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

86

Abstract

T91 grade steels containing 1 and 2 weight percent (wt %) silicon (Si), custom-melted by vacuum-induction melting practice, were tested for evaluation of their metallurgical and corrosion properties. The results of tensile testing indicate that both the yield strength and the ultimate tensile strength were gradually reduced with increasing temperature (ambient to 550°C). For material containing 2 wt % Si, the failure strain was significantly enhanced at 550°C, indicating enhanced ductility. No failures were observed in an acidic solution at constant-load irrespective of their Si content. The magnitude of all parameters obtained from the slow-strain-rate testing was gradually reduced with increasing temperature. However, T91 grade steel containing 2 wt % Si showed better SCC resistance in terms of its ductility possibly due to the formation of more protective oxide layers due to higher Si content. In general, the corrosion potential became more active at higher temperatures. T91 grade steel containing 1 wt % Si showed relatively more brittle failures compared to the higher Si-containing alloy.

Keywords

Characterization; Content; Corrosion; Function; Martensitic; Metallurgical; Silicon; Stainless; Steel

Controlled Subject

Mechanical engineering; Materials science

File Format

pdf

File Size

3358.72 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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