[3O01-06] 被覆管材料1

11:15 〜 11:30

[3O05] Evaluation of the Hoop Tensile Behavior of Cr-coated Zircaloy-4 Fuel Cladding by Advanced Expansion Due to Compression (A-EDC) Test

*魏 子棋¹、Li Bo¹、Cui Lijuan³、Yang Zongda¹、Qiu Risheng^1,4、叶野 翔²、阿部 弘亨¹ (1. 東京大学、2. 国立研究開発法人量子科学技術研究開発機構、3. 四川大学（中国）、4. 重慶大学（中国）)

キーワード：

事故耐性燃料、クロムコーティング、改良型中子拡管試験、周方向機械強度、き裂進展

This study evaluates the mechanical behavior and strength of Cr-coated Zircaloy-4 cladding tubes under hoop tensile stress. Cr coatings were applied to Zircaloy-4 rings using the pulsed laser deposition (PLD) method. Advanced expansion due to compression (A-EDC) tests were conducted on the as-deposited specimens at room temperature and 573K. Additionally, residual stress measurements were performed using the d-sin²(Ψ) method with XRD to accurately determine the coating's strength. A quantification method for the coating's cracking behavior was established by analyzing the crack density-local strain relationship. The results demonstrated superior strength for the thin Cr coating with a nanocrystalline/amorphous structure.