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Effect of Mg addition on temper embrittlement in 2.25cr–1mo steel doped with 0.056% P–Mg segregation behavior at grain boundary

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Journal of Iron and steel Research(International) 2021年第10期28卷 1259-1267页

作者： Xiao-bing Li Xin Dong Peng-xiang Zhao Wei-wei Xing Lei-lei Ding Nan-nan Zhang Ying-che Ma Kui Liu Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of ScienceShenyang110016LiaoningChina CAS Key Laboratory of Nuclear Materials and Safety Assessment Shenyang110014LiaoningChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026AnhuiChina

To verify the microalloying function and segregation behavior of trace Mg at grain boundary in steel,the 2.25cr–1mo steel doped with 0.056%P containing different Mg contents was refined with a vacuum-induction furnace.The effects of trace Mg addition on the temper embrittlement susceptibility of 2.25cr–1mo steel were studied by step-cooling test and the segregation behavior of Mg at grain boundary was explored by Auger electron spectroscopy.It is shown that P-induced temper embrittlement susceptibility can be reduced after subjecting to step-cooling treatment with trace Mg addition,mainly benefited from the segregation of Mg at grain boundary.This segregation can decrease the segregation amounts of P and S,especially for P,and increase the grain boundary cohesion,reducing the adverse effect on temper embrittlement caused by P and S.

关键词： 2.25cr-1mo steel Temper embrittlement Mg P Segregation Auger electron spectroscopy

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Precipitation kinetics of carbides during cyclical and isothermal aging of 2.25cr–1mo steel and its effect on mechanical properties

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Journal of Iron and steel Research(International) 2021年第10期28卷 1282-1290页

作者： Maribel Leticia Saucedo-Muñoz ESIQIE Instituto Politécnico NacionalMexico07300Mexico

The carbide precipitation was analyzed during aging of 2.25cr–1mo steel at 550℃.The as-received steel was aged in two different manners:the first treatment was an isothermal aging at 550℃ for time up to 1000 h,and the second one was carried out by a cyclical aging,which consisted of aging at 550℃ for 1 h,water quenching at room temperature and then newly heating at 550℃.This procedure was repeated up to 300 times.The M_(23)C_(6) and M6C carbide precipitation took place intragranularly and intergranularly for both aging treatments.The carbide coarsening was detected to occur with the increasing aging time.Nevertheless,the growth kinetics of precipitation occurred more rapidly in the case of cyclical aging.The specimen hardness decreased with the aging time in both cases;however,it occurred in shorter aging time for the cyclical aging.Nanoindentation testing indicated the increase in ductility with the aging time,and the cyclically aged specimens showed larger ductility than the isothermally aged specimens.

关键词： 2.25cr-1mo steel Precipitation Isothermal heating Cyclical heating Mechanical property

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KINETICS OF TEMPER EMBRITTLEMENT IN 2.25cr-1mo steel USED FOR HOT-WALL HYDROFINING REACTORS

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Acta Metallurgica Sinica(English Letters) 2004年第2期17卷 139-146页

作者： J.Z.Tan CollegeofMechanicalandPowerEngineering NanjingUniversityofTechnologyNanjing210009China

Based on the theory of grain boundary segregation, a kinetics model of temper em-brittlement caused by long-term service for hot-wall hydrofining reactors was studied.The kinetics model was applied to phosphorus (P) segregation in 2.25cr-1mo steelused for a hot-wall hydrofining reactor, and the kinetics of grain boundary segrea-tion of impurity P in the steel exposed to the process environment of the hydrofiningreactor was calculated on the basis of the model. The Auger electron spectroscopytest was performed in order to determine the grain boundary concentration of P. Theexperimental result is agreement with the theoretical calculated data. The results showthat the kinetics equation is reasonable for predicting the levels of grain boundarysegregation of impurity P in 2.25cr-1mo steel used for hot-wall hydrofining reactors.

关键词： hydrofining reactor 2.25cr-1mo steel temper embrittlement kinetics

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