Parameter optimisation in constitutive equations for hot forging

Mulyadi, Musrady; Rist, M. A.; Edwards, L.; Brooks, Jeffery

doi:10.1016/j.jmatprotec.2006.04.058

Cited by 36 publications

(14 citation statements)

References 4 publications

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“…The available studies are based on experimental data which is often very limited. In general a minimum number of tests are done in order to identify the chosen constitutive model without comparing its domain of validity with the loads applied to the material during machining [5] or forging [6].…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

Hor

Morel

Lebrun

et al. 2013

International Journal of Mechanical Sciences

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. During forging and machining manufacturing processes, the material is subject to large strains at high strain rates which provoke local heating and microstructural changes. Modelling of these phenomena requires precise knowledge of the stress-strain constitutive equations for a large range of strains, strain rates and temperatures. An experimental study of the rheology of both hyper-and hypo-eutectoid steels (with different microstructures) over a temperature range from 20 1C to 1000 1C and with strain rates from 10 À2 to 10 5 s À1 has been undertaken. These tests were performed in compression on cylindrical specimens and in shear using hat-shaped specimens. Both a GLEEBLE 3500 thermomechanical testing machine and a Split-Hopkinson Pressure Bar apparatus were used. From these tests, three deformation domains have been identified as a function of the material behaviour and of the changes in the deformed microstructure. Each domain was characterized by its behaviour, including the competition between hardening and softening, strain rate sensitivity on the flow stress and the softening phenomenon (i.e. recrystallisation or recovery, etc.). Finally, based on thermodynamical considerations, the conditions of thermoplastic instability (i.e. shear bands, twinning, heterogeneities, etc.) and microstructural changes are highlighted using process maps of the dissipated power repartition.

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Section: Introductionmentioning

confidence: 99%

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

Hor

Morel

Lebrun

et al. 2013

International Journal of Mechanical Sciences

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show abstract

“…The Avrami equation is used to describe the relationship between DRX volume fraction and the effective strain: (8) in which denotes the strain for 50% recrystallization:…”

Section: Dynamic Recrystallization (Drx)mentioning

confidence: 99%

“…Hence, by controlling the thermomechanical state of the deformation zone in the forging process it will be possible to substantially influence the mechanical and service properties of the products [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis Of Deformation And Microstructural Evolution In The Hot Forgingof The Ti-6Al-4V Alloy

Kukuryk¹

2015

Archives of Metallurgy and Materials

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“…The determination of temperature distribution within the deformation zone during the titanium alloy forging process is important because of the effect of temperature on the properties and structure of the material being deformed [6,7]. Hence, by controlling the thermomechanical state of the deformation zone in the forging process it will be possible to substantially influence the mechanical and service properties of the products [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis Of Deformation And Microstructural Evolution In The Hot Forging Of The Ti-6Al-4V Alloy

Kukuryk¹

2015

Archives of Metallurgy and Materials

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The paper presents the analysis of the three-dimensional strain state for the cogging process of the Ti-6Al-4V alloy using the finite element method, assuming the rigid-plastic model of the deformed body. It reports the results of simulation studies on the metal flow pattern and thermal phenomena occurring in the hot cogging process conducted on three tool types. The computation results enable the determination of the distribution of effective strain, effective stress, mean stress and temperature within the volume of the blank. This solution has been complemented by adding the model of microstructure evolution during the cogging process. The numerical analysis was made using the DEFORM-3D consisting of a mechanical, a thermal and a microstructural parts. The comparison of the theoretical study and experimental test results indicates a potential for the developed model to be employed for predicting deformations and microstructure parameters.Keywords: hot forging, titanium alloy, finite element method, microstructure evolution W pracy przedstawiono analizę przestrzennego stanu odkształcenia dla procesu kucia wydłużającego stopu tytanu Ti-6Al-4V z wykorzystaniem metody elementów skończonych z założeniem sztywnoplastycznego modelu odkształcanego ciała. Przedstawiono wyniki prac związanych z symulacją schematu płynięcia metalu i zjawisk cieplnych w procesie kucia na gorąco w trzech rodzajach narzędzi kuźniczych. Rezultaty obliczeń umożliwiają określenie rozkładu intensywności odkształcenia, intensywności naprężeń, naprężeń średnich i temperatury w objętości odkuwki. Rozwiązanie uzupełniono o model rozwoju mikrostruktury podczas kucia. Analizę numeryczną wykonano z wykorzystaniem programu DEFORM-3D, składającego się z części mechanicznej, termicznej i mikrostrukturalnej. Porównanie teoretycznych i eksperymentalnych rezultatów badań wskazuje na możliwość zastosowania opracowanego modelu do prognozowania odkształceń i parametrów mikrostruktury.

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Parameter optimisation in constitutive equations for hot forging

Cited by 36 publications

References 4 publications

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

An experimental investigation of the behaviour of steels over large temperature and strain rate ranges

Analysis Of Deformation And Microstructural Evolution In The Hot Forgingof The Ti-6Al-4V Alloy

Analysis Of Deformation And Microstructural Evolution In The Hot Forging Of The Ti-6Al-4V Alloy

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