[3O01-06] Cladding Materials 1

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

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

*Ziqi Wei¹, Bo Li¹, Lijuan Cui³, Zongda Yang¹, Risheng Qiu^1,4, Sho Kano², Hiroaki Abe¹ (1. The University of Tokyo, 2. QST, 3. Sichuan Univ., 4. Chongqing Univ.)

Keywords:

Accident Tolerant Fuels,Cr coating,Advanced Expansion due to Compression Test,Hoop strength,Crack propagation

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 RT 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.