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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Defects and Properties of Cast Metals
Presentation Title Numerical Predictions of Local Residual Stresses around Individual Graphite Nodules in Ductile Iron and Experimental Validation
Author(s) Tito Andriollo, Niels Skat Tiedje, Jesper Thorborg, Jesper Hattel
On-Site Speaker (Planned) Tito Andriollo
Abstract Scope Residual stresses in ferritic ductile iron castings have been studied for decades. However, very little attention has traditionally been given to the local residual stresses which may arise in the microstructure as a result of the thermal expansion mismatch between the matrix and the graphite nodules during solid-state cooling. Recently the authors proposed a new model for calculating local residual stresses in ductile cast irons, and showed that they may be 100-150 MPa, hence of the same order of magnitude as the material macroscopic yield stress. These preliminary analyses neglected the influence of important factors such as time-dependent inelastic deformation in the ferrite. In this work, more accurate numerical estimates are proposed on the basis of a detailed experimental characterization of the thermo-mechanical behavior of the matrix at different temperatures. The results are then compared with residual stress measurements from differential aperture synchrotron X-ray microscopy.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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A Modeling and Experimental Investigation on the Formation of Acicular Silicon and Sludge in High Pressure Die Casting of a Modified A383 Alloy
Assessment of the Impact of Water-Cooled Chill Technology on Microstructure Length-Scales in an A319 Engine Block Casting
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Determining Eutectic Grain Size and Casting Defects in an Al-12Si-0.8Cu-0.5Fe-0.9Mg-0.7Ni-0.2Zn Alloy
Effect of Continuous Casting Processing Parameters on the Hot Ductility of Micro-alloyed Steels
Effect of Molybdenum Content, Pouring Temperature and Cooling Rate on the Casting Defects of High Chromium White Cast Iron
Effect of Segregated Alloying Elements on the High Strength Steel Properties: Application to the Large Size Ingot Casting Simulation
Effect of Solidification Conditions on the Formation of Sludge in High Pressure Die Casting of Aluminum Alloy AA383
Effect of Various Aluminum Content on the Formation of Inclusion
Evaluation of Hot Cracking Sensitivity Using Multiphase Field and FE Methods during Continuous Casting of Nb Microalloyed Gear Steels
Hot-tearing of Multicomponent Al-Cu Alloys Based on Casting Load Measurements in a Constrained Permanent Mold
In-situ Observation of Spheroidal Graphite Formation and Measurement of Apparent Volume Expansion in Ductile Cast Iron
In-situ Synchrotron X-ray Imaging of Inter-dendritic Fluid Flow Using a Model Al-Pb Alloy
Influence of Fe-rich Intermetallics on the Formation of Solidification Defects
Influence of Geometry and Aluminum Content on the Microstructure and Tensile Behavior of HPDC Mg AM Series Alloys
Investigation of Hot Tearing A380.1 In “T Shape Mold”
L-36: Effect of the Addition of Ce and Si on the Hot Cracking Behavior of SiMn Alloy during the Solidification Process
L-37: Improved Wear Resistance of Hadfield Steel Through the Addition of Nb Containing Carbides
L-39: Influence of Different Cooling Microstructure on Surface Cracks of HSLA Steel Plate by DHCR
L-42: Solidification Path of Fe Bearing Phases in the Effect of Sr and Cooling Rate in Al-Si Hypoeutectic Alloys
Microstructural Characterization of Graphite Nodules in Fatigue-tested Ductile Cast Iron
Modeling of Air Entrainment and Inclusions in Steel Casting
Modeling of Mechanical Properties of Al Oxide Films Using Molecular Dynamics
Modelling of Defects in Aluminium Castings
Modelling the Effects of Fluid Flow on Microstructure Evolution at the Component Scale
Modification Efficiency of Sr in A360 and A413 and Its Relation with Melt Quality
Non-metallic Inclusions and Precipitates in High Quality Steels
Nucleation and Growth of Graphite in Ductile Cast Iron - Coupling between Experiments and Modelling
Numerical Predictions of Local Residual Stresses around Individual Graphite Nodules in Ductile Iron and Experimental Validation
Porosity Change of A356 by Excess Sr Addition
Porosity Formation and Shrinkage Effects in Alloy Samples Solidified on Earth and in Space as Observed In-situ by X-ray Monitoring
Prediction of Hot Tearing in Steel and Aluminum alloys
Progress and Developments in DC Casting of Aluminium Alloys
Quantification of A356 Melt Quality Change after Several Recycling
Quantification of Porosity in Electron Beam Welded Dissimilar Steel to Fe-Al Alloy Joints by X-ray Computed Tomography
Reducing Freckle Formation with External Magnetic Fields
Rejection Rate-melt Quality Relationship in High Pressure Die Casting of Al-Si Alloys
Role of Grain Refiners on Porosity Formation in Directionally Solidifed Al-Si Alloys
Self-Healing Micro-Porosity in Ductile Iron by Controlling Graphite Nodule Solidification Kinetics
Study for the Initiation Locations of Longitudinal Surface Cracks on Beam Blank in the Mold of Continuous Casting
Study of The Species Macro-segregation in A356 Wheel Casting
The Influence of Mould Lubrication Index on Defect Formation during Continuous Casting of Steel
The Influence of SEN and Upper Nozzle Design on the Flow Character for the Slab Quality
The Mechanism of a Rapidly Solidified Structure in Spray Forming
The Nucleation and Growth of Hot Tearing during Strip Casting Steel
Theoretical Calculations for Pore Formation in Aluminum during Solidification
Thermal-Mechanical Model of Depression Formation in Steel Continuous Casting
Uncertainty Quantification in Modeling an Industrial High Pressure Die Casting Process
Update on Bifilms - The Fundamental Defect in Cast Metals.
Wetting Characteristics of CMSX-4 on Various Ceramic Substrates for Use in Investment Casting of Turbine Blades
X-ray Imaging of Solidification Cracking during Welding of Steel
X-ray Synchrotron Tomographic Investigation of Graphite Evolution in Near Eutectic Cast Irons

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