微纳结构贝氏体钢由微纳结构贝氏体铁素体和残留奥氏体组成,具有超高强度和高塑性.如何细化块状残留奥氏体并提高薄膜状残留奥氏体含量,来实现精细组织和优良塑韧性,成为重要的科学与技术问题.本文综述了合金元素和热处理工艺等因素对贝氏体转变及其对残留奥氏体形成与形态的影响,分析了残留奥氏体在超高强韧贝氏体钢中的塑韧化机理,从而为开发超高强度高韧性的贝氏体钢提供理论与技术指导.
Micro/nano-structured bainitic steels have a unique combination of ultra-high strength and high ductility due to their ultrafine structure consisting of bainitic-ferrite and retained austenite.It has become an important scientific and technical problem that how to refine the block retained austenite and increase the content of film-like retained austenite to achieve fine microstructure and excellent ductility and toughness.In this paper,the effects of alloying elements and heat treatment processes on bainite transformation and the formation and morphology of retained austenite are reviewed.Plastic toughening mechanism of residual austenite in ultra-high strength and toughness of bainitic steel is analyzed,and thus for the development of ultra-high strength and high toughness bainitic steel.
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