Award Date

12-2004

Degree Type

Thesis

Degree Name

Master of Science in Mechanical Engineering (MSME)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy, Chair

Second Committee Member

Anthony E. Hechanova

Third Committee Member

Brendan J. O'Toole

Graduate Faculty Representative

Rama Venkat

Number of Pages

82

Abstract

Martensitic Alloy HT-9 has been tested for its evaluation of stress corrosion cracking resistance in neutral and acidic solutions at ambient and elevated temperatures incorporating smooth and notched cylindrical specimens under constant load and slow strain rate (SSR) conditions. C-ring and U-bend specimens have also been tested for stress corrosion cracking evaluation in the acidic solution. The role of hydrogen on the cracking tendency has been evaluated by cathodic applied potential.

The results of constant load testing enabled the determination of the threshold stress for stress corrosion cracking in susceptible environments. The magnitudes of ductility parameters were reduced with increasing temperature. C-ring specimens showed cracking. Secondary cracks were observed by optical microscopy in specimens tested by the SSR technique. Fractographic evaluations by scanning electron microscopy revealed dimpled microstructure indicating ductile failure, and intergranular/transgranular brittle failures along the primary fracture face of the tested specimens.

Keywords

Harry Reid Center; Loads (Mechanics); Martensitic stainless steel – Cracking; Metals – Hydrogen embrittlement; Strains and stresses; Stress corrosion

Disciplines

Materials Science and Engineering | Mechanical Engineering | Metallurgy | Nuclear Engineering

Language

English

Comments

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