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R.L. Zuo , L. Fang and P. D. Ding(Department of Metallurgy and Materials Engineering , Chongqing University , Chongqing 630044 , China)
金属学报(英文版)
The upper bainite formed isothermally at 480℃ C in Fe-0. 38C-1. 73Si alloy was studied by using transmission electron microscopy (TEM). It was found by electron diffraction and crystallographic analysis that bainitic carbide precipitation originated from bainitic ferrite (BF), in which the initial supersaturation did not come up to the average carbon content of the alloy. It is suggested that bainite transformation in steel should be a coupled process of transformation dislocation movement controlled by carbon diffusion in austenite.
关键词: : bainite , null , null , null
武小雷 , 张喜燕 , 康沫狂 , 杨延清
金属学报
对Ｆｅ－Ｃ合金贝氏体在奥氏体贫碳区形成机制进行了热力学分析．结果表明，贝氏体相变驱动力随奥氏体贫碳区含碳量的降低而增加；在Ｂｓ温度，贝氏体临界相变驱动力（绝对值）为４７０─１２００Ｊ／ｍｏｌ，随合金含碳量的增加而增加；贝氏体铁素体初始含碳量为部分过饱和碳，其过饱和程度随相变温度的降低而增加，且相变驱动力亦相应升高．在整个贝氏体转变温区，初期贝氏体在奥氏体贫碳区马氏体式切变形成具有热力学可能性．
关键词: 贝氏体 , carbon-depleted region , shear transformation , thermodynamic
