Masters Theses

Abstract

"Abrasive wear testing of lightweight, austenitic Fe-Mn-AI-C cast steel has been performed in accordance with ASTM G65 using a dry sand, rubber wheel, abrasion testing apparatus. Testing was conducted on a series of Fe-30Mn-XAI-YC-1Si-0.5Mo chemistries containing aluminum levels from 2.9 to 9.5 wt.% and carbon levels from 0.9 to 1.83 wt.%. Solution treated materials having an austenitic microstructure produced the highest wear resistance. Wear resistance decreased with higher aluminum, lower carbon, and higher hardness after age hardening. In the solution treated condition the wear rate was a strong function of the aluminum to carbon ratio and the wear rate increased with a parabolic dependence on the AI/C ratio, which ranged from 1.8 to 10.2. Examination of the surface wear scar revealed a mechanism of plowing during abrasion testing and this method of material removal is sensitive to work hardening rate. Work hardening behavior was determined from tensile tests and also decreased with increasing AI/C ratio and after aging hardening. The loss of wear resistance is related to short range ordering of AI and C in the solution treated materials and K-carbide precipitation in age hardened materials and both contribute to planar slip and lower work hardening rates. A high carbon tool steel (W1) and a bainitic low alloy steel (SAE 8620) were also tested for comparison. A lightweight steel containing 6.5 wt.% AI and 1.2 wt.% C has wear resistance comparable to within 5% of the bainitic SAE 8620 steel forging currently used for the Bradley Fighting Vehicle track shoe and this cast Fe-Mn-AIC steel, at equivalent tensile properties, would be 10% lighter"--Abstract, page iii.

Advisor(s)

Van Aken, David C.

Committee Member(s)

Richards, Von
Peaslee, Kent D., 1956-2013

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2013

Pagination

x, 122 pages

Note about bibliography

Includes bibliographical references (pages 118-121).

Rights

© 2013 Samuel August Buckholz, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Austenitic steel -- Abrasion resistance -- TestingManganese steel -- Abrasion resistanceAluminum alloysCarbon compositesMicrostructure -- TestingHardness -- Testing

Thesis Number

T 10324

Print OCLC #

860992744

Electronic OCLC #

908574551

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