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22℃ 에서 동내의 수소 확산에 미치는 격자 공자 및 전위의 영향
김기태,김석수,변수일 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.6
The effects of vacancies and dislocations on the hydrogen diffusion in Cu have been studied at 22℃ by using electrochemical permeation technique. Two kinds of specimens were prepared from cold-rolled Cu specimens. One batch (A) of this material was annealed for 5 min at 950℃ and then quenched in cold water prior to reannealing for various times at 80 and/or 150℃. The other (B) was annealed either for 24 h at 150℃ or for 24 h at 750℃. Hydrogen diffusivity has been measured in the quenched specimen as a function of annealing for various times at 80 and/or 150 ℃. Electrical resistivity measurements of the quenched specimen A indicate that lattice vacancies are annihilated with reannealing at 80 ℃. As reannealing Time increases, the diffusivity increases, suggesting that the vacancies act as trap sites of hydrogen. The apparent diffusivity of hydrogen in the cold -rolled specimen annealed at 750 ℃ is slightly higher than that in the cold-rolled specimen annealed at 150 ℃, suggesting that the dislocations hardly act as trap sites of hydrogen in Cu contrary to BCC metals.
입계편석 (粒界偏析)된 P 가 고온의 Ca (No3) 2 용액에서 연강의 응력부식파괴 및 그 기구에 미치는 영향
김기태,변수일,이성민 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.7
Effects of grain boundary segregation of phosphorus (P) on the stress corrosion cracking (SCC) and on the SCC mechanism of mild steal in hot 55% Ca(NO₃)₂ soultion have been investigated by using the slow strain rate and constant load methods. The SCC susceptibility was examined as a function of applied potential, strain rate and test temperature. The extent of P segregation effect on SCC is greatly affected by the kinetics of dissolution of passivating film developed on the specimen surface depending upon the SCC test condition. That is, the effect of P segregation at grain boundaries is revealed markedly in the presence of stab1e passive films on the specimen surfaces. This result is discussed in terms of the stability of passivating films as a function of applied potential, strain rate, test temperature and loading method. The IGC susceptibility seams to be necessary for the occurrence of SCC susceptibility in case of the P-doped mild steel. From the experimental SCC results and SEM fractography, the SCC mechanism of mild steel proved to be strain-induced anodic dissolution irrespective of grain boundary segregation of P.