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Vol.8, No.4, 191 ~ 198, 1971

Title

The Effects of Cold Work on the Oxidation of Zirconium at 425℃ to 550℃

이기순 Key S Lee , 이병휘 Byoung W Lee , 박평주 Pyung C Park

Abstract

The cold work dependence of the change of oxidation rate was studied. Specimens cut into 2.0 ㎜ thickness disk from zirconium rod (99.9%) were annealed in the vaccum tube furnace at 800℃ for 1 hour, and than uniaxially cold compressed from 0 to 30% with 10% increment. The oxidation rate was decreased with increase in the degree of cold work. The activation energy was calculated to be 36.6 and 45.7 ㎉/mole for low temperature (425-490℃) and high temperature region (490℃-550℃), respectively. The constant of Arrhenius rate equation was dependent variable of the degree of cold work (D%) and best expressed by the following from A_d=A_o (1-0.008D). The cold work dependent rate can be expressed as follows: 425℃-490℃ K_c=1.85×10^(-5)(1-0.008D) exp (-36.000/RT) 490℃-550℃ K_c=6.95×10^(-3)(1-0.008D) exp (-45.700/RT)

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