Masters Theses

Abstract

"The objective of this investigation was to establish the relationship between the nodule count, the matrix structure, and the cooling rate through the eutectoid in nodular iron. The chemical composition of the nodular iron was held constant while various inoculation methods, inoculants, and mold designs, including chills, were used to vary the solidification time and cooling rate through the eutectoid range. This produced variations in both the matrix structure and the nodule count.

The nodule count has a power relationship with the percent pearlite in the matrix at fixed cooling rates: Percent pearlite = K (Nodule count)-n where the constants Kand n in the relationship depend on the cooling rate through the eutectoid range. At fixed nodule counts, the percent pearlite in the matrix increases with increasing cooling rates; at low nodule counts, the percent pearlite increases rapidly with increasing cooling rate while at high nodule counts, the percent pearlite is relatively insensitive to increases in the cooling rate.

Decreasing the solidification time leads to higher nodule counts, with the relationship apparently being an inverse power function. Irons which were mold inoculated with barium containing inoculants produce higher nodule counts than uninoculated irons.

No conclusions could be reached concerning the relationship between the nodule count and the hardness due to variations in the data"-- Abstract, pp. ii-iii

Advisor(s)

Askeland, Donald R

Committee Member(s)

Wolf, Robert V., 1929-1999
Parry, Myron G.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

University of Missouri--Rolla

Publication Date

1974

Pagination

viii, 81 pages

Note about bibliography

Includes bibliographical references (pages 77-80)

Rights

© 1974 Subrata Sen Gupta, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 3084

Print OCLC #

6019461

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