摘要
用 X— Y记录仪测定了低碳锰铌钢在稳恒磁场下的温降曲线 ,分析标定了奥氏体向铁素体转变的起始相变点 ,通过对空冷至不同温度后淬火试样金相显微组织的分析 ,研究了稳恒磁场对 γ→ α相变的影响。研究结果表明 :在奥氏体化后的空冷过程中加入稳恒磁场 ,可以提高奥氏体向铁素体相变的起始温度。随着磁通密度的增大 ,铁素体相变点也随着提高 ,而且铁素体晶粒得到了显著的细化 ;稳恒磁场下小幅度的冷却速度变化对铁素体相变点的影响不大 。
The temperature time diagram for low carbon Mn Nb steel at constant magnetic field was measured by X—Y recorder, and the beginning temperature of γ→α phase transformation was determined. The effect of magnetic field on γ→α phase transformation was studied by means of optical microstructure analysis for quenched specimens at different temperatures. The results showed that the heat treatment at magnetic field can raise the beginning temperature of γ→α phase transformation. With the increase of intensity of constant magnetic field, the beginning temperature of γ→α phase transformation also rise, and ferritic grain is refined significantly. The change of cooling rate has no effect on the temperature of γ→α phase transformation, but has obvious effect on the growth of ferritic grains.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2000年第5期31-35,共5页
Journal of Iron and Steel Research
基金
国家 973新一代钢铁材料重大基础研究项目 !(科 990 6 0 110 A)
关键词
稳恒磁场
低碳锰铌钢
γ→α相变
起始相变点
constant magnetic field
low carbon Mn Nb steel
beginning temperature of phase transformation
