Numerical and Experimental Analysis of Wire Drawing for Hardly Deformable Biocompatible Magnesium Alloys / Numeryczna I Doswiadczalna Analiza Ciagnienia Drutu Z Trudno Odkształcalnych Biozgodnych Stopów Magnezu

Milenin, A.; Kustra, Piotr

doi:10.2478/v10172-012-0150-0

Cited by 18 publications

(20 citation statements)

References 1 publication

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“…FE simulation can also be used to predict fracture occurrence during processing of magnesium alloys, this approach was successfully applied for sheet metal forming [18] and wire drawing [8,19]. In [8], the material formability utilization criterion was used to determine optimal drawing parameters, similar approach was also presented in [20].…”

Section: Introductionmentioning

confidence: 99%

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Computer Aided Design of Wires Extrusion from Biocompatible Mg-Ca Magnesium Alloy

Milenin¹,

Gzyl²,

Rec³

et al. 2014

Archives of Metallurgy and Materials

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Mathematical model of small-diameter wires extrusion from biocompatible MgCa08 (Mg -0.8% Ca) magnesium alloy was developed in the current paper in order to determine window of allowable technological parameters. Compression and tensile tests were carried out within temperature range 250-400• C and with different strain rates to determine the fracture conditions for the studied alloy. Finite element (FE) analysis was used to predict the billet temperature evolution and material damage during processing. The extrusion model takes into account two independent fracture mechanisms: a) surface cracking due to exceeding of the incipient melting temperature and b) utilization of material formability. FE simulations with different initial billet temperatures and pressing speeds were performed in order to determine the extrusion limit diagram (ELD) for MgCa08 magnesium alloy. The developed ELD was used to select the parameters for the direct extrusion of wires with diameter of 1 mm. Then, the extrusion of twelve wires was conducted at 400• C with pressing speed 0.25 mm/s. It was reported that the obtained wires were free from defects, which confirmed the good agreement between numerical and experimental results.Keywords: magnesium alloys, extrusion, ductile fracture, FE analysis W pracy zaproponowano model matematyczny procesu wyciskania prętów o małych średnicach z biokompatybilnego stopu magnezu MgCa08 (Mg -0.8% Ca). Na podstawie opracowanego modelu możliwy jest dobór parametrów technologicznych rozpatrywanego procesu. Model procesu wyciskania zawiera model do prognozowania utraty spójności materiału, który został opracowany w oparciu o próby spęczania oraz jednoosiowego rozciągania w zakresie temperatur 250-400• C dla różnych pręd-kości odkształcenia. W oparciu o metodę elementów skończonych (MES) przeprowadzona została analiza numeryczna rozkładu temperatury oraz wskaźnika wykorzystania odkształcalności materiału w procesie wyciskania. Zaproponowany model zawiera dwa możliwe mechanizmy utraty spójności: a) wynikający z lokalnego przekroczenia temperatury topnienia, b) wynikający z wyczerpania zapasu plastyczności. W oparciu o przeprowadzoną analizę MES procesu wyciskania dla różnych temperatur oraz prędkości wyciskania opracowano diagram ELM (extrusion limit diagram) dla stopu MgCa08. Na podstawie opracowanego diagramu ELM dobrano parametry procesu wyciskania prętów o średnicy 1 mm. Weryfikację modelu procesu wyciskania dla stopu MgCa08 wykonano w warunkach laboratoryjnych, gdzie przeprowadzono dwunasto żyłowy proces wyciskania prętów w temperaturze 400• C i prędkości 0.25 mm/s. Otrzymane pręty były wolne od wad, co potwierdziło dobrą zgodność pomiędzy wynikami numerycznymi i eksperymentalnymi.

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Section: Introductionmentioning

confidence: 99%

“…In [8], the material formability utilization criterion was used to determine optimal drawing parameters, similar approach was also presented in [20]. Multi scale method was proposed for modelling fracture during cold wire drawing [19].…”

Section: Introductionmentioning

confidence: 99%

Computer Aided Design of Wires Extrusion from Biocompatible Mg-Ca Magnesium Alloy

Milenin¹,

Gzyl²,

Rec³

et al. 2014

Archives of Metallurgy and Materials

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“…Then, positive feedback switch on and wire is broken. An example of such a fracture mechanism is described in [5].…”

Section: Dislocation Density and Flow Stress Modelmentioning

confidence: 99%

“…The magnesium alloys occupy medium place. Studies of annealing process [5] for Az31 show the recrystallization temperature depends on strain and varies 190ºC to 140ºC when strain change from 0.1 to 0.3. For the same strains, temperature, when grains begin to grow, is 230 to 160ºC.…”

Section: Relaxation Modelmentioning

confidence: 99%

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Modeling with FCA-Based Model of Microstructure Evolution of MgCa08 Alloy During Drawing of Thin Wire in Heated Die / Modelowanie Za Pomocą FCA Rozwoju Mikrostruktury Stopu MgCa08 Podczas Ciągnienia Cienkiego Drutu W Podgrzewanym Ciagadle

Svyetlichnyy¹,

Kustra²,

Milenin³

2015

Archives of Metallurgy and Materials

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The paper deals with a modeling of manufacturing process of thin wire of MgCa08 alloy used as biocompatible soluble threads for medical application. Some difficulties in material deformation subjected with its hexagonal structure can be solved with accurate establishment of the deformation conditions, especially temperature history of the whole process. In drawing process with heated die, wire is preheated in furnace and then deformed. The only narrow temperature range allows for multi-pass drawing without wire breaking. Diameter below 0.1 mm required for the final product makes very important the consideration of microstructure evolution because grain size is comparable with the wire dimensions. For this reason the problem is considered in the micro scale by using the frontal cellular automata (FCA)-based model. The goals of present work are the development and validation of FCA-base model of microstructure evolution of MgCa0.8 magnesium alloy. To reach this objective, plastometric and relaxation tests of MgCA08 alloy were done on physical simulator GLEEBLE 3800. Results of the experimental studies were used for parameters identification of the hardening-softening model of the material. Then, initial microstructure and its evolution during the drawing passes were simulated with FCA-based model. FCA consider dislocation density and flow stress, hardening and softening including recovery and recrystallization, grain refinement and grain rotation, as well as grain growth. It allows one to obtain structures close to real ones. Two variants of the drawing process with different temperature history were considered. The deformation scheme was the same. Simulation results with following short discussion confirm usefulness of FCA-based model for explanation and selection of rational technological condition of thin wire drawing of MgCa08 alloy.

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Fatigue and Corrosion Fatigue of Cold Drawn WE43 Wires

Griebel¹,

Schaffer²

2015

Magnesium Technology 2015

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Numerical and Experimental Analysis of Wire Drawing for Hardly Deformable Biocompatible Magnesium Alloys / Numeryczna I Doswiadczalna Analiza Ciagnienia Drutu Z Trudno Odkształcalnych Biozgodnych Stopów Magnezu

Cited by 18 publications

References 1 publication

Computer Aided Design of Wires Extrusion from Biocompatible Mg-Ca Magnesium Alloy

Computer Aided Design of Wires Extrusion from Biocompatible Mg-Ca Magnesium Alloy

Modeling with FCA-Based Model of Microstructure Evolution of MgCa08 Alloy During Drawing of Thin Wire in Heated Die / Modelowanie Za Pomocą FCA Rozwoju Mikrostruktury Stopu MgCa08 Podczas Ciągnienia Cienkiego Drutu W Podgrzewanym Ciagadle

Fatigue and Corrosion Fatigue of Cold Drawn WE43 Wires

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