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    • 95. 发明申请
    • DEVELOPMENT OF NANOSTRUCTURE AUSTEMPERED DUCTILE IRON WITH DUAL PHASE MICROSTRUCTURE
    • 具有双相微结构的纳米结构柔性铁氧体的研制
    • WO2014145421A2
    • 2014-09-18
    • PCT/US2014/030187
    • 2014-03-17
    • WAYNE STATE UNIVERSITY
    • PUTATUNDA, Susil K.
    • C22C37/10C21D1/00C21D1/19C21D1/20C21D5/00C21D2201/03C21D2211/002C22C33/08
    • A method for forming an austempered iron composition with a nanoscale microstructure includes a step of heating an iron-carbon-silicon alloy with silicon to a first temperature that is lower than A1 for the iron-carbon-silicon alloy. The iron-carbon-silicon alloy is then adiabatically deformed such that the temperature of the iron-carbon-silicon alloy rises to a second temperature which is sufficient to form proeutectoid ferrite and austenite. The iron-carbon-silicon alloy is cooled to a first austempering temperature. The iron-carbon-silicon alloy is then heated to a second austempering temperature that is greater than the first austempering temperature to form a dual phase microstructure. Characteristically, the dual phase microstructure includes proeutectoid ferrite and ausferrite.
    • 用于形成具有纳米尺度微结构的奥氏体铁组合物的方法包括将铁 - 碳 - 硅合金与硅加热至低于铁 - 碳 - 硅合金的A1的第一温度的步骤。 然后将铁 - 碳 - 硅合金绝热变形,使得铁 - 碳 - 硅合金的温度升至足以形成先共析铁素体和奥氏体的第二温度。 将铁 - 碳 - 硅合金冷却至第一奥氏体回火温度。 然后将铁 - 碳 - 硅合金加热至大于第一奥氏体回火温度的第二奥氏体回火温度以形成双相微结构。 特征上,双相微结构包括先共析铁素体和铁素体。