摘要
为研究铈对低铬铁素体不锈钢的静态再结晶行为的影响,冶炼含铈和不含铈的00Cr12不锈钢,在Gleeble-3800型热模拟试验机上采用双道次压缩法,测量不同温度下、不同道次间隔时间试验钢的应力应变曲线,计算再结晶体积分数,评价材料静态再结晶行为;对试验钢在不同温度下退火,侵蚀后进行组织观察。结果表明:铈的添加可抑制试验钢静态再结晶的进行,提高试验钢的再结晶温度,细化晶粒,铈含量0.028wt%时可将00Cr12不锈钢的静态再结晶激活能由103kJ/mol提高到114kJ/mol。铈在晶界的偏聚,对晶界起到拖拽作用,降低了晶界迁移速度,从而抑制了静态再结晶行为。
00Cr12 ferritic stainless steels with and without cerium were prepared and the effect of cerium on static-recrystallization behavior of the low chromium ferritic stainless steels was investigated. The stress-strain curves of the steels were tested at different temperatures with different interval time between passes on a Gleeble-3800 thermo-mechanical simulator by double-hit hot compression method, and the rates of recrystallization were calculated according to the tested stress-strain curves. Microstructure of the steels annealed at different temperatures was observed by optical microscope. The results show that static-recrystallization behavior is depressed, the temperature of static-recrystallization is enhanced and thus grain size refined for the steel with addition of cerium. The value of static-recrystallization activation energy is raised from 103 kJ/mol to 114 kJ/mol for the steel with 0.028wt% of cerium. The migration velocity of grain boundary decreases as the result of the segregation of cerium on grain boundary, leading the depression of static-recrystallization process in the low chromium ferritic stainless steel.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第3期64-68,共5页
Transactions of Materials and Heat Treatment
关键词
铁素体不锈钢
铈
静态再结晶
激活能
ferritic stainless steel
cerium
static-recrystallization
activation energy