测定并分析了Ni9钢薄膜及电解萃取回转奥氏体(γ')的Mossbauer谱.结果表明:Ni9钢中Fe原子共有4种核环境,其中,以具有n=2 Ni配位的Fe原子为主的Fe-Ni原子集团处于转变为γ'相的临界状态.在α+γ相区加热水冷后,这类原子集团稍多,且转变为γ'的效率很高,生成的γ'相比较稳定,其数量随回火温度提高而增加,则与Ni原子的迁移富集有关。
The Mossbauer spectra of Ni9 steel foil and extracted return austenite, γ′, have been studied. Four kinds of surrounding for Fe-atom nucleus are found in the steel The Fe-Ni atom cluster which consists of one Fe atom and two nearest neighbouring Ni atoms (2nnNi) is considered as the critical state of transformation to austenite The atom cluster of this type in the specimen quenched from α+γ region is more than that undergone conventional heat treatment The stable γ′ has yielded more abundant in the former than in the later Futhermore, the γ′-phase increases with the increase of tempering temperature because of the migration and enrichment of Ni atoms.
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