This project deals with various aspects of the multilayer structure during hot package rolling in the multilayer materials with over 1000 layers, as exemplified by a multilayer structure composed of the 30HGSA and 08H18 steels. The subject of analysis was the structural state maps of steels that make up the researched structure. The results of research conducted by means of the micro X-ray spectroscopy and microdiffraction analysis establish the causes of the structural damages in the samples, which are primarily related to the ongoing flattening diffusion of the alloying elements, and serve as the basis for a model of multilayer materials recrystallization, based on a hypothesis postulating that the interlayer boundary is where new dynamic recrystallization grains form. Recommendations are given on performing hot package rolling when producing multilayer materials.
The article presents a study of behaviour of multilayered steel materials in conditions of alternating symmetrical bending when heavy stress is applied at low-cycle fatigue conditions with the use of bending unbending test. The study showed different behaviour pattern when applying stress to two compositions of multilayered steel materials – W108+AISI 304 and W108+AISI 430. The fractographic analysis of fatigue rupture surfaces was used to explain the results obtained in studying the number of cycles prior to fracture, which showed that the mode of failure of the two compositions of multilayered steel materials was different.
The results of a number of studies show that there are ways to drastically change the temperature dependence of the impact strength of structural steels, which at first glance have a paradoxical character. It was established that when the test temperature decreases down to cryogenic temperatures, the work of failure of impact samples cut in certain directions of rolled products does not change, which indicates the absence of a formal viscous-brittle transition threshold and an increase in material reliability at low temperatures. The reason for this phenomenon is the layered structure formed during the hot batch rolling process, due to which complete failure of impact samples with a U-shaped concentrator does not occur.
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