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金属学报  2012 

超快速退火下超低碳钢的再结晶行为研究

DOI: 10.3724/SP.J.1037.2012.00115, PP. 1057-1066

Keywords: 超低碳钢,超快速退火,再结晶,组织,织构

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Abstract:

对2种冷轧超低碳钢(Nb+Ti-IF钢和高Nb-IF钢)进行了再结晶退火实验,对比研究了2种钢在超快速退火(加热速率约为300℃/s)下的再结晶组织和织构特征.结果表明,在超快速退火工艺下,含C和Nb量较高的Nb-IF钢再结晶平均晶粒尺寸与普通退火工艺下无明显差别(均为(11.0±0.3)μm),再结晶织构峰值{223}的取向密度由普通退火工艺下的23.9降低到18.0,且织构类型分散.分析表明,较高的C和Nb含量在超快速退火工艺下推迟再结晶的发生,提高再结晶温度,增加了其非γ取向形核所占比率,恶化//ND取向织构,是其织构强度减弱的原因.在超快速退火工艺下,再结晶平均晶粒尺寸是否细化是高形核密度、极短的长大时间的晶粒细化效应与高晶界迁移速率的晶粒粗化效应相互竞争的结果,极大变形量和细晶作用产生的高形核密度造成形核点饱和,降低了超快速退火相对于普通退火工艺的晶粒细化效应,是晶粒细化不明显的主要因素.

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