为研究铈对低铬铁索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103 kJ/mol提高到114 kJ/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 steela 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 temperaturea was obsewed by optical microscope.The results ahow that static-recrystallization behavior is depressed, the temperature of static-recrystallization is enhanced and thus grain size refined for the ateel 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.
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