Title of the article

HOT DEFORMATION OF ALLOYS: CHARACTERISTIC STRUCTURAL AND MECHANICAL PROPERTIES AND CONSTITUTIVE EQUATIONS USED FOR MODELING OF THE TECHNOLOGICAL PROCESSES.

Authors

VASIN Rudolf A., D. Sc. in Phys.-Math., Prof., Head of Laboratory, Institute of Mechanics, Lomonosov Moscow State University, Moscow, Russia, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

BYLYA Olga I., Ph. D. in Phys.-Math., Assoc. Prof., Researcher, University of Strathclyde, Glasgow, United Kingdom, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

BLACKWELL Paul L., Ph. D., Engineering Director, University of Strathclyde, Glasgow, United Kingdom, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

CHISTYAKOV Petr V., Ph. D. in Phys.-Math., Assoc. Prof., Researcher, Institute of Mechanics, Lomonosov Moscow State University, Moscow, Russia, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

In the section MATERIALS SCIENCE IN MECHANICAL ENGINEERING
Year 2016 Issue 4 Pages 75-81
Type of article RAR Index UDK 539.3 Index BBK  
Abstract

A brief overview on the hot deformation of alloys applied to the hot working problems is provided. The analysis of the typical stress-strain diagram shows that at high temperature many alloys exhibits softening during active deformation. There is a significant difference between the behaviour of alloys under optimal conditions of superplasticity and under conditions where one or more parameters lie beyond the optimal limits. Herein, we present two approaches to the modelling of microstructure evolution - uncoupled and coupled. In the first case, the boundary-value mechanical problem is solved separately and obtained data is used as the input for the microstructural modelling. In the second case, transformation of the microstructure is directly involved in the constitutive relations via internal variables andthe coupled system of equations. Some approaches to the construction of the coupled models are discussed. The importance of classification of deformation processes on the basis of the thermomechanical loading history is noted.

Keywords

alloy, hot deformation, superplasticity, microstructure, constitutive equations, modeling, workflow

   

You can access full text version of the article

Bibliography
  • Bhattacharya S.S., Bylya O.I., Vasin R.A. Mehanicheskoe povedenie titanovogo splava Ti-6Al-4V c nepodgotovlennoj mikrostrukturoj pri skachkoobraznom izmenenii skorosti deformirovanija v rezhime sverhplastichnosti. [Mechanical behavior of titanium alloy Ti-6Al-4V with unprepared microstructure under jumpwise variations of the strain rate in the superplastic state]. Izv. RAN. MTT [Mechanics of Solids], 2009, vol. 44, no. 6, pp. 951-958.
  • Bhaskaran K., Jha B.B., Mishra B.K., Bylya O.I., Sarandi M.K., Chistyakov P.V., Muravlev A.V., Vasin R.A. Development of a
  • variant of scalar constitutive equations suitable for description of the near super-plastic regimes of deforming. Applied Mechanics
  • and Materials, 2012, no. 110, pp. 163-169.
  • Bylya O.I., Vasin R.A., Chistyakov P.V., Muravlev A.V. Experimental Study of the Mechanical Behavior of Materials under Transient Regimes of Superplastic Deforming. Materials Science Forum, 2013, no. 735, pp. 232-239.
  • Bylya O.I., Vasin R.A., Chistyakov P.V. Ob attestacii nekotoryh variantov teorii sverhplastichnosti po jeksperimentam s nemonotonno izmenjajushhejsja skorost'ju deformacii [On certification of some versions of the theory of superplasticity for experiments with of the strain rate nonmonotonically variable]. Trudy. Mezhdun. konf. “Vosmye Okunevskie chtenija” [Proc. Int.
  • Conference “The Eighth Okunev's Readings”], St. Petersburg, Materials reports, 2013, pp. 91-93.
  • Bylya O.I., Vasin R.A., Pshenichnyuk A.I. Approach for the simulation of the active transformation of the microstructure of two-phase alloys in FEM of the simulation of technological chains in SPF. Materialwissenschaft und Werkstofftechnik, 2014, vol. 45, no. 9, pp. 799-806.
  • Bylya O.I., Pradhan B.K., Yakushina E.B., Blackwell P.L., Vasin R.A. Modelirovanie aktivnoj transformacii mikrostruktury dvuhfaznyh Ti splavov vo vremja gorjachej deformacii [Simulation of active transformation of the microstructure of two-phase Ti alloy during hot deformation]. Pisma o materialah [Letters on materials], 2014, vol. 4, no. 2, pp. 124-129.
  • Bylya O.I., Sarangi M.K., Rohit M., Nayak A., Vasin R.A., Blackwell P.L. Simulation of the material softening during hot metal forming. Archives of Metallurgy and Materials, 2015, vol. 60, no. 3A, pp. 1887-1893.
  • Bylya O.I., Blakwell P.L., Vasin R.A. O vybore opredeljajushhih sootnoshenij dlja chislennogo modelirovanija splavov so slozhnoj reologiej [On the choice of the constituve equations for the numerical simulation of alloys with a complex rheology]. Trudy XI Vserossijskij sezd po fundamentalnym problemam teoreticheskoj i prikladnoj mehaniki [ Proc. XI All-Russian Congress on fundamental issues of Theoretical and Applied Mechanics], Kazan, Izd-vo Kazanskogo (Privolzhskogo) federalnogo universiteta, 2015, pp. 653-655.
  • Bylya O.I., Vasin R.A., Blackwell P.L. The Mechanics of Superplastic Forming - How to Incorporate and Model Superplastic and Superplastic-Like Conditions Superplasticity in Advanced Materials. Proc. Sc Materials Science Forum. 2016, vol. 838-839, pp. 468-476.
  • Vasin R.A., Bylya O.I., Blackwell P.L. O nekotoryh osobennostjah modelirovanija tehnologicheskih processov, ispol’zujushhih sverhplasticheskuju formovku [Some features of simulation of the technological processes using superplastic forming]. Aktualnye voprosy mashinovedenija: cb. nauch. tr. [Topical Issues of Mechanical Engineering: collection of scientific articles], Minsk, 2015, no. 4, pp. 291-295.
  • Kaybyshev O.A. Sverhplastichnost promyshlennyh splavov [Superplasticity of industrial alloys]. Moscow, Metallurgiya, 1984. 264 p.
  • Vasin R.A., Bylya O.I. O razuprochnenii splavov v processe vysokotemperaturnogo deformirovanija [About softening of the alloys during high temperature deformation]. Sb. “Uprugost I neuprugost” [Collection of articles “Elasticity and inelasticity”], Moscow, Izd-vo Moskovskogo un-ta, 2016, pp. 151-157.
  • Chumachenko E.N., Smirnov O.M., Tsepin M.A., Malinetskiy G.G. Sverhplastichnost: materialy, teorii, tehnologii [Superplasticity: materials, theory, technology]. Moscow, KomKniga, 2005. 320 p.
  • Mulyukov R.R., Imaev R.M., Nazarov A.A., Imaeva V.M., Imaeva M.F. Sverhplastichnost ultramelkozernistyh splavov: jeksperiment, teorija, tehnologii [The superplasticity of ultrafine alloys: experiment, theory, technology]. Moscow, Nauka, 2014, 284 p.
  • Smirnov O.M. Obrabotka metallov davleniem v sostojanii sverhplastichnosti [Metal forming in superplasticity state]. Moscow, Mashinostroenie, 1979. 184 p.
  • Kaybyshev O.A., Utyashev F.Z. Sverhplastichnost, izmelchenie struktury i obrabotka trudnodeformiruemyh splavov [Superplasticity, structure refinement and processing of hardto-deform alloys]. Moscow, Nauka, 2002. 440 p.
  • Sommitsch C., Huber D., Fredrik I.S., Mitsche S., Stockinger M., Buchmayr B. Recrystallization and grain growth in the nickel-based superalloy Allvac 718Plus. Int. J. Mater. Res., 2009, vol. 100, no. 8, pp. 1088-1098.
  • Charles Murgau C., Pederson R., Lindgren L.E. A model for Ti-6Al-4V microstructure evolution for arbitrary temperature changes. Modelling Simul. Mater. Sci. Eng., 2012. 23 p.
  • Lin J., Dean T.A. Modelling of microstructure evolution in hot forming using unified constitutive equations. Journal of Materials Processing Technology, 2005, no. 167, pp. 354-362.
  • Rabotnov Yu.N. Mehanika deformiruemogo tverdogo tela [Mechanics of a deformable solid body]. Moscow, Nauka, 1979. 744 p.
  • Ilyushin A.A. O svjazi mezhdu naprjazhenijami i malymi deformacijami v mehanike sploshnyh sred [On the relationship between stress and small deformations in continuum mechanics]. Prikladnaja matematika i mehanika [Applied Mathematics and Mechanics], 1954, vol. 18, no. 6, pp. 641-666.
  • Ilyushin A.A. Plastichnost. Osnovy obshhej matematicheskoj teorii [Plasticity. Fundamentals of general mathematical theory]. Moscow, AN USSR, 1963. 271 p.
  • Ilyushin A.A. Metod SN-JeVM v teorii plastichnosti [SM EVM method in the theory of plasticity]. Sb “Problemy prikladnoj matematiki i mehaniki” [Collection “Problems of Applied Mathematics and Mechanics”], Moscow, Nauka, 1971, pp. 166-178.
  • Mossakovskiy P.A., Vasin R.A., Antonov F.K. Razvitie metoda SNJeVM Il’jushina primenitel'no k kraevym zadacham dinamicheskoj prochnosti [Ilyushin SM EVM method development applied to boundary value problems of dynamic strength]. Materialy Mezhdun. nauchn. simp. po problemam mehaniki deformiruemyh tel, posvjashh. 100-letiju so dnja rozhdenija A.A. Ilyushina “Uprugost I neuprugost” [Proc. Int. scientific symposium on problems of the mechanics of deformable bodies dedicated to the 100th anniversary of A.A. Ilyushin “Elasticity and inelasticity”].
  • Ermachenko A.G., Vasin R.A., Enikeev F.U. Ob ispolzovanii banka dannyh o strukturno-mehanicheskih svojstvah materialov pri proektirovanii progressivnyh tehnologicheskih processov poluchenija izdelij povyshennoj nadjozhnosti [On the use of data bank on the structural and mechanical materials properties in design of progressive technological processes of manufacturing of high reliability products]. Matem. Modelir. Sistem i processov [Mathematical Modeling of Systems and Processes ], 2001, no. 9, pp. 20-32.
  • Vasin R.A. Teorija uprugoplasticheskih processov i issledovanie strukturno-mehanicheskih svojstv materialov [The theory of elastoplastic processes and study of structure-mechanical properties of materials]. Izv. RAN. Mehanika tverdogo tela [Mechanics of Solids], 2011, no. 1, pp. 15-20.
  • Sui Feng-Li, Xu Li-Xia, Chen Li-Qing, Liu Xiang-Hua. Processing map for hot working of Inconel 718 alloy. J. of materials processing technology, 2011, no. 211, pp. 433-440.