论文部分内容阅读
The microstructure of Cr_(25)Ni_(20)stainless steel under plastic deformation up to 50% has re-vealed an even distributed twins,micro-twins and deformation bands.The σ-phase formationin 800℃ aged specimens is accelerated by its nucleation at either deformation twins orrecrystallized grain boundaries under less or more deformation respectively.In therecrystallized zone,the recrystallization is prior to the precipitation of σ-phase.Althoughrecrystallization may accelerate the formation of σ-phase,it is not essential.The twins andmicro-twins produced by deformation may also provide the additional nucleation sites.
The microstructure of Cr_ (25) Ni_ (20) stainless steel under plastic deformation up to 50% has re-vealed an even distributed twins, micro-twins and deformation bands.The σ-phase formation in 800 ℃ aged specimens is accelerated by its nucleation at either deformation twins orrecrystallized grain boundaries under less or more varying respectively.In. therecrystallized zone, the recrystallization is prior to the precipitation of σ -phase.Although crystallization may accelerate the formation of σ-phase, it is not essential. twins and micro-twins produced by deformation may also provide the additional nucleation sites.