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By H. Cerjak

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Example text

The equilibrium constant for segregation Kseg is obtained via Kseg = kl exp( - 42 ~Ho RT ) (21) Mathematical ................................ • ~ •.. •. ••••• * ............ '0 iE *. :. ~'7 . P. 0139Wt% : . : . '. * 8 ~ :::J ~ -2 D.. 0048 Wt% 0 , -. ~,; ...... , "-:, Q) Q) . 0030 Wt% o '0 C Q) 4 Modelling of Weld Phenomena ........ * .... •.... * E Q) J- 1800 . ..... -:-... : * * * 2000 2200 2400 Temperature : * ~* 2600 . * 2800 3000 in K Fig. 2 Dependence of the coefficient of surface tension on temperature surface activity.

F;;)t>. Jc•••• o ~ ••.. O ~t01 ~~rit 1-()t;;j f},()1 f}," l),~~ ~ •••• o ~ ••.. ••.. o fb•••• O ~ 1-f;;)" 1-f;;)tO l),#- rv l),"J~ l),l),6 l),"J Peak Temperature, K Fig. 11 sions. Numerically calculated peak temperature distribution of the inclu- The peak temperatures, which the particles experience, show a wide distribution, as shown in Fig. 11. From this figure it is also observed, that more than 50 percent of the particles experience temperatures above 2240 K. This finding is particularly interesting in aspect of the stability of the oxide inclusions.

0 iE *. :. ~'7 . P. 0139Wt% : . : . '. * 8 ~ :::J ~ -2 D.. 0048 Wt% 0 , -. ~,; ...... , "-:, Q) Q) . 0030 Wt% o '0 C Q) 4 Modelling of Weld Phenomena ........ * .... •.... * E Q) J- 1800 . ..... -:-... : * * * 2000 2200 2400 Temperature : * ~* 2600 . * 2800 3000 in K Fig. 2 Dependence of the coefficient of surface tension on temperature surface activity. and where kz is a constant related to the entropy of segregation. A plot of the coefficient of surface tension on temperature for different activities of sulphur can be observed in Fig.

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