综述了核能系统用纳米增强铁基合金成相机制,阐述了机械球磨过程中形成的超细晶在后续热压烧结过程中发生的长大和粗化行为,介绍了纳米增强相的存在形式与形成过程,分析了奥氏体转变时动力学问题,对比了界面推进的指前因子和激活能等重要参数,提出了MgAl2O4原位增强铁基合金的方法,并展望了该材料的应用前景,总结了其成相机制和工程应用方面存在的问题.
In this paper, the phase transformation mechanism of the nano-phase strengthened Fe-based alloys used in nuclear field was introduced. The formation of ultrafine bcc grains during mechanical milling ( MM) and the growth and coarsening behavior in the subsequent hot isostatic pressing ( HIP ) process are clarified. The existence form and formation mechanism of nano-reinforcements are discussed. Austenitization kinetics are analyzed through the contrastive analysis of pre-exponential factor and activation energy. The strengthening method of iron-based alloys by in-situ formation of MgAl2 O4 is proposed. The future application development of the Fe-based alloys is prospected and the existing problems in the phase transformation mechanism and the engineering application are summarized.
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