摘要
本文利用Gleeble—1500型热/力模拟机研究了锅炉用ASTM A290钢形变奥氏体的动态再结晶规律及组织变化特点。提出了一种新的数学处理方法直接求解热变形方程中的激活能(Q)等常数,得出A299钢的Q值为369.3 KJ·mol^(-1)。在此基础上给出了A299钢的动态再结晶图。试验发现,该钢奥氏体完全动态再结晶后的晶粒尺寸(d_(SS))与Zener-Hollomon参数间存在指数关系:d_(SS)=3.41×10~3×Z^(-0.165)。A299钢奥氏体形变后立即淬火时,发生形变促发铁素体转变的临界条件为Z=4×10^(15)S^(-1)。
The dynamic recrystallization (DRX) and strain induced austenite (A)→ferrite (F) transformation of steel ASTM A299 have been investigated with Gleeble-1500 thermal mechanical simulator. A new mathematical method is used to calculate the activation energy Q (369.3 kJ·mol^(-1)) and other hot deformation parameters, and the DRX disgram of steel A299 is given. It is found that the relationship between stable state grain size of austenite d_(ss) and Zener-Hollomon parameter Z obeys the power law d_(ss)=3.41×10~3×Z^(-0.165) and the A→F transformation is induced by the deformation of austenite, the critical condition for strain induced A→F transformation is Z=4×10^(13) s^(-1) when austenite is quenched immediately after deformation.
出处
《钢铁》
CAS
CSCD
北大核心
1992年第8期50-55,44,共7页
Iron and Steel
