Masters Theses

Jun Ge

Abstract

"For the ingot casting process, fluid flow of steel plays an important role in quality control and industrial operations. Using CFD software (FLUENT), this study overviews the fluid flow pattern in the bottom-teeming ingot filling process with three different swirl-modified upgate designs. Turbulent flow and mass transfer are considered main factors in controlling the process. The motion of the slag phase was also considered. In addition to the modeling studies, inclusions in stainless steel poured into ingots with a traditional and a swirl-modified upgate system were investigated using an optical microscope, SEM-EDS and ASPEX automated feature analysis technology. The main inclusions observed were Al₂O₃, MnS, and oxide-sulfide. This work provides a comprehensive description and understanding of the morphology and distribution of inclusions in bottom-poured ingot casting. Fewer inclusions were observed at the center and mid-radius of the swirl-modified ingot than that of the traditional ingot. More inclusions were found at the center of the ingot than nearer the walls. The re-designed upgate system did have positive effect on the flow pattern in the ingot and indirectly cause fewer inclusions in size range of 0~10µm, but made no major difference beyond the change in the smallest size range."--Abstract, page iii.

Advisor(s)

Zhang, Lifeng (College teacher)
Peaslee, Kent D., 1956-2013

Committee Member(s)

Richards, Von

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Materials Science and Engineering

Sponsor(s)

Ingot Metallurgy Forum

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2012

Pagination

x, 83 pages

Note about bibliography

Includes bibliographical references (page 44).

Rights

© 2012 Jun Ge, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Fluid dynamicsStainless steelSteel castingsSteel ingots

Thesis Number

T 10113

Print OCLC #

841761198

Electronic OCLC #

811137860

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