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Vol.47, No.10, 621 ~ 629, 2009
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| Title |
| Effect of Thermomechanical Process on Mechanical Property and Microstructure of 9Cr-1Mo Steel |
| 김준환 Jun Hwan Kim , 백종혁 Jong Hyuk Baek , 한창희 Chang Hee Han , 김성호 Sung Ho Kim , 이찬복 Chan Bock Lee , 나광수 Kwang Su Na , 김성주 Seong Ju Kim |
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| Abstract |
| Thermomechanical processes were carried out to evaluate their effects on the mechanical and the microstructural property of a ferritic-martensitic steel. Modified 9Cr-1Mo steels were hot-rolled at a temperature of either 780℃ or 850℃ after normalizing at 1050℃ and then were air-cooled. Continuous annealing at 850℃ for 2 hours immediately after the hot rolling was also performed and they were compared to the specimens without thermomechanical process. The result showed that there were little differences between the hot rolled specimens in terms of the precipitation density and size. However, V content inside the MX precipitates increased in the case of the specimen rolled at 850℃. The application of the continuous annealing induced coarsening of the Nb-rich MX precipitation as well as an increase in the amount of V-rich MX precipitation, which is expected to enhance high temperature mechanical properties of the ferritic-martensitic steel. |
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| Key Words |
| ferritic-martensitic steel, thermomechanical process, hot rolling, annealing, precipitation |
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