TY - JOUR
T1 - Microstructural Characterization of Novel ZrO2 Dispersion-Strengthened 9Cr Steel by Spark Plasma Sintering
AU - K G, Raghavendra
AU - Dasgupta, Arup
AU - Karthiselva, N S
AU - Jayasankar, K.
AU - Bakshi, Srinivasa Rao
N1 - Funding Information:
The authors acknowledge the UGC-DAE-CSR, Kokilamedu for providing the extended Helios NanoLab—600i facility for SEM characterization. One of the authors, RKG, acknowledges Department of Atomic Energy, India, for fellowship and thank Dr. Manmath Kumar Dash, University of Birmingham, for his help during EBSD experiments.
Publisher Copyright:
© 2023, The Author(s).
PY - 2023/5/8
Y1 - 2023/5/8
N2 - Technologically important Oxide Dispersion-Strengthened steels are synthesized using ZrO2 as a dispersion strengthener instead of conventionally used Y2O3. Powder metallurgical route followed by spark plasma sintering is adopted for synthesizing the material. Detailed microstructural characterization revealed a finegrained 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 analysisthrough hardness measurements was correlated with microstructural observations and compared with the conventional Oxide Dispersion-Strengthened steels. The collective results indicate ZrO2 as a potentialalternate dispersoid for strengthening steel and future scope for vast exploration.
AB - Technologically important Oxide Dispersion-Strengthened steels are synthesized using ZrO2 as a dispersion strengthener instead of conventionally used Y2O3. Powder metallurgical route followed by spark plasma sintering is adopted for synthesizing the material. Detailed microstructural characterization revealed a finegrained 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 analysisthrough hardness measurements was correlated with microstructural observations and compared with the conventional Oxide Dispersion-Strengthened steels. The collective results indicate ZrO2 as a potentialalternate dispersoid for strengthening steel and future scope for vast exploration.
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U2 - 10.1007/s11665-023-08244-2
DO - 10.1007/s11665-023-08244-2
M3 - Article
SN - 1059-9495
JO - Journal of Materials Engineering and Performance
JF - Journal of Materials Engineering and Performance
ER -