Award Date

1-1-2005

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy

Number of Pages

115

Abstract

Tensile testing involving Alloy C-22 and Nb1Zr exhibited reduced strength with increasing temperature within a range relevant to the Hlx decomposition process. A reduction in failure strain was however, noted, at 100°C possibly due to dynamic strain aging effect. Even though the ductility parameters were not influenced by the change in temperature in stress-corrosion-cracking (SCC) testing in an acidic solution the true in this alloy was reduced appreciably. Nb1Zr did not exhibit any failure stress conventional SCC pattern. The critical potentials for localized corrosion in both alloys became more active at higher temperatures. No cracking was observed with C-ring and U-bend specimens of Alloy C-22 in a similar environment at 150°C. The corrosion rate of Alloy C-22 was gradually reduced for exposure up to 28 days followed by an enhancement at a longer duration. The characterization of primary fracture surface of cylindrical specimens used in tensile and SCC testing exhibited dimpled microstructure, indicating ductile failures.

Keywords

Characterization; Corrosion; Cycle Materials; Metallurgical Structural

Controlled Subject

Materials science; Mechanical engineering; Materials science

File Format

pdf

File Size

1802.24 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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