评刘宗昌等《贝氏体铁素体的形核》一文  

Comment on the paper 《Study on nucleation of bainite ferrite》 authored by LIU Zong-chang et.al

作　　者：徐祖耀[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240

出　　处：《材料热处理学报》2012年第2期158-160,共3页Transactions of Materials and Heat Treatment

摘　　要：刘文中,关于贝氏体形成机制,包括形核过程的文献很少被引述。作者(刘等)的主要论点为贝氏体铁素体以无扩散、非切变机制在奥氏体内贫碳区形核,并未引述形成贫碳区的必要条件。本文作者强调,在钢及铜合金中,不可能由Spinodal分解和位错偏聚形成贫溶质区。刘等的理念未得到先进理论观点和精细实验结果的支持。在刘文中,据此对临界核心大小和形核能的计算并无显著意义,期望青年学者对贝氏体相变机制作进一步研究。Only few literatures concerning bainite formation containing nucleation process were cited in Liu＇s paper.There is no detailed elucidation of the main point of view of the authors Liu et.al,i.e.the bainite ferrite nucleates at carbon depleted zone in austenite with nondiffusion,non-shear mechanism and the required condition for the formation of carbon-depleted zone.The present author emphasizes that it is impossible to develop solute-depleted zone during the formation of bainite in steels and Cu-alloys through Spinodal decomposition or by segregation of dislocation.It seems that the main point suggested by Liu et.al has been supported neither by advanced theoretical consideration nor by precise experimental result.Accordingly,the calculation of critical nucleus size and nucleation energy in Liu et.al＇s paper has no significant meaning.Young scientists are encouraged to take further studies on transformation mechanism of bainite.

关 键 词：贝氏体形核 扩散机制 切变机制 贫碳区 

分 类 号：TG111.5[金属学及工艺—物理冶金]