Fatigue Damage Behavior in TIG Welded Joint of F82H Steel  under Low Cycle Fatigue Loading

Kim, Dong-Hyun; Park, Ki-Won

doi:2015.33.6.42

J Weld Join > Volume 33(6); 2015 > Article

Research Paper

Journal of Welding and Joining 2015;33(6):42-48.
DOI: https://doi.org/10.5781/JWJ.2015.33.6.42 Published online December 31, 2015.

Fatigue Damage Behavior in TIG Welded Joint of F82H Steel under Low Cycle Fatigue Loading

Dong-Hyun Kim^*, Ki-Won Park^**

Correspondence: Dong-Hyun Kim,
Email: dhkim@ysu.ac.kr

Abstract

Reduced activation ferritic/martensitic steels are recognized as the primary candidate structural materials for fusion blanket systems. Welding is an inevitable for breeding blanket for pressure tightness and radioisotope confinement. Especially, TIG welding was chosen for sealing because it has the largest gap allowance compared to the other welding methods, and its properties are controllable by feed wire and welding conditions. In this study, the low cycle fatigue test using two-type gage such as extensometer and strain gage was applied to the TIG welded joint of F82H steel, for evaluating fatigue damage accumulation behavior of the HAZs. As the result, the over-tempered HAZ have shown a higher fatigue damage accumulation compared with other materials at all the testing conditions.

Key Words: RAFs, TIG welding, Low cycle fatigue, HAZ, F82H steel, Vickers hardness