DOI: 10.52150/2522-9117-2019-33-173-192
Prikhodko Igor Yurievich, Dr. Sci. (Engin.), Senior Research Scientist, Head of Department, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: isi@ukr.net, pryhodko@mail.ru ORCID 0000-0001-5651- 8106
Dedik Maxim Alexandrovich, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: demax@bk.ru, ORSID 0000-0001-8585-896X,Stefan Brandt, Sweden, consultant;
Gogaev Kazbek Aleksandrovich, Corresponding Member NASU, Doctor of Technical Sciences, Head. department, Institute of Problems of Materials Science named after I.N. Frantsevich, 03680, Kiev, st. Academician Krzhizhanovsky, 3, email: gogaev@ipms.kiev.ua, ORCID 0000-0002-0304-2535
Itsenko Alexander Ivanovich, Ph.D., senior researcher, Institute of Problems of Materials Science named after I.N. Frantsevich, 03680, Kiev, st. Academician Krzhizhanovsky, 3
Voropaev Vladimir Sergeevich, PhD (Engin.), Senior Researcher, Institute for Problems of Materials Science. I.N. Frantsevich, 03680, Kiev, st. Academician Krzhizhanovsky, 3, ORCID 0000-0001-7408-5957
Comprehensive finite-element study of processes for the production of titanium strips by asymmetric cold rolling of a powder followed by sintering
Summary. Finite-element numerical modeling was implemented and a study of the production processes of thin titanium strips was carried out on the basis of two key sequential processes: asymmetric powder rolling and sintering of the rolled product using the Brand-Nielson model. The results of studying the processes of compaction and sintering of titanium powder using a single mathematical model proposed by Jan Brandt are presented. For the calculations we used experimentally determined shear stresses and volumetric compression modulus under hydrostatic compression and uniaxial compression. The friction conditions between the surfaces of the rolls and the powder were determined as a function of the change in the Coulomb coefficient of friction on the relative sliding speed of the surfaces of the roll and the workpiece. An analysis of the results allows a quantitative assessment of the influence of the technology parameters of the compaction and sintering processes on the change in the stress state and relative density in the volume of products at the stages of production processes. It is shown that the application of the von Mises density and stress diagrams for the correction of the sintering regime allows avoiding the appearance of defects (insufficiently uniform density of the sintered material and the presence of microcracks) during intense heating of the metal in the furnace. The development of sintering modes based on the Brand-Nielson model simplifies the improvement of technology in the sintering of bulk bodies, which is a more timeconsuming process than sintering of thin plates. This model can be used in the development of sintering regimes for various materials since it takes into account the influence of basic phenomena in this process. By varying the technology parameters it is possible to achieve targeted effects on product quality indicators and prevent the formation of microcracks in them.
Key words: asymmetric powder rolling, sintering, titanium.
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