真空固溶处理316L不锈钢的电子背散射衍射分析

In order to discuss the mechanism of improving the properties of 316L stainless steel by vacuum solution treatment (VST), the variation of grain size, misorientation, low and high angle grain boundary, coincidence site lattice (CSL) grain boundary, recrystallization, texture and local misorientation of 316L stainless steel before and after vacuum solution treatment were analyzed by electron backscatter diffraction (EBSD). The results showed that after vacuum solution treatment, the grain size increased by 2.4 times; the proportion of 60 misorientation increased by 11.29% and the proportion of 40 misorientation decreased by 4.56%; the proportion of Σ3 twin boundary increased by 11.10%, the proportion of Σ9 and Σ27 boundary decreased by 2.38% and 0.78%; the proportion of recrystallized grains increased by 12.28%; The <101> texture ratio in Z0 direction did not change significantly, and the local misorientation decreased. The VST provided enough energy for the sample to promote grain growth through grain boundary migration. High energy grain boundary moves towards the direction of reducing interfacial energy during the migration process, and grain boundary character distribution was optimized. At the same time, the VST increased the proportion of recrystallized grains and reduced the ratio of deformed grains and the residual stress in the specimen.