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首页> 外文会议>THERMEC 2011;International conference on processing manufacturing of advanced materials >The Formation of Ultrafine Ferrite and Low Temperature Bainite Through Thermomechanical Processing
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The Formation of Ultrafine Ferrite and Low Temperature Bainite Through Thermomechanical Processing

机译：热机械加工形成超细铁素体和低温贝氏体

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In the current study, a novel approach was employed to produce a unique combination of ultrafine ferrite grains and low temperature bainite in a low carbon steel with a high hardenability. The thermomechanical route included warm deformation of supercooled austenite followed by reheating in the ferrite region and then cooling to bainitic transformation regime (i.e. 400-250°C). The resultant microstructure was ultrafine ferrite grains (i.e. <4μm) and very fine bainite consisting of bainitic ferrite laths with high dislocation density and retained austenite films. This microstructure offers a unique combination of ultimate tensile strength and elongation due to the presence of ductile fine ferrite grains and hard low temperature bainitic ferrite laths with retained austenite films. The microstructural characteristics of bainite were studied using optical microscopy in conjunction with scanning and transmission electron microscopy techniques.
机译：在当前的研究中，采用一种新颖的方法在具有高淬透性的低碳钢中生产超细铁素体晶粒和低温贝氏体的独特组合。热机械路径包括过冷奥氏体的热变形，然后在铁素体区域中再加热，然后冷却至贝氏体转变状态（即400-250℃）。产生的显微组织是超细铁素体晶粒（即<4μm）和非常细的贝氏体，由高位错密度的贝氏体铁素体板条和残留的奥氏体膜组成。由于存在延展性细铁素体晶粒和坚硬的低温贝氏体铁素体板条，并保留了奥氏体，因此这种微结构提供了极限抗拉强度和伸长率的独特组合。贝氏体的显微结构特征是使用光学显微镜结合扫描和透射电子显微镜技术研究的。

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