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Aging Precipitates and Strengthening Mechanism of T122 Boiler Steel

Han-Sheng BAO Shi-chang CHENG Zheng-dong LIU Shu-ping TAN

钢铁研究学报(英文版)

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 authors of the paper investigated the performance of aging precipitates of T122 steel, such as M23C6 carbide, Laves phase, MX phase and cu-rich phase, discussed the strengthening mechanism of the steel, and calculated athermal yield stress of lath substructure, dislocations and precipitates of the steel. It was found that lath substructure and dislocations dominate the strengthening attribution and precipitation hardening goes second to the strengthening attribution.

关键词: T122 heat resistant steel;strengthening;precipitate;substructure;dislocation

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