利用共聚焦激光扫描显微镜原位观察不同冷却速度下双相不锈钢中高温铁素体(δ)向奥氏体(γ)转变的全过程.结果表明,冷却速度较高时,γ优先在δ晶界上析出并迅速向δ内部长大,其形状以针状为主;冷却速度较低时,γ优先在δ晶界上析出,呈片状,γ端面在向δ内部长大的同时,其侧面也不断长大,相变过程中伴随着δ晶界的迁移.利用固态相变形核理论和扩散控制长大理论分析讨论了不同冷却速度下δ→γ的相变行为.
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