By V I Lakomskii
Within the monograph, the writer summarises the implications bought in study and investigations of the gas-liquid steel approach at temperatures regular of electrical arc welding and electrometallurgy approaches. targeted awareness is given to the issues of sorption of diatomic homonuclear gases, specifically nitrogen from electrical arc plasma, by means of steel melts. it truly is proven that after the steel absorbs the gasoline from plasma the method doesn't achieve the thermodynamic equilibrium kingdom. Investigations have been performed into strategies happening within the gas-plasma layer bordering with the steel. those techniques be certain the gasoline content material of liquid metal.
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Additional info for Alloying Liquid Metal with Nitrogen from Electric ARC Plasma
That, in dilute solutions, the activity coefficient is assumed to be equal to one, then For a certain gas and metal, the value of K2 is only temperature-dependent. The temperature dependence of K2 and, hence, Ks is given by the Clausius-Clapeyron equation If is assumed to be non-dependent of temperature in its ranges studied, then, after integrating, equation (22) becomes Here K0 is the integration constant characterizing the change of the entropy of a gas when dissolving the latter in the metal bath.
1. The temperature dependences of the chemical potentials of a diatomic gas in two phases for an exoergic gas-metal system are illustrated here. e. the intersection of the curves and mg, will correspond to the equilibrium state. When in-creasing the temperature from T1 to T2 and the gas pressure being unchanged, the inequality appears and the gas begins to evolute out of solution. It will continue until the system comes to the equilibrium under the new conditions (point b) where . Therewith, it goes without saying that the gas concentration in the solution will decrease.
1. 2. 3. 4. 1. Sieverts, it is known that the dissolution in liquid metal of diatomic homonuclear gases, such as nitrogen and hydrogen, is accompanied by gas dissociation and is described by the following equation The form of existence of the above mentioned gases in a metallic solution is atomic from the point of view of the first approximation. Hence, when solving them in a liquid metal, the molecular composition of the latter changes. The process of dissolution of a gas in a metal taking into account the decomposition of a solution under equilibrium conditions between a gas in the gas phase and that in the solution is usually represented by equation The thermodynamic equilibrium of the gas-metal system, according to the distribution law, may be expressed through chemical gas potentials in the gas phase and those in the metallic solution mg in the general simplest form as follows Indices in chemical potentials indicate the form of the existence of the gas in two interacting phases: G2 in the gas phase and [G] in the metallic solution.