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基于“高温单相处理、重度冷变形及双相区固溶处理”双相不锈钢的细匀化工艺获得了细小均匀的双相(α+γ)组织,借助光学显微镜(OM)、电子背散射衍射技术(EBSD)研究了固溶处理对细匀化工艺中显微组织演变的影响。结果表明:与“双相区变形+固溶处理”工艺相比,细匀化工艺组织中的γ相大多从α相的三叉晶界处析出,其沿变形方向的带状分布得到明显改善且两相的晶粒尺寸差异较小,均匀化程度显著提高;另外,在相同的固溶处理下,两种工艺中的两相比例基本相同。而在细匀化工艺中,γ相尺寸随加热温度的升高与保温时间的延长而增大;在1050~1150℃加热,保温10 min条件下,γ相的尺寸与加热温度之间呈线性关系;在1100℃加热,保温10~60 min条件下,γ相尺寸的立方与保温时间之间同样呈近线性关系。
The microstructure of the microstructure was characterized by means of optical microscope (OM), electron microscopy (OM), electron microscopy Backscattering Diffraction (EBSD) studies the effect of solution treatment on the microstructure evolution in a finely divided process. The results show that compared with the “two-phase zone deformation + solution treatment,” the γ phase in the finely-divided microstructure is mostly precipitated from the tricrystalline grain boundaries of the α-phase, and the ribbon distribution along the deformation direction is obviously Improved and the difference of the grain size of the two phases was small and the degree of homogenization was remarkably improved. In addition, the proportion of two phases in the two processes was basically the same under the same solution treatment. In the fine homogenization process, the γ phase size increases with the increase of heating temperature and holding time; under the conditions of heating and holding at 1050 ~ 1150 ℃ for 10 min, the size of γ phase is linear with the heating temperature The relationship between the cubic phase of γ phase and the holding time also shows a nearly linear relationship under the conditions of heating at 1100 ℃ for 10 ~ 60 min.