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一前言自本世纪初期,贝茵提出上、下贝菌体以来,各学派一直围绕贝茵体相转变机制问题进行激烈的争论。到目前为止,争论的主要问题仍然是:(1)什么是贝茵体,相变开始时它是否是过饱和固溶体:(2)贝茵体中的铁素体是以什么机制形核和长大的;(3)碳化物
I. INTRODUCTION Since the beginning of this century, when Primordial and Pelterophyllida were introduced by the Primordialists, various schools of thought have been engaged in heated debates over the transformation mechanism of the Bel? So far, the main issues of the debate are still: (1) what is a bainite, whether it is supersaturated solid solution at the onset of phase transformation: (2) what mechanism is nucleated and long Large; (3) Carbide