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CSME 2023/05
Volume 44 No.2
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121-131
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Enhancement of Thermal Strength and Corrosive Resistance for Rotating Cylindrical Tubes Made of FGC and FGM Using CVD-SiC and T91 When Subjected to High-temperature Sources of Gaussian Laser Boundaries
Hsin-Yi Laia and Kai-Chien Loa
aDepartment of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.
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Abstract:
Materials such as CVD-SiC and T91 martensitic-ferritic are widely used as nuclear fuel cladding base material for LWRs (light water reactors) due to their excellent high temperature and corrosive resistance under critical environmental conditions. This study is geared towards investigation of the functional graded composites (FGC) of CVD-SiC-Fe12Cr2Si and the functional graded material (FGM) of T91-Fe12Cr2Si, respectively, to meet the needs of thermal impact of LWR industry. The work-piece in a wide range of high temperature environment from 20°C to 1200°C is implemented and simulated using a 3D rotating cylindrical tube and a 2D cylindrical model with a laser quenching boundary.The linear rule of mixture and Wakashima-Tsukamoto estimate are the main algorithms of FGM in this study. The continuous material property distri-bution of FGM material can prevent stress concentra-tion and non-continuous problem of diffusion in the rotating cylindrical tube and the associated 2D cylin-drical model. Moreover, the silicon concentration of the 2D cylindrical model on the inner surface can be transformed to an oxidized layer, which enhances the corrosive resistance of FGC and FGM models.The margin of safety calculated by the tresca stress is also promoted when the volume mixture num-ber of FGM material is increased, and the materials are designed based on the Fe12Cr2Si- SiC model. This result shows the Fe12Cr2Si-SiC FGM model with a volume mixture number of three is an ideal material component for nowadays fuel cladding design being aware of LBLOCA problem.
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Keywords: functionally graded material, maximum shear stress, corrosion resistance
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©
2023
CSME , ISSN 0257-9731
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