Analysis of Rheological Properties of Steel near Solidus Point Using Gleeble® Simulator

2008 ◽  
Vol 141-143 ◽  
pp. 325-330
Author(s):  
Krzysztof P. Sołek ◽  
Zbigniew Mitura ◽  
Mirosław Karbowniczek ◽  
Plato Kapranos ◽  
Roman Kuziak ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Solid State ◽  
Liquid Phase ◽  
Rheological Properties ◽  
Wide Temperature Range ◽  
Steel Alloy ◽  
Phase Content ◽  
Globular Microstructure ◽  
Die Filling ◽  
Semi Solid

The main goal of this work is the analysis of rheological properties of steel alloy at high temperatures, just below the solidus point, and in the semi-solid state with low liquid phase content. Data obtained from the analysis can form the basis of numerical simulation for designing and optimizing the thixoforming processes. The rheological properties should be known over a wide temperature range so that the simulations could also predict defects such as incomplete die filling. The analysis concerned M2 tool steel alloy. The paper also discusses development of globular microstructure in partially melted steel.

Investigation of Microstructure and Mechanical Properties of Semi-Solid State Joining of SSM Aluminum Alloys

2014 ◽  
Vol 496-500 ◽  
pp. 371-375 ◽  
Author(s):  
Apirit Petkhwan ◽  
Prapas Muangjunburee ◽  
Jessada Wannasin
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Weld Metal ◽  
Butt Joint ◽  
A356 Aluminum Alloy ◽  
Globular Microstructure ◽  
Microstructure And Mechanical Properties ◽  
A356 Aluminum ◽  
Semi Solid ◽  
Solid State Joining

In this research, the semi-solid state joining of SSM A356 aluminum alloy was investigated. The butt-joint of SSM A356 was heated by an induction heating coil to create a localized semisolid pool. Then a stirrer was applied into the joint seam in order to mix the weld metal. The accurate controlling of temperature during joining was measured. The effects of stirring rate on physical, macrostructure, microstructure and mechanical properties were studied. Experimental results showed that increase in stirring rates, the surface of the joint was smooth. The weld metal consisted of the globular microstructure and also voids. The density of weld metal zone increased by an appropriate stirring. The best tensile strength was achieved with 1750 rpm, 70 mm/min for 103.4 MPa.

Rheological Properties and Microstructure of Hypereutectic Semi-Solid Al-Si-Mg Alloys Using Rheocasting Route

2012 ◽  
Vol 192-193 ◽  
pp. 323-328 ◽  
Author(s):  
Mehand Tebib ◽  
Frank Ajersch ◽  
X. Grant Chen
Keyword(s):  
Solid State ◽  
Rheological Properties ◽  
Parallel Plate ◽  
Fluid Model ◽  
Flow Behavior ◽  
Microstructural Study ◽  
Shear Rates ◽  
Solid Phases ◽  
Semi Solid ◽  
Liquid And Solid Phases

The SEED rheocasting process was used to produce semi-solid slurries of hypereutectic Al-17Si-4.5Cu (A390) and Al-15Si-10.5Mg-4Cu alloys respectively. The rheological properties of these alloys in the semi-solid state were characterized at different deformation rates and at variable solid fractions using the parallel plate compression viscometry. The viscosity at different shear rates was calculated using a Newtonian fluid model for increments of deformation during compression. Microstructures of both alloys, after partial solidification and compression, were examined in order to characterize the flow behavior during deformation. The comparison of the viscosity between the A390 and Al-15Si-10.5Mg-4Cu alloys indicated that the high Mg containing alloy possessed a higher viscosity for the range of shear rates and solid fractions investigated. Rheological results showed that at a given solid fraction, the viscosity of both alloys decreased significantly with increasing shear rates, indicating a shear thinning behavior. In addition, a separation of liquid and solid phases was also observed for both alloys in the microstructural study of compressed semi-solid billets.

scholarly journals Influence of Experimental Parameters on Properties and Microstructure of the Steel X210CrW12 in the Semi-Solid State

2006 ◽  
Vol 116-117 ◽  
pp. 209-212 ◽  
Author(s):  
Celine Fraipont ◽  
Wolfgang Püttgen ◽  
Wolfgang Bleck ◽  
Jacqueline Lecomte-Beckers
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Steel Grade ◽  
Fine Tuning ◽  
Homogeneous Distribution ◽  
Compression Tests ◽  
Material Behaviour ◽  
Optimal Process ◽  
Experimental Parameters ◽  
Semi Solid

This paper deals with the examination of the steel grade X210CrW12 and its suitability for Thixoforming. In the semi-solid state, the microstructure of this steel consists of a homogeneous distribution of globular particles surrounded by liquid. Additionally, carbides are stabile up to fraction liquid contents of approximately 40%. After quenching, this steel reveals a globular austenitic microstructure with eutectic (former liquid phase) at the grain boundaries. Compression tests permit to determine the influence of different process parameters on the properties and the material behaviour in the semi-solid state. Their influence on the microstructure was investigated but not yet highlighted. Further investigations on this steel allow a fine-tuning to establish optimal process windows of the different thixoforming- and rheoforming- routes.

scholarly journals Rheology of StelliteTM 21 Alloy in Semi-Solid State

2016 ◽  
Vol 61 (4) ◽  
pp. 1901-1908 ◽  
Author(s):  
K. Sołek ◽  
P. Kapranos
Keyword(s):  
Solid State ◽  
Rheological Properties ◽  
Experimental Work ◽  
High Hardness ◽  
Measurement Methods ◽  
Viscosity Models ◽  
High Temperature Furnace ◽  
Secondary Objective ◽  
Semi Solid ◽  
Temperature Furnace

Abstract The main objective of this study was to conduct an analysis of the rheological properties of StelliteTM 21 alloy in the semi-solid state, as the results could be used for identifying the appropriate temperature range for thixoforming of this alloy, and a secondary objective of the experimental work was the development of mathematical model of the alloy’s apparent viscosity. Such viscosity models are necessary for numerical simulations of the thixoforming processes. The StelliteTM 21 alloy exhibits high hardness and thus shaping in the semi-solid state is promising route of production of parts from this alloy. Within the confines of experimental work the measurement methods of the rheological properties at high temperatures was developed. They are based on the use of specially designed viscometer equipped with high temperature furnace.

Enhancement of Gleditsia sinensis gum rheological properties with pressure cell treatment in semi-solid state

2016 ◽  
Vol 84 ◽  
pp. 254-260
Author(s):  
Zi-yuan Zhou ◽  
Wei-an Zhang ◽  
Jiu-fang Duan ◽  
Wei-ming Zhang ◽  
Da-feng Sun ◽  
...  
Keyword(s):  
Solid State ◽  
Rheological Properties ◽  
Pressure Cell ◽  
Gleditsia Sinensis ◽  
Semi Solid

Rheological Investigation of Semisolid AlSi7 Alloy by Means of Oscillation Experiments

2019 ◽  
Vol 285 ◽  
pp. 385-390
Author(s):  
Marialaura Tocci ◽  
Annalisa Pola ◽  
Michael Modigell
Keyword(s):  
Solid State ◽  
Aluminum Alloys ◽  
Mechanical Analysis ◽  
Constant Condition ◽  
Material Models ◽  
Die Filling ◽  
Semisolid Alloys ◽  
Semi Solid ◽  
Frequency Sweeps ◽  
Filling Simulation

Dynamic Mechanical Analysis (DMA) of semisolid aluminum alloys was performed in a rheometer of Searle type. DMA was applied on a binary AlSi7 alloy to demonstrate the advantages of the method for the investigation of the behavior of alloys in semi-solid state and it was compared to classical shear experiments. Frequency sweeps, amplitude sweeps as well as constant condition experiments (CCE) were performed. It became obvious that elastic properties are getting more dominant with increasing resting time without shearing. The shift from a more viscous to more elastic nature of the material can be quantified. Interestingly, it was found that the semi-empirically based Cox-Merz rule, usually applied for polymers, holds for the semisolid material as well. This allows investigating the shear viscosity under different relevant conditions - important to improve material models for die-filling simulation of semisolid alloys.

Simulation of Thixocasting Processes in Automotive Component

2005 ◽  
Vol 480-481 ◽  
pp. 361-366
Author(s):  
Antonio Forn ◽  
Sergi Menargues ◽  
Enric Martín ◽  
G.L. Chiarmetta
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Structural Parameter ◽  
Homogeneous Material ◽  
Simulation Tools ◽  
Die Filling ◽  
Real Process ◽  
Solidification Processes ◽  
Semi Solid ◽  
Filling And Solidification

Thixocasting or semi-solid casting is an alternative to the traditional casting processes. A numerical simulation of these methods is useful to define the real process. A new test concept will be presented to determine parameters, such as temperature and rates, as well as the die filling and solidification processes. The simulation tools permit us to understand better the processes, to predict and to eliminate potential defects before they take place. The studied component is a steering knuckle made of an A357 aluminium alloy. The microstructure is characterized by optical microscopy. It has been preceded to the development of a model based on the experimental data, it has been defined to the semi-solid as an homogeneous material with thixotropic properties, and the microstructure is a structural parameter. The results are compared with real tests.

Numerical Simulation of Semi-Solid Die Casting Process of Magnesium Alloy

2011 ◽  
Vol 474-476 ◽  
pp. 255-259 ◽  
Author(s):  
Ya Ping Hu ◽  
Yong Hu
Keyword(s):  
Numerical Simulation ◽  
Die Casting ◽  
Flow Characteristics ◽  
Casting Process ◽  
Die Design ◽  
Filling Process ◽  
Die Filling ◽  
Gas Cavity ◽  
Die Casting Process ◽  
Semi Solid

Numerical simulation can be used to predict die filling, and hence to optimize the die design. In the study, the flow characteristics of liquid filling comparing with those of semi-solid filling were analyzed. The results indicated that the liquid filling turned out to be turbulent, while the semi-sold filling had laminar flow characteristics which could reduce the foundry defects such as gas cavity and oxidation mixture. The distribution of pressure reduced gradually in the filling direction during semi-solid filling process which would generate back pressure that was favorable for filling process.

scholarly journals Rheological Analysis of Semi-Solid A380.0 Aluminium Alloy / Analiza Właściwości Reologicznych Stopu Aluminium A380.0 W Stanie Stało-Ciekłym

2015 ◽  
Vol 60 (4) ◽  
pp. 2613-2618 ◽  
Author(s):  
K. Solek ◽  
S. Szczepanik
Keyword(s):  
Numerical Modeling ◽  
Solid State ◽  
Aluminium Alloy ◽  
Rheological Properties ◽  
Experimental Work ◽  
Liquid Aluminium ◽  
Rheological Analysis ◽  
Significant Achievement ◽  
Semi Solid ◽  
Material Tests

Knowledge of the rheological properties is crucial for the numerical modeling of technological processes. The main objective of this study was to conduct an analysis of the rheological properties of A380.0 (AlSi9Cu3(Fe)) aluminium alloy in the semi-solid state. The results could be used for identification of temperature range of the alloy, where thixoforming processes could be executed. Another purpose of the experimental work could be development of the mathematical models of the alloy apparent viscosity. The significant achievement of this particular study is an application of a viscometer which was specially designed for material tests executed at high temperatures, such as the measurement of liquid or semi-liquid aluminium viscosity. This paper presents the results of a rheological analysis of aluminium alloy.

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