Microstructure evolution of friction stir processed 2507 duplex stainless steel was investigated at rotational speed of 400 rpm and traverse speed of 100 mm/min. The microstructural evolution in processed zone was studied by optical microscopy and electron backscattered diffraction. Regions in the stir zone and the thermo-mechanically affected zone experienced different microstructure evolution due to different thermo-mechanical processes. The results showed that static recrystallization, dynamic recrystallization, and dynamic recovery occurred in the processed zone. And the ferrite was occurred the recrystallization prior to the austenite.

中文翻译：

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搅拌摩擦加工2507双相不锈钢组织演变

研究了搅拌摩擦处理的 2507 双相不锈钢在 400 rpm 转速和 100 mm/min 移动速度下的微观结构演变。通过光学显微镜和电子背散射衍射研究了加工区的微观结构演变。由于不同的热机械过程，搅拌区和热机械影响区中的区域经历了不同的微观结构演变。结果表明，加工区发生了静态再结晶、动态再结晶和动态恢复。铁素体先于奥氏体再结晶。