Macro and Microscopic Investigation on Fracture Specimen of Alloy 617 Base Metal and Weldment in Low Cycle Fatigue Regime

저사이클 피로 영역에서의 Alloy 617 모재와 용접재의 파괴 시험편에 대한 거시적 및 미시적 관찰

Kim, Seon Jin;Dewa, Rando Tungga;Kim, Woo Gon;Kim, Eung Seon
김선진;랜도 디와;김우곤;김응선

  • Received : 2016.01.19
  • Accepted : 2016.04.27
  • Published : 2016.06.01


This paper investigates macro- and microscopic fractography performed on fracture specimens from low cycle fatigue (LCF) testings through an Alloy 617 base metal and weldments. The weldment specimens were taken from gas tungsten arc welding (GTAW) pad of Alloy 617. The aim of the present study is to investigate the macro- and microscopic aspects of the low cycle fatigue fracture mode and mechanism of Alloy 617 base metal and GTAWed weldment specimens. Fully axial total strain controlled fatigue tests were conducted at room temperature with total strain ranges of 0.6, 0.9, 1.2 and 1.5%. Macroscopic fracture surfaces of Alloy 617 base metal specimens showed a flat type normal to the fatigue loading direction, whereas the GTAWed weldment specimens were of a shear/star type. The fracture surfaces of both the base metal and weldment specimens revealed obvious fatigue striations at the crack propagation regime. In addition, the fatigue crack mechanism of the base metal showed a transgranular normal to fatigue loading direction; however, the GTAWed weldment specimens showed a transgranular at approximately $45^{\circ}$ to the fatigue loading direction.


Low Cycle Fatigue(LCF);Gas Tungsten Arc Welding(GTAW);Fracture Mode and Mechanism;Weldment


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Supported by : 한국연구재단