Date | Time
04/04/2017 | 2 h 30 min - 6 h 00 min
Salle du Conseil – IJL – Saurupt
Seminar by Matthew KRANE, Invited professor by LabEx DAMAS (WP3)
Matthew John M. Krane
Professor of Materials Engineering
Purdue Center for Metal Casting Research
West Lafayette, Indiana
Remelting processes provide routes to large ingots of specialty metals which have relatively few defects. However, beyond certain limits on ingot size and process speed, several types of defects begin to occur. The heat, mass and momentum transfer and electromagnetics occurring during vacuum arc and electroslag remelting (VAR and ESR) are modeled and sump profiles, macrosegregation patterns, and melt rates are predicted. These results are studied as functions of process parameters and ingot size. During VAR of titanium alloys, DC current levels are sometimes high enough that the sump flow is controlled by Lorentz forces, leading to segregation patterns different from those produced by buoyancy driven flows. The numerical simulations include studies of those two distinct flow regimes in VAR: strong Lorentz driven flow down the center of the sump and weak buoyancy driven flow in the opposite direction. The results demonstrate possible influence of process instabilities on the flow regime and thus macrosegregation. During ESR of nickel-based superalloys, freezing and remelting of a slag skin between the ingot and mold changes the thermal response of the ingot and the electrode melt rate. Preliminary work on uncertainty quantification in this ESR model has been completed and implications for comparison of model results to plant data is discussed.
Dr. Matthew Krane is a Professor of Materials Engineering at Purdue University and a member of the Purdue Center for Metal Casting Research. His research is on design, development, and modeling of materials processes, particularly the solidification processing of metal alloys. Research projects include numerical process modeling of vacuum arc and electroslag remelting and direct chill casting, studying the effects of transport phenomena and thermal strain on the formation and prevention of solidification defects. He has also worked on the through-process modeling of industrial wrought aluminum alloy production, from direct chill casting to various heat treat processes. Other projects examine exergy destruction in pyrometallurgical processing of copper, the investment casting of superalloy parts with thin sections, the microstructural modeling of dendritic growth, homogenization microstructure development, and the prediction of heat transfer in high pressure die casting. Many of these projects include the quantification of uncertainty propagation through the models.
Prof. Krane has been with Purdue Materials since 1996, but his education is three degrees in mechanical engineering (Cornell, BS, ’86; U. Pennsylvania, MS, ’89; Purdue, PhD, ’96), with a concentration in heat transfer and fluid flow. In addition to consulting with the metals processing industry, his industrial experience includes three years working on thermal issues in design and manufacturing of electronics packaging. Professor Krane’s teaching experience includes heat transfer, fluid mechanics, process design, solidification, materials processing, numerical methods, extractive metallurgy, and ethics in engineering practice.