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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 effects of the grain boundary distribution and the intergranular corrosion resistance of the 304 stainless steel after two specific heat treatment processes were studied by electron backscatter diffraction (EBSD) and H2SO4-Fe2 (SO4) 3 corrosion immersion experiments. The results show that the small deformation (5%) cold rolling anneal can significantly increase the proportion of low-heavy-grain (CSL) grain boundaries, from 49% to 75% compared with that before rolling. And the non-coherent movable Σ3 grain boundaries generate more Σ9 and Σ27 grain boundaries during migration and form special grain boundaries with them, effectively blocking the network connectivity of the general large-angle grain boundaries and improving the intergranular Corrosion resistance. However, the large deformation (70%) cold-rolled specimens recrystallize during the annealing process, and the low-Σ special grain boundaries are swallowed at the high-angle grain boundaries during the grain growth. Therefore, there are fewer special grain boundaries , The general large-angle grain boundary interpenetrated, the corrosion phenomenon is more serious.