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Theoretical and Experimental Studies of Dissimilar Secondary Metallurgy Methods for Improving Steel Cleanliness.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Theoretical and Experimental Studies of Dissimilar Secondary Metallurgy Methods for Improving Steel Cleanliness./
Author:	Pitts-Baggett, April.
Description:	1 online resource (145 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 79-02(E), Section: B.
Subject:	Engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9780355351774

Theoretical and Experimental Studies of Dissimilar Secondary Metallurgy Methods for Improving Steel Cleanliness.
Pitts-Baggett, April.

Theoretical and Experimental Studies of Dissimilar Secondary Metallurgy Methods for Improving Steel Cleanliness. - 1 online resource (145 pages)

Source: Dissertation Abstracts International, Volume: 79-02(E), Section: B.

Thesis (Ph.D.)--The University of Alabama, 2017.

Includes bibliographical references

Due to a continual increasing industry demand for clean steels, a multi-depth sampling approach was developed to gain a more detailed depiction of the reactions occurring in the ladle throughout the Ladle Metallurgy Furnace (LMF) processing. This sampling technique allows for the ability for samples to be reached at depths, which have not been able to be captured before, of approximately 1.5 m below the slag layer. These samples were also taken in conjunction with samples taken just under the slag layer as well as in between those samples. Additional samples were also taken during the processing including multi-point slag sampling. The heats were divided in to five key processing steps: Start of heat (S), after Alloying (A), after desulfurization/start of pre-Rinse (R), prior to Ca treatment (C), and End of heat (E).

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355351774Subjects--Topical Terms:

561152
Engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Theoretical and Experimental Studies of Dissimilar Secondary Metallurgy Methods for Improving Steel Cleanliness.
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245 1 0 $a Theoretical and Experimental Studies of Dissimilar Secondary Metallurgy Methods for Improving Steel Cleanliness.
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300 $a 1 online resource (145 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 79-02(E), Section: B.
500 $a Adviser: Laurentiu Nastac.
502 $a Thesis (Ph.D.)--The University of Alabama, 2017.
504 $a Includes bibliographical references
520 $a Due to a continual increasing industry demand for clean steels, a multi-depth sampling approach was developed to gain a more detailed depiction of the reactions occurring in the ladle throughout the Ladle Metallurgy Furnace (LMF) processing. This sampling technique allows for the ability for samples to be reached at depths, which have not been able to be captured before, of approximately 1.5 m below the slag layer. These samples were also taken in conjunction with samples taken just under the slag layer as well as in between those samples. Additional samples were also taken during the processing including multi-point slag sampling. The heats were divided in to five key processing steps: Start of heat (S), after Alloying (A), after desulfurization/start of pre-Rinse (R), prior to Ca treatment (C), and End of heat (E).
520 $a Sampling sets were collected to compare the effects of silicon, desulfurization rates, slag emulsification, slag evolution and inclusion evolution. By gaining the ability to gather multiple depths, it was determined that the slag emulsification has the ability to follow the flow pattern of the ladle deeper into the ladle than previously seen in literature. Inclusion evolution has been shown by numerous researchers; however, this study showed differences in the inclusion grouping and distribution at the different depths of the ladle through Automated Feature Analysis (AFA). Also, the inclusion path was seen to change depending on both the silicon content and the sulfur content of the steel. This method was applied to develop a desulfurization model at Nucor Steel Tuscaloosa, Inc. (NSTI). In addition to a desulfurization model, a calcium (Ca) model was also developed. The Ca model was applied to target a finished inclusion region based on the conditions up to the wire treatment. These conditions included time, silicon content, and sulfur concentration. Due to the inability of this model to handle every process variable, a new procedure was created to provide a real time feedback via SparkDat (c) software installed in a ThermoFisher 4460 spectrometer.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Engineering. $3 561152
650 4 $a Materials science. $3 557839
655 7 $a Electronic books. $2 local $3 554714
690 $a 0537
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Alabama. $b Metallurgical Engineering. $3 1148517
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10265845 $z click for full text (PQDT)