5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P1.177 Characterization of F82H HIP joints by acoustic emission

5 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 177
Poster I. Materials Technology P1 Poster session

Speaker

Takashi Nozawa (Japan Atomic Enegy Agency)

Description

The hot isostatic pressing (HIP) is the key technology to fabricate the first wall of the fusion blanket system. Generally, the Charpy impact test is applied to evaluate the failure behavior of the HIP joint however there is a drawback that this cannot be applied to the practical thin-walled first wall component since the Charpy impact test requires a long bar specimen. Alternatively the authors recently proposed the torsion test method to assess the HIP joint. The torsion method has an advantage that the test specimen can directly be obtained from the component. Besides a good correlation with the test results by the Charpy impact test was shown. The torsion method is therefore considered as a promising standard technique in qualification of the HIP joint. The performance of the HIP joint depends on the presence of sub-micron precipitates distributed on the HIP joint. However, the detailed failure mechanism of the HIP joint with or without these precipitates is still uncertain and these are primarily evaluated in this paper. To detect any failure signals during the test, the acoustic emission (AE), which has widely been used in determination of the failure location, failure mode, failure energy, etc., was first applied in the developmental torsion test. Most of AE signals were detected upon visible cracking beyond the maximum torque applied. A slight difference in the accumulation process of the AE signals was found between the bulk and the HIP joint material. In failure of the bulk material, continuous and relatively high energy AE signals were identified, while low energy AE signals were typical for the HIP joint material. Such difference is possibly due to the varied failure modes closely related to the presence of precipitates. The detailed failure behavior focusing on the AE energy will be discussed for various HIP joint materials.

Co-authors

Hiroyasu Tanigawa (Japan Atomic Enegy Agency, Rokkasho, Aomori, Japan) Ryuji Ohsone (Japan Atomic Enegy Agency, Rokkasho, Aomori, Japan) Takashi Nozawa (Japan Atomic Enegy Agency, Rokkasho, Aomori, Japan)

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