Structural Heredity of Cast Iron in Bimetallic Products

Properties of cast iron on the bimetallic part depend on the initial structural state of the cladded cast iron and technological parameters of its induction cladding process. Methodology of predicting the properties of the cast iron in the bimetallic valve tappets ICE largest hardness billets was used for cladding, the silicon content in the alloy cladding and the technological parameters of the process, as well. A hereditary relationship between the initial state of the cast iron of the semi-finished product, used for induction cladding, and the structural state of the layer of weld on the steel base of the part, has been established.

Detection of Intermediate Phases in Metal Alloys

In addition to property anomalies, a distinguishing feature of the intermediate phase is the qualitative change of the crystallization or recrystallization interval (Q∆LS) that occurs at congruent and incongruent melting phases, at eutectic or eutectoid points, at the ends of eutectic or eutectoid horizontals, and also at any nonmonotonicity of the liquidus, since the solidus or solidoid is a horizontal in eutectic or eutectoid systems. A technique has been developed that allows us to associate anomalies in the properties of industrial alloys with state diagrams based on the first established criterion - a qualitative change (length in temperature) of the crystallization (recrystallization) interval (Q∆LS), as well as with a difference in the structural heredity (genealogy) of the component atoms that make up dual system. A joint analysis of the anomalies in the properties of binary alloys with state diagrams (based on the established criterion (Q∆LS)) allows us to relate the latter to the presence of intermediate phases in Al − Si, Fe − C, Al − Cu systems. The intermediate phases AnBm-Q∆LS explaining the anomalies of properties are declared: ~Al7Si, Al41Cu9 − correspond to the eutectic point; Fe24C − eutectoid point; Al11Si, AlSi6 − the bend of the liquidus; Fe42C − bending liquidoid; Al49Cu, Al98.5Si1.5 − the end of the eutectic horizontal; Cu4Al, Cu7Al3 − to the ends of the eutectoid horizontal.

The «fluid memory» effect in steel, cast iron and silumin

Явление структурной наследственности получило промышленное применение, несмотря на то что «механизм передачи наследственных признаков расплаву, их сохранение, зарождение в нем новых признаков и передача их твердому металлу - все это сложные, во многом неизученные вопросы» (Б.А. Баум с коллегами). На примерах стали, чугуна и алюминия предпринята попытка обоснования предположения, что одним из механизмов передачи наследственных признаков может быть эффект «памяти жидкости», который заключается в сохранении ее свойств при очень сильном разбавлении. The phenomenon of structural heredity is used by industry, although «the mechanism of transmission of hereditary traits to the melt, their conservation, the generation of new traits in it and their transfer to solid metal are all complex, largely unexplored issues» (B.A. Baum with colleagues). On the examples of steel, cast iron and aluminum, an attempt was made to substantiate the assumption that one of the mechanisms of transmission of hereditary traits could be the effect of «fluid memory», which consists in maintaining its properties with very strong dilution.