ウラニウムとMagnox A-12との関連変形

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概要

• 論文の詳細を見る

• The sheath and core material which constitutes fuel element through bonding generally functions under different conditions of temperature and atmosphere. When the rigidity of the sheath material is poorer than that of the core material, the sheath is subject to deformation to match the core under service. Hence, it seems very important to clarify such relative deformation considering the thermal fatigue behavior from the view point of the design, safety and usage of the fuel element. In our research "the universal thermal fatigue testing machine" was used which was originally designed by the authors in order to investigate the relative deformation and other various thermal fatigue phenomena in general. The experimental procedures were carried out so as to put Uranium and Magnox A-12 in separated positions. The difference in thermal strain which occurred from the difference in thermal cycling temperature ranges was accurately transmitted to Magnox A-12, and its induced stress behavior, microstructure and failure were observed. The results were as follows. (1) The restricted deformation of Magnox A-12 caused by Uranium. When Magnox A-12 is restricted by Uranium it occasions compressive stress in Mgnox at higher temperature range, and the stress in its case is very small in spite of the sudden increase in elongation which is brought about by heating Uranium above its transformation temperature. This fact shows that the deformation of Mgnox advances by creep. The increase of the cycling period from 0.5 to 4 hr. per cycle promotes tensile creep and stress relaxation at lower temperature range. The maximum stress induced in Mgnox under the restricted relative deformation caused by thermal cycling of 190℃⇔575℃ for Uranium and 150℃⇔450℃ for Magnox is higher even after 320 cycles than that of the original state. These results show that Mgnox is easily subject to the deformation of Uranium and that the Mgnox load on Uranium is very small.

• 社団法人日本材料学会の論文
• 1964-03-15

著者

• 薄井 洸

  日本原子力研究所

• 川崎 正之

  日本原子力研究所東海研究所

• 笹川 雅信

  日本原子力研究所

• 川崎 正之

  日本原子力研究所

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