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一、引言 在各种文献及教材中关于珠光体转变已讨论得很多,虽然个别问题还有些争论,但总体来说似乎已近成熟。对珠光体转变的各种行为用扩散相变理论能较完好地予以说明,因此早已被人们所接受。近年来我们在探讨冷却方式对奥氏体状态的影响时,发现奥氏体在向珠光体转变过程中,过冷奥氏体内碳以层片结构进行了分布,并且珠光体就在此基础上形成并长大。这种现象用传统的扩散相变理论尚难以说明,因此需对珠光体转变孕育期的本质和转变机制进行新的探讨。
I. INTRODUCTION Much has been discussed about the transformation of pearlite in various documents and teaching materials. Although there are some controversies on individual issues, on the whole it seems almost mature. The behavior of pearlite transformation with the theory of diffusion and phase transition can be more fully explained, it has long been accepted. In recent years, we discuss the impact of cooling mode on the state of austenite and found austenite in the transformation to the pearlite, carbon in the supercooled austenite layer structure distribution, and pearlite on this basis Formed and grew up. This phenomenon is difficult to explain with the traditional theory of diffusion and phase transformation. Therefore, a new discussion is needed on the essence and mechanism of the transformation of pearlite.