) and the gas tungsten arc welded (GTAWed) weld joints(WJ) are investigated experimentally under strain controlled LCF tests. Fully axial total-strain controlled tests have been conducted at room temperature with total strain ranges of 0.6, 0.9, 1.2 and 1.5%. The weld joints have shown a lower fatigue lives compared with base metals at all the testing conditions. The weld joints have shown a higher cyclic stress response behavior than base metal. Both BM and WJ exhibited cyclic strain hardening behavior, depending on the total strain range. In addition, the strain-life parameters for BM and WJ were determined, based on Coffin-Manson equations.

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References

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