msepostdoc-list FW: Seminar Reminder for John Coleman's Prelim, Wednesday, June 28, at 8:30 a.m., in ARMS 1028. "Numerical Modeling of Equiaxed Solidification: Application to Direct Chill Casting"

[Son, Rosemary E]

Reminder for John Coleman's Seminar for his Preliminary Exam:

From: Son, Rosemary E
Sent: Wednesday, June 21, 2017 9:11 AM
To: 'msefaculty-list at ecn.purdue.edu' <msefaculty-list at ecn.purdue.edu>; 'msegradstudent-list at ecn.purdue.edu' <msegradstudent-list at ecn.purdue.edu>; 'msepostdoc-list at ecn.purdue.edu' <msepostdoc-list at ecn.purdue.edu>
Cc: 'John S Coleman' <colemaj at purdue.edu>; Son, Rosemary E <son39 at purdue.edu>
Subject: Seminar Reminder for John Coleman's Prelim, Wednesday, June 28, at 8:30 a.m., in ARMS 1028. "Numerical Modeling of Equiaxed Solidification: Application to Direct Chill Casting"

Please consider attending the following:

MATERIALS ENGINEERING
SEMINAR


"Numerical Modeling of Equiaxed Solidification: Application to Direct Chill Casting"


By
John S. Coleman
Purdue MSE Ph.D. Preliminary Exam

Advisor: Professor Matthew J. M. Krane



ABSTRACT


The relative motion of the solid and liquid phases during alloy solidification produces long range composition heterogeneities (macrosegregation) that lead to unwanted mechanical property variations in the final product. The addition of grain refiners to promote heterogeneous nucleation of equiaxed grains, typical of direct chill (DC) casting, presents further complications since the grains are free to move and grow in the natural convection flow of the bulk liquid until their eventual coalescence into a packed bed. Several numerical models have been proposed to elucidate the interplay between various transport phenomena responsible for the formation of grain structure and macrosegregation during equiaxed solidification. These models are evaluated in terms of their applicability to DC casting and a volume-averaged model is chosen based on its ability to resolve the microscale and macroscale phenomena concurrently. The phenomenological submodels which provide model input are further evaluated and areas of future research are addressed.



Date: Wednesday June 28, 2017

Time: 8:30 A.M.
Place: ARMS 1028



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