Award Date

1-1-2006

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy

Number of Pages

138

Abstract

The results of tensile testing involving austenitic Alloy C-276 indicated that this material is capable of maintaining adequate structural strength at temperatures relevant to the H2SO4 decomposition process related to the nuclear hydrogen generation. This alloy exhibited a unique phenomenon known as dynamic strain aging, which has been studied as a function of both temperature and strain rate. An average value of 55 KJ/mole has been determined to be the activation energy for plastic deformation under tensile loading at different temperatures. Increased crack extension was observed in wedge-loaded double-cantilever-beam specimens exposed to an acidic solution and subjected to higher initial stress intensity factor values. The self-loaded specimens did not exhibit cracking in the same environment. Ductile failures were observed at temperatures up to 600°C. However, intergranular brittle failures were observed at higher temperatures.

Keywords

Alloy; Crack; Fracture; Growth; Properties; Study; Tensile; Toughness

Controlled Subject

Mechanical engineering; Materials science

File Format

pdf

File Size

4505.6 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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