【摘 要】
：
The σ-phase precipitation in 20％ cold-worked 15Cr-15Ni titanium-modified austenitic stainless steel was studied during long-term aging treatment.During the isothermal aging stage,the amount of σ-phase was significantly increased at beginning and gradually
【机 构】
：
Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research, Chinese Acade
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The σ-phase precipitation in 20％ cold-worked 15Cr-15Ni titanium-modified austenitic stainless steel was studied during long-term aging treatment.During the isothermal aging stage,the amount of σ-phase was significantly increased at beginning and gradually became constant.The aging time only slightly affected the size and morphology of the σ-phase.Conversely,during the isochronal aging stage,the amount of σ-phase grew rapidly with the increase in the aging temperature.The σ-phase with a large amount of stacking faults was prone to nucleate around the (Ti,Mo)C particles or at the grain boundaries.The (Ti,Mo)C particles can act as effective nucleation sites,where the σ-phase directly precipitates from the austenitic matrix.From this work,the growth of σ-phase is found to be influenced by the aging temperature,and a new mechanism of σ-phase precipitation from austenite has been proposed.
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