【摘要】 详尽地探讨了铁合金中奥氏体发生"相内分解"的可能性,以及碳原子的集析在低碳马氏体相变中的重要作用。提出"小角界面束状机制",以阐明低碳马氏体的形成。对低碳淬火钢中,为什么薄板晶的厚度相近,各薄板晶之间为何生成厚度基本相同的残留奥氏体薄膜,在块区内的板状晶为什么是K-S关系和N-W关系交替出现,各板状晶相互间的取向差为何是小角差,而相邻块区之间成孪晶关系,以及低碳马氏体的显微组织特征等问题进行了全面的解释。论证了在低碳马氏体相变过程中的确需要依靠"相内分解",在高碳奥氏体旁边形成低碳区,通过改变薄板晶的晶体取向来降低系统应变能。更多还原

【Abstract】 The possibility of"inner decomposition of phase"of austenite in ferroalloy and the vital function of the collection of carbon atoms in low carbon martensite transformation were discussed in details."The small angle interface packet mechanism"is proposed to clarify the formation of low carbon martensite,which could thoroughly explain the similar thickness of thin sheet crystals in packet thin sheet martensite and residual austenite film between thin sheet crystals,alternate of the K-S relationship and the N-W relationship in the sheet-like crystal,small angle mutual misorientation of each sheet-like crystal,twin relationship between block regions as well as the microstructure characteristic of low carbon martensite.It is demonstrated that the reduce of the strain energy of ferroalloy can be attributed to the change of the crystal orientation of thin sheet crystals,which formed by"the inner decomposition of phase"during low carbon martensite transformation and existed in the low carbon region nearby the high carbon martensite.更多还原