Masters Theses

Siri Ram Rai

Abstract

"Four different tool steels--AISI 01, Sl, A9 and Tl5--were obtained in the 1/2-inch diameter hot rolled and air-cooled condition from the steel mill. The lower critical temperatures of these steels were determined. The spheroidization of each steel by three different spheroidizing procedures was evaluated with the use of hardness testing and metallographic techniques. Isothermal annealing completely spheroidized each steel yielding coarse carbides and low hardness. Cyclic annealing was an effective spheroidization procedure only for 01 and Tl5 steels. Hardening and tempering resulted in rather fine spheroidized structures in these steels. The total time consumed to produce the best spheroidized structures obtained in A9 and Tl5 steels was less, and in 01 and Sl steels was more than the time taken in the manufacturer's industrial spheroidizing processes. However, an acceptable spheroidized microstructure with specified hardness was obtained in each steel investigated using less time than that expended in commercial processes"-- Abstract, p. ii

Advisor(s)

Kisslinger, Fred, 1919-2010

Committee Member(s)

Askeland, Donald R.
Sorrell, Charles A.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

University of Missouri--Rolla

Publication Date

1975

Pagination

xii, 92 pages

Note about bibliography

Includes bibliographical references (pages 87-88)

Rights

© 1975 Siri Ram Rai, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 4020

Print OCLC #

5982013

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Metallurgy Commons

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