Thermal fatigue failure enhancement for FGM coolant pipes subject to high-temperature and hydrostatic lateral pressure

Kai Chien Lo, Hsin Yi Lai

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

This paper intends to enhance the corrosion resistance of coolant pipes in thermal fatigue conditions and lateral hydrostatic pressure in critical engineering environments. This research applies to circular coolant pipes under hydrostatic pressure of the LBE (lead-bismuth eutectic) boundary in nuclear power plants. The resistance against corrosion caused by liquid LBE is mainly formed by Fe12Cr2Si solid solutions coatings on the pipe. The silicon concentration in Fe12Cr2Si can interact with LBE as an effective oxidized compound such as SiO2 and Fe2SiO4 when the silicon concentration is above 1.25 wt%. The oxide film formed on the coating can resist the LBE corroding in the Fe12Cr2Si structure. The primary material for constructing a coolant pipe is T91 ferritic-martensitic alloys, and the surface anti-corrosion coating is Fe12Cr2Si solid solution. With a high-strength structure, FGC (functionally graded composite material) ensures that the pipe resists the corrosion from Liquid LBE. This study evaluates the thermal fatigue failure of coolant pipes and the silicon concentration when the pipe model is under thermal shock testing by a CO2 laser. The research result indicates that the FGM (functionally graded material) structure performs better in effectively raising the margin of safety and reserving the silicon concentration on the inner surface higher than 1.25 wt% as compared to the FGC structure.

原文English
頁(從 - 到)6319-6336
頁數18
期刊Mechanics of Advanced Materials and Structures
31
發行號24
DOIs
出版狀態Published - 2024

All Science Journal Classification (ASJC) codes

  • 土木與結構工程
  • 一般數學
  • 一般材料科學
  • 材料力學
  • 機械工業

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