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Precipitates evolution and tensile behavior of wrought Ni-based ati 718plus superalloy during long-term thermal exposure

引用

Science China(Technological Sciences) 2022年第6期65卷 1283-1299页

作者： GUO QianYing JI KangKang ZHANG Teng QIAO ZhiXia LI Chong LI Jun LIU ChenXi LIU YongChang State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300354China Southwestern Institute of Physics Chengdu 610041China School of Mechanical Engineering Tianjin University of CommerceTianjin 300134China

In this paper,the microstructure evolution and tensile behavior of wrought ati 718 plus superalloy during long-term thermal exposure(LTTE) were *** γ’ phase evolves from spherical morphology to cuboidal morphology at 800℃,which is related to increasing γ’/γ misfit because of the increase of elastic *** amounts of η phase obviously increased and γ’ precipitate free zones(PFZs) were found in 800-LTTE samples due to the increase of η phase amount by consuming Al,Ti,and *** to the formula of “MC+γ→M_(23)C_(6)+η”,η phase is also related to the decomposition of MC carbide,which involves the diffusion and segregation of Nb and *** addition,some short rod-like and irregular Cr,Mo-rich σ phases were prone to precipitate near η phases after LTTE at 800℃ for 500 and 1000 h.σ phase has a crystallographic relationship with ηphase as(002)_(σ)//(10■0)_(η),[0■0]_(σ)//[01■0]_(η).The deteriorated tensile strength after LTTE is mainly attributed to that:(1) the evident coarsening of γ’ phase results in that the deformation mechanism transforms from stacking faults(SFs) shearing to Orowan looping,which is also convinced by calculated critical resolved shear stress(CRSS);(2) the noticeable increasing number of η phase contributes to stress concentration,resulting in micro-cracks formation;and (3) the apparently increasing number of η phase promotes the PFZs formation.

关键词： ati 718plus superalloy long-term thermal exposure γ’coarsening ηphase σphase deformation mechanism

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