Show simple item record

dc.contributor.authorJhajj, Kamalpreet
dc.date.accessioned2015-08-28 15:48:34 (GMT)
dc.date.available2015-08-28 15:48:34 (GMT)
dc.date.issued2015-08-28
dc.date.submitted2015
dc.identifier.urihttp://hdl.handle.net/10012/9616
dc.description.abstractIn hot forming die quenching, furnaces are used to austenitize ultra high strength steel blanks. In the case of coated steels, like Usibor® 1500 P, furnace heating also transforms a protective Al-Si layer into a permanent Al-Si-Fe intermetallic coating. Modeling this process requires knowledge of the thermophysical properties of the material, specifically, radiative properties and how the sensible energy and latent heat of austenitization change with blank temperature. While the sensible energy is known, there is considerable uncertainty regarding the radiative properties and the latent heat of austenitization. In this work the effective specific heat of Usibor® 1500 P is inferred through inverse analysis of temperature data collected on coupons heated in a muffle furnace. This technique is first used to validate the heat transfer model, and then used to reveal the distribution of latent heat of austenitization at higher temperatures. The characterization of the radiative properties is carried out on Gleeble-heated coupons using a near-infrared spectrometer and a Fourier transform infrared reflectometer. Obtained thermophysical properties are employed in developing a heat transfer model for the patched blanks to gain insight into the non-uniform heating of patched blanks. The thermocouple measurements carried out in muffle and roller hearth furnaces are used to validate the modeled temperatures. Various strategies to optimize the heating process for patched blanks are proposed and evaluated, including the use of a high emissivity coating to compensate for the increased thermal mass of the patch.en
dc.language.isoenen
dc.publisherUniversity of Waterloo
dc.subjectFurnace Modelingen
dc.subjectRoller Hearth Furnaceen
dc.subjectHot Forming and Die Quenchingen
dc.titleHeat Transfer Modeling of Roller Hearth and Muffle Furnaceen
dc.typeMaster Thesisen
dc.pendingfalse
dc.subject.programMechanical Engineeringen
uws-etd.degree.departmentMechanical and Mechatronics Engineeringen
uws-etd.degreeMaster of Applied Scienceen
uws.typeOfResourceTexten
uws.peerReviewStatusUnrevieweden
uws.scholarLevelGraduateen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record


UWSpace

University of Waterloo Library
200 University Avenue West
Waterloo, Ontario, Canada N2L 3G1
519 888 4883

All items in UWSpace are protected by copyright, with all rights reserved.

DSpace software

Service outages