Title:	Uniaxial Low-Cycle Fatigue Study of Alloy 800H Weldments at 700 °C
Authors:	Dewa, Rando Tungga Kim, Seon.Jin Kim, Woo-Gon Kim, Eung-Seon
Citation:	DEWA, RT. KIM, S. KIM, W. KIM, E. Uniaxial Low-Cycle Fatigue Study of Alloy 800H Weldments at 700 °C. Metals, 2018, roč. 8, č. 11, s. nestránkováno. ISSN: 2075-4701
Issue Date:	2018
Publisher:	MDPI
Document type:	článek article
URI:	2-s2.0-85056360477 http://hdl.handle.net/11025/47104
ISSN:	2075-4701
Keywords in different language:	Alloy 800H;low-cycle fatigue;weldments;very high temperature reactor
Abstract in different language:	Alloy 800H is currently under consideration to be used in a very high temperature reactor system. This paper describes the experimental low-cycle fatigue study on Alloy 800H base metal and weldments in the air with fully-reversed strain control at 700 degrees C. The recommended modern Alloy 800H weldments were fabricated by gas tungsten arc welding. The observed fatigue life is found to be comparable between base metal and weldments at this temperature, indicating the welding technique can compete with base material. The influence of hold time was further investigated at the maximum tensile strain of 0.6% total strain range condition for 60 s, and it is found to reduce the fatigue life. For most of the tests, the base metal revealed an initial cyclic hardening stress response, otherwise, the weldment was entirely softened with cycles. The addition of hold time is also found to induce an unequal cyclic stress response in both materials. Accordingly, for continuous low-cycle fatigue tests, fatigue cracks were initiated and propagated in a classical transgranular fracture mode. However, the hold time affected the mixed-mode fracture mode by means of a transition from transgranular to intergranular fracture
Rights:	© authors
Appears in Collections:	Konferenční příspěvky / Conference Papers (RTI) OBD

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