摘要
利用热模拟试验机研究了变形对Nb-Mo低碳钢奥氏体-铁素体等温相变动力学的影响。结果表明,形变缩短了相变孕育期,加速了奥氏体→铁素体的等温相变,细化了铁素体组织;在650℃出现了针状铁素体。按照Avram i方程,由试验数据回归得到875℃变形后在700℃和650℃奥氏体向铁素体等温相变的动力学方程。
Using thermal simulation tester,isothermal austenite to ferrite transformation kinetics for a low carbon Nb-Mo steel was studied under with and without hot deformation. The results show that the ferrite transformation is accelerated and ferrite grains are refined under hot deformation,because incubation period of the transformation is shortened by hot deformation, and acicular ferrite can be obtained at 650℃. Basing on Johnson-Mehl-Avrami equation,the kinetics equations of ferrite transformation in 0. 022C-0. 021Nb-0. 24Mo steel at isothermal temperatures of 650℃ and 700℃ ,can be obtained by regression of the experimental data.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2005年第12期61-65,共5页
Heat Treatment of Metals
基金
国家科技部"863"计划项目(2002AA302501)
关键词
Nb-Mo低碳钢
热变形
铁素体
等温相变
Nb-Mo low carbon steel
hot deformation
ferrite
isothermal transformation
