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| Effect of Quenching Cooling Rate on the Toughness of 30CrMoNiV511 Steel for Steam Turbine Rotor |
| HUANG Junbo* HE Yi, HUO Jie, YIN Fuxing |
| (Materials Research Institute for Energy Equipment, China First Heavy Industries, Tianjin 300457) |
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Cite this article:
HUANG Junbo， HE Yi, HUO Jie, YIN Fuxing. Effect of Quenching Cooling Rate on the Toughness of 30CrMoNiV511 Steel for Steam Turbine Rotor. Chinese Journal of Materials Research, 2013, 27(3): 331-337.
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Abstract Quenching cooling at different radius positions of large-scale steam turbine rotor were simulated by air-cooling heat treatment furnace. The effects of quenching cooling rate on microstructure, strength and toughness of 30CrMoNiV511 rotor steel were investigated. The results show that the cooling rate has a little influence on the strength, while the toughness evidently depends on it. As the cooling rate decrease gradually from 50 ℃/min to 7 oC/min, and the transformed microstructure changes from low bainite to upper bainite, granular bainite and their mixture. Meanwhile, impact toughness decreases sharply from 66 J to 16 J. When the cooling rate is below 5 ℃/min, proeutectoid ferrite is formed. The sub-unit of ferrite in upper bainite is coarse with uneven distribution of carbides, which results in extremely low toughness. The microstructure and carbides shape and distribution depending on the quenching cooling rate is one of the main reasons determining the impact toughness of rotor steel.
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Received: 03 April 2013
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| About author: *To whom correspondence should be addressed, Tel: (022)59835572, E-mail: alan198203@163.com |
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