Problem pęknięć na gorąco odlewów staliwnych opisano funkcją typu „S” stosując próbkę technologiczną opracowaną przez Althoffa-Radtkego. Przeprowadzone badania procesu metalurgicznego oraz jakości metalurgicznej staliwa i zastosowanie metod statystyki matematycznej pozwoliły na określenie czynników, które w sposób istotny wpływają na pęknięcia na gorąco odlewów staliwnych.
EN
The problem of hot shrinkage's of cast steel iron alloys has been described by function S type, using technological test elaborated by Althoff-Radtke. Investigations conducted on metallurgical process and metallurgical quality of cast steel as well as application of mathematical statistics methods allowed to define factors which highly influenced hot shrinkage's of cast steel alloys.
The paper presents a methodology of modeling relationships between chemical composition and hardenability of structural alloy steels using computational intelligence methods, that are artificial neural network and multiple regression models. Particularly, the researchers used unidirectional multilayer teaching method based on the error backpropagation algorithm and a quasi-newton methods. Based on previously known methodologies, it was found that there is no universal method of modeling hardenability, and it was also noted that there are errors related to the calculation of the curve. The study was performed on large set of experimental data containing required information on about the chemical compositions and corresponding Jominy hardenability curves for over 400 data steel heats with variety of chemical compositions. It is demonstrated that the full practical usefulness of the developed models in the selection of materials for particular applications with intended performance in the area of application.
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