Award Date

1-1-2004

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy

Number of Pages

85

Abstract

High temperature tensile properties of quenched and tempered martensitic Type 422 stainless steel, a target structural material, have been evaluated in this study at temperatures ranging from ambient to 600°C as a function of three different tempering times. Results of tensile testing indicate that the ultimate tensile strength, yield strength and failure strength were gradually reduced with increasing temperature. However, as expected, the ductility parameters were enhanced due to increased plastic flow at elevated temperatures. The results of stress corrosion cracking tests performed by slow strain rate technique in the 90°C acidic solution revealed higher failure stress and reduced ductility to some extent for specimens tempered for longer time. The results of localized corrosion studies conducted by cyclic potentiodynamic polarization technique indicate that the critical corrosion potential became more active (negative) at higher testing temperature in specimens exposed to both neutral and acidic environments. Evaluation of the primary fracture face by scanning electron microscopy revealed more cracks at ambient temperature with smaller plastic zone size. Increased ductility was observed at elevated temperatures showing larger dimpled areas.

Keywords

Behavior; Corrosion; Deformation; Effects; Heat; Stainless; Steel; Treatment; Type

Controlled Subject

Mechanical engineering; Materials science; Materials science

File Format

pdf

File Size

2672.64 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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