Experimental Researches of Carbon Steels Plasticity Changes in the Field of Phase Transformations
Year: 2019
Type: conference-paper
Abstract: Results of experimental researches of carbon steels plasticity changes in steel grades 10, 35 and U8A, depending on deformation temperature are provided to vicinities of critical points Ac 1 and Ac 3 . Change of plasticity in the studied materials analyzed on values of an aspect ratio and strength. It is revealed that the aspect ratio of these steels as the characteristic of plasticity raises with increase in temperature, reaches a maximum, higher than temperature of critical point decreases and increases with the subsequent increase of temperature. In steels with small carbon content the main contribution to increase in plasticity is made by a condition of pretransformation near a point of phase transition Ac 3 . In eutectoid steel grade U8A the main increase of plasticity is provided with a condition of pretransformation near eutectoid phase transition in a point Ac 1. In steel grade 35 on curve dependence of plasticity on temperature two extremum corresponding to a condition of pretransformation before points Ac 1 and Ac 3 are observed. It is established that in all three steel grades of the studied carbon steels in a condition of pretransformation plasticity is higher, than in an austenitic state. The revealed patterns and the received mathematical dependences describing changes of plasticity at phase transformations of carbon steels give the chance of practical application of the found plasticity resource when processing by pressure of different classes of steels. Processing in this case can be made at lower temperatures and forces of deformation that will allow reducing risk of emergence of scale, to increase processing productivity. The received results can be used when developing power- and resource-saving technologies of processing by pressure of carbon steels.
Authors: O V Kuzovleva, V V Preis, N E Proskuriakov
Institution: Tula State University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2943117136