Masters Theses

Abstract

"Rare earth metals have for some years been used as an inoculant in nonferrous foundry practice and lately in the production of nodular iron. It has been reported that addition of rare earth metal to certain grades of stainless steel so improve the hot malleability that reduction of large size ingots in the blooming mill is now possible. It has been reported that considerable improvement in soundness and mechanical properties of steel castings and wrought products have been attained as a result of small additions of rare earth metals and oxides. In practically all investigations, it has been reported that most of the properties such as workability, strength, impact properties, and oxidation resistance, improve by the addition of about two pounds per ton of rare earths. Some of the authors consider rare earth metal additions as a penicillin for steel castings in solving production difficulties. There have been some contradictions as to the degree of improvement affected by rare earth additions, but none of the useful properties of steel have been found to be impaired. The American Metallurgical Products Company of Pittsburgh, Pennsylvania has even recommended a new system of steels being developed with rare earth additions.

The present investigation was undertaken to extend the information on improvement in properties and to find some causes of the drastic effects of rare earths. The work has been confined to low alloy steel composition, which is best suited for the production of steel castings. The various phases of the study included grain size determinations, desulfurization effects, as also the examination of inclusions, all of which affect properties of steel considerably. The properties of rare earth metals have been studied and an effort made to analyze the thermodynamic possibilities of their action. The use of fluorides of rare earths was included to see if they have the same effect as oxides and metals.

The investigation will be useful to show the effects more clearly on the steel quality, by the addition of rare earth elements, and may help in deciding upon the application of these elements for certain specific steels"--Introduction, pages 1-2.

Advisor(s)

Eppelsheimer, Daniel S., 1909-1988

Committee Member(s)

Schlechten, A. W.
Schrenk, Walter T.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1959

Pagination

vi, 72 pages

Note about bibliography

Includes bibliographical references (pages 62-64).

Rights

© 1959 Sukh Dev Sehgal, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Rare earth metal alloys
Steel alloys -- Additives

Thesis Number

T 1204

Print OCLC #

5924618

Electronic OCLC #

946961393

Included in

Metallurgy Commons

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