• Jayasankar, K.
• Karthiselva, N. S.
• Bakshi, Srinivasa Rao

Abstract

<jats:title>Abstract</jats:title><jats:p>Technologically important Oxide Dispersion-Strengthened steels are synthesized using ZrO<jats:sub>2</jats:sub> as a dispersion strengthener instead of conventionally used Y<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>. Powder metallurgical route followed by spark plasma sintering is adopted for synthesizing the material. Detailed microstructural characterization revealed a fine-grained microstructure with finer dispersoids in as-sintered and normalized condition. The stable microstructure is found to be retained even after subjecting the samples at 973 K for as long as 1000 h for long-term thermal aging trials, indicating at a possible superiority of this material over the conventional Oxide Dispersion-Strengthened steels. The yield strength is calculated by making use of microstructural parameters and predictive models, both of which shown a good agreement. Mechanical property analysis through hardness measurements was correlated with microstructural observations and compared with the conventional Oxide Dispersion-Strengthened steels. The collective results indicate ZrO<jats:sub>2</jats:sub> as a potential alternate dispersoid for strengthening steel and future scope for vast exploration.</jats:p>

Topics

• impedance spectroscopy
• dispersion
• strength
• steel
• hardness
• aging
• yield strength
• sintering
• aging