[논문]Measurement of Fracture Toughness of Pure Tungsten Using a Small-Sized Compact Tension Specimen

Kong, Byeong Seo; Shin, Ji Ho; Jang, Changheui; Kim, Hyoung Chan

doi:10.3390/ma13010244

[해외논문] Measurement of Fracture Toughness of Pure Tungsten Using a Small-Sized Compact Tension Specimen 원문보기

Materials, v.13 no.1, 2020년, pp.244 -

Kong, Byeong Seo (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea) , Shin, Ji Ho (assaultpc@kaist.ac.kr (B.S.K.)) , Jang, Changheui (shinjiho@kaist.ac.kr (J.H.S.)) , Kim, Hyoung Chan (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea)

Abstract ▼ AI-Helper

The evaluation of fracture toughness of pure tungsten is essential for the structural integrity analysis in a fusion reactor. Therefore, the accurate quantification of fracture toughness of tungsten alloys is needed. However, due to the inherent brittleness of tungsten, it is difficult to introduce a sharp fatigue pre-crack needed for the fracture toughness test. In this study, a novel fatigue pre-cracking method was developed and applied to the small-sized disc-type compact tension (DCT) specimens of double-forged pure tungsten. To overcome the brittleness and poor oxidation resistance, a low-frequency tensile fatigue pre-cracking was performed at 600 °C in Ar environment, which resulted in the introduction of a sharp pre-crack to DCT specimens. Then, fracture toughness tests were conducted at room temperature (RT), 400 °C, and 700 °C in air and Ar gas environments using as-machined and pre-cracked DCT specimens. At RT and 400 °C, the test environment and crack tip radius did not affect the fracture toughness measurement. However, at 700 °C, the Ar gas environment and the presence of a sharp fatigue pre-crack resulted in a decrease in the measured fracture toughness. Thus, it was suggested that, for the conservative fracture toughness measurement of pure tungsten, fatigue pre-cracking and fracture toughness test should be performed in an inert environment, especially for high-temperature tests.

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