摘要
利用电子背散射衍射(EBSD)技术和H2SO4-Fe2(SO4)3腐蚀浸泡实验研究了304不锈钢经两种特定形变热处理工艺后晶界特征分布及其对合金晶间腐蚀性能的影响。结果表明,相比于轧制前的固溶状态,小形变量(5%)冷轧退火工艺能够显著提高合金中低重位(CSL)晶界的比例,使其由49%增加到75%,并且非共格的可动Σ3晶界在迁移过程中生成较多Σ9和Σ27晶界并与其构成特殊晶界团,有效地阻断了一般大角度晶界的网络连通性,改善合金的晶间腐蚀抗力;而大变形量(70%)冷轧试样在退火过程中发生了再结晶,晶粒长大过程中低Σ特殊晶界被迁移的大角度晶界吞噬,因此特殊晶界较少,一般大角度晶界相互贯通,腐蚀现象比较严重。
The grain boundary character distributions in three samples were treated by solid solution,grain boundary engineering（GBE） and recrystallization annealing,respectively,and analyzed using electron back scatter diffraction technique（EBSD）.The corrosion testing was also conducted upon the three samples in the boiling solution of H2SO4＋Fe2（SO4）3 and the surface and cross-section were observed by SEM.The results show that for the GBEed sample,the fraction of low Σ-CSL grain boundaries is highest among these samples,which hit the record of 75% or so.In addition,the connectivity of random high angle grain boundaries network is effectively disrupted,therefore good resistance to intergranular corrosion is obtained.
出处
《热加工工艺》
CSCD
北大核心
2011年第14期59-61,109,共4页
Hot Working Technology
关键词
304不锈钢
晶界特征分布
晶间腐蚀
304 stainless steels
grain boundary character distribution
intergranular corrosion
