Abstract
Thermo-Time Treatment of multicomponent melting can be foreshadowed by the polythermal diagrams analysis of main physical and chemical properties, which are considered for this purpose as structural-sensitive properties: viscosity, surface tension, density or electrical conductivity [1]. Critical temperature (Tcr), i.e. temperature at which or around which, must run Thermo-Time Treatmenthas been experimentally marked by a sudden and seemingly contradictory deviation on polythermal diagrams of surface tension, s(T), reached out at cooling process for Ni base studied superalloy (MSRR 7045). A possible mathematical processing of it, is given by interpolation curves of the surface tensiondependence on temperature.
Highlights
The ideas underlying genetics, metallurgical heredity respectively, appeared in more than 50 years ago in different references [1-19]
Prediction of treatment in liquid phase represents the analysis of polythermal diagrams of main physical and chemical properties: viscosity, density, surface tension and electrical conductivity.The dynamic premise of the link between heredity of the metallic melting and their sensitivestructural properties indicated the so-called critical temperatures as optimal factor in determining the proper Thermo-Time Treatment [1, 2]
According to data from literature [1, 2], the critical temperature means the temperature at which or around which must take place theabove treatment in order to reach the desired effect, namely, “relaxation” of metallic melting- the proximity to the structural balance and the possibility of micro-homogenization.Critical temperature has been experimentally marked by a sudden and seemingly contradictory deviation on polythermal diagrams properties on any of the sensitive-structural properties.Structural-sensitive propertyconsidered in this article was the surface tension.Taking into account the qualitative aspect of these determinations par excellence, whose purpose was to estimate the critical temperature and not a rigorous quantitative determination of the structural sensitive pair properties:surface tension-density, only the surface tension was determined at the surface of the bathfor alloy in question
Summary
Method of measuring surface tension used in determining the critical temperature is known as: maximum pressure in the gas bubble. Experimental unit for determining surface tension Principle scheme of the pilot unit for measuring the surface tension by the maximum pressure in gas bubble method for a metallic melting,super alloy 7045 MSRR, is shown, [1,4]. This pattern determining surface tension is used for metallic melting maintained at high temperatures. - 1.1: proper melting of super alloy small pieces; 1.2:determination of solid-liquid biphasic domain, bteemtwpeereantuTreS )(;softening temperature) and TL
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