The paper demonstrates the capability of the developed phase transformation model to design the cooling conditions in the Stelmor process allowing for obtaining different types of microstructures in wire rod of 32CrB4 steel. The model based on modified JMAK equation was developed using the results of the tests conducted in a DIL 805 A/D/T dilatometer. The model is composed of sub-models of ferritic, pearlitic, bainitic and martensitic transformations. Its predictive capability was confirmed in industrial conditions by performing trials with different settings of fans involved in the cooling process on the Stelmor line of CMC Poland. Excellent performance of the model was achieved through the modification of commonly used equations which allows accurate predictions of the phase transformations start and finish temperatures, as well as volume fraction of microstructural constituents, in a wide range of cooling rates. It was demonstrated that the model can effectively be applied to design the cooling conditions in the Stelmor process, which will result in the required microstructural composition of the wire rod.

The phase transformation model is the subject of this article capable of evaluating the hardenability of various bainitic steels. The objective is to provide a tool, which will help to design the chemical composition of steels with enhanced bainitic hardenability. Three general indexes, which are based on the relation between bainite volume fraction and cooling rate, and which characterize the hardenability, are proposed. Calculations of these hardenability indexes are presented for low-carbon steels with different chemical compositions. Correlation between the chemistry and the hardenability factors is evaluated. Following this, an industrial process of cooling of wire rods is simulated for the steel with hardenability indexes adjusted to the cooling capabilities of Stelmor system. The cooling conditions, which give a favorable multiphase microstructure of wire rod for cold heading applications, are designed.

Celem pracy jest zidentyfikowanie różnic w aktywności obiektów Szlaku Zabytków Techniki w mediach społecznościowych w czasie pandemii. Analizie poddano media społecznościowe wybranych obiektów ze szlaku, zgrupowane według 3 kategorii: browar, kopalnia oraz muzeum. Analiza wykazała, że obiekty ze sobą współpracowały, przeprowadzały dużo akcji promujących swoje ekspozycje oraz wychodziły z aktywizującymi inicjatywami. Podstawę badań stanowiła krytyczna analiza literatury przedmiotu oraz studium przypadku – Szlaku Zabytków Techniki.

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