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Meeting Liquid Metal Processing & Casting Conference (LMPC 2022)
Symposium Liquid Metal Processing & Casting Conference (LMPC 2022)
Presentation Title Comments on the Columnar/Equiax Transition in Remelted Ingots
Author(s) Alec Mitchell
On-Site Speaker (Planned) Alec Mitchell
Abstract Scope The columnar/equiax transition (CET) during solidification is often observable in ingots remelted by ESR or VAR. It is associated with enhanced segregation, porosity and larger non-metallic inclusion sizes. It is therefore advisable that the process melting parameters avoid the effect. These actions influence the process cost hence requiring definition of the CET onset. We outline the causes of the CET in alloys commonly remelted: also relate it to the solidification rate and temperature gradient. Most present melting operations cause the ingot central regions to solidify under conditions close to the CET onset driven either by dendrite fragmentation or the presence of nucleating particles depending on the alloy composition. It is suggested that melting conditions can be optimised by using the CET onset information together with suitable process models.
Proceedings Inclusion? Definite: At-meeting proceedings


The Road to Zero Defects in Nickel Superalloys
A Novel Technique to Measure the Arc Gap During Vacuum Arc Remelting Using Magnetic Fields
A Numerical Study on the Impact of a Time-varying Axial Magnetic Field On An Industrial Vacuum Arc Remelting (VAR) Process
Characterization of the Inclusion-induced Surface Defects in Thin-gauge 1xxx, 3xxx and 5xxx Series Al-based Products
Characterization of Vacuum Arc Remelting with a High-density Magnetic Sensor Array
Comments on the Columnar/Equiax Transition in Remelted Ingots
Comparison of the Degassing Efficiency for Different Injector Types
DANIELI Special Metallurgy, Introduction of a Key Player's New Product Line
Design of ESR Slags According to Requested Physical Properties. Part 4: Thermal Conductivity
Development of an Acoustic Levitation Based Contactless Metrological Apparatus: Applications to Surface Tension and Viscosity Measurements of Low Melting Temperature Ga Droplets
Discrete Liquid Flow in a Random Packed Bed with Implications to Iron Making Blast Furnace
Dissolution of Al2O3, MgO·Al2O3 and SiO2 in Alkali Oxide Containing Secondary Metallurgical Slags
Effect of AC Frequency on Melting Conditions During Electroslag Remelting
Effect of Solidification Condition on Sulfide Morphology in Free Machining Austenitic Stainless Steel
Effect of Transient Heat Flux on the Predictions of Pool Characteristics During Vacuum Arc Remelting of Nitinol
Effects of Controllable Transverse Magnetic Fields During the VAR Melt Process
Electrode Immersion Depth Influence in the ESR Process : an Experimental and Numerical Study
Elimination of Defects in Titanium Using PAM-CHR Melting
Enhanced Material Properties in Advanced Air Casting Applications by Means of Vacuum Cap (VCAP) Furnace Process
Experimental Setup for Mold Surface Temperature Measurement During Vacuum Arc Remelting Process: Application to Titanium Alloys
Extension of Investment Casting Process Simulation by Electromagnetic Modelling of the Pre-process Step of Billet Induction Melting
Final Chemical Composition Variations Due to the Effect of Different Power Input Rates During VIM Melting for Superalloy Investment Castings
Identifying Borides Inclusion in Aluminum Melt Using EDXRF for Small Spot Analysis
Impact of Fill Factor on Electro-slag Remelting Operations
Investment Casting with Unique Levitation Melting Technology - FastCast
Kinetics of Oxygen Removal by Carbothermic Reduction from Steel Melts Under Vacuum Pressures
Manufacturing Large Superalloy Ingots for Advanced Energy Systems
Modeling Electrochemical Effects on Electric Current Distribution in Electroslag Remelting (ESR) Process
Nitinol Electroslag Remelting: Initial Slag Study
Power Update During Vacuum Arc Remelting Using Vision Systems
Segment Casting- a Semi-continuous Casting Technology for High-end Semi-finished Products Enters the Market
Segregation of Impurities in Metallic Lithium Through Melt Settling
Simulation of the Arc Dynamics During the VAR Process
Slag Degassing for Electroslag Remelting using Cold Start
Swing Control in ESR- Challenges, Influences and Outlook on a Key Control Parameter to Obtain Superior Ingots
Transient Heat Flux Measurements in Vacuum Arc Remelting of Nitinol
Use of Accommodation Coefficients in Modeling of Helium Heat Transfer in VAR: Examination of Their Uncertainty and Effect on Modeling
Validation of Electro-slag Remelting (ESR) Process Simulations for HAYNES®282® Alloy Slab Ingots
VAR and ESR Steels -a Critical Appraisal

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