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http://dx.doi.org/10.3365/KJMM.2012.50.1.001

Fracture Resistances of Y2O3 Particle Dispersion Strengthened 9Cr Steel at Room Temperature and High Temperatures  

Yoon, Ji Hyun (Korea Atomic Energy Research Institute)
Kang, Suk Hoon (Korea Atomic Energy Research Institute)
Lee, Yongbok (Korea Atomic Energy Research Institute)
Kim, Sung Soo (Korea Atomic Energy Research Institute)
Publication Information
Korean Journal of Metals and Materials / v.50, no.1, 2012 , pp. 1-7 More about this Journal
Abstract
The fracture resistance and tensile properties of $Y_2O_3$ oxide dispersion strengthened steel containing 9 wt% Cr(9Cr-ODS) were measured at various temperatures up to $700^{\circ}C$. The fracture characteristics were compared with those of commercial E911 ferritic/martensitic steel. The strength of 9Cr-ODS was at least 30% higher than that of E911 steel at the test temperatures below $500^{\circ}C$. The strength difference between the two materials was almost diminished at $700^{\circ}C$. 9Cr-ODS showed cleavage fracture behavior at room temperature and unstable crack growth behaviors at $300^{\circ}C$ and $500^{\circ}C$. The J-R fracture resistance of 9Cr-ODS was much lower than that of E911 steel at all temperatures. It was deduced that the coarse $Cr_2O_3$ particles that were formed during the alloying process provided the crack initiation sites of cleavage fracture in 9Cr-ODS.
Keywords
nanostructured materials; mechanical alloying; fracture; mechanical properties; strength; microstructure; toughness;
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