论文部分内容阅读
Analysis of χ phase precipitation in 2205 duplex stainless steel aged at 700 and 750 ℃ has been investigated systematically. The experimental results showed that χ phase forms prior to the precipitation of σ phase and disappears once σ phase starts to precipitate. This phenomenon indicates that σ phase nucleated and consumed the χ phase. The σ phase nucleated mainly at ferrite/austenite interface and grew inwards into the ferrite phase. The morphology of σ phase reveals a coral-like structure at the temperature of 700 ℃ for 120 min followed by quenching in water. The decomposition of ferrite occurs via the following eutectoid reaction: F→σ+γ2. The selected area diffraction pattern of zone axes is[ 1 ]χ||[ 1 ]δ, indicating a characteristic orientation relationship between χ phase and δ-ferrite.
Analysis of χ phase precipitation in 2205 duplex stainless steel aged at 700 and 750 ° C has been investigated systematically. The experimental results showed that χ phase forms prior to the precipitation of σ phase and disappears once σ phase starts to precipitate. This phenomenon indicates that σ The phase of nucleated and consumed the χ phase. The σ phase nucleated mainly at ferrite / austenite interface and grew inwards into the ferrite phase. The morphology of σ phase reveals a coral-like structure at the temperature of 700 ℃ for 120 min followed by quenching in water. The decomposition of ferrite occurs via the following eutectoid reaction: F → σ + γ2. The selected area diffraction pattern of zone axes is [1] χ || [1] δ, indicating a characteristic orientation relationship between χ phase and δ- ferrite.