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Vol.50, No.1, 1 ~ 8, 2012
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| Title |
| Fracture Resistances of Y2O3 Particle Dispersion Strengthened 9Cr Steel at Room Temperature and High Temperatures |
| 이용복 Yong Bok Lee , 김성수 Sung Soo Kim , 윤지현 Ji Hyun Yoon , 강석훈 Suk Hoon Kang |
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| Abstract |
| The fracture resistance and tensile properties of Y2O3 oxide dispersion strengthened steel containing 9 wt% Cr (9Cr-ODS) were measured at various temperatures up to 700oC. 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 500oC. The strength difference between the two materials was almost diminished at 700oC. 9Cr-ODS showed cleavage fracture behavior at room temperature and unstable crack growth behaviors at 300oC and 500oC. 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 Cr2O3 particles that were formed during the alloying process provided the crack initiation sites of cleavage fracture in 9Cr-ODS. |
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| Key Words |
| nanostructured materials, mechanical alloying, fracture, mechanical properties, strength, microstructure, toughness |
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