| Title |
The Effects of Cold Work on the Oxidation of Zirconium at 425℃ to 550℃ |
| Authors |
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) |