Aging Precipitates and Strengthening Mechanism of T122 Boiler Steel

钢铁研究学报(英文版), 2010, 17(2): 67-73.

^1, , ^2, , ^3, , ^4,

1.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China

2.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China

3.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China

4.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China;School of Astronautics,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China

基金项目: 国家高技术研究发展计划(863计划)(2006AA03Z513)

Aging Precipitates and Strengthening Mechanism of T122 Boiler Steel

BAO Han-sheng ^1, , CHENG Shi-chang ^2, , LIU Zheng-dong ^3, , TAN Shu-ping ^4,

1.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China

2.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China

3.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China

4.Institute of Structure Materials,Central Iron and Steel Research Institute,Beijing 100081,China;School of Astronautics,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China

Keywords： T122 heat resistant steel

T122 steel has been used to produce superheater or reheater of ultra supercritical boilers. With the help of chemical phase extraction and microstructure characterization, the performance of aging precipitates of T122 steel, such as M_(23)C_6 carbide, Laves phase and MX phase was investigated, the strengthening mechanism of the steel was discussed, and the thermal yield stress of lath substructure, dislocations and precipitates of the steel were calculated. It was found that lath substructure and dislocations dominated the strengthening attribution and precipitation harden-ing went second to the strengthening attribution.

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