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为了确定薄带连铸AISI304不锈钢凝固过程中残留铁素体的生成及转变行为,采用彩色金相、电解侵蚀、电子背散射衍射分析技术及X射线衍射分析等研究手段对双辊薄带连铸AISI304不锈钢凝固组织及残留铁素体特征进行了研究.结果表明AISI304不锈钢薄带的凝固组织由表层胞状晶区、中间柱状晶区和中心等轴晶区三部分组成.薄带表层胞状晶区内残留铁素体呈棒状,柱状晶区的残留铁素体形态为鱼骨状,中心等轴晶区的残留铁素体呈弯曲的树枝状;薄带的表层胞状晶区残留铁素体的质量分数为4.6%～6.6%,柱状晶区内的残留铁素体质量分数为3.6%～3.7%,中心等轴晶区内的残留铁素体质量分数为11.27%～11.34%;残留铁素体沿着厚度方向呈现“W”状分布.
In order to confirm the formation and transformation of residual ferrite during the solidification process of AISI 304 stainless steel strip continuous casting, the effects of color metallography, electrolytic erosion, electron backscatter diffraction analysis and X-ray diffraction analysis were studied. AISI 304 stainless steel solidification and residual ferrite characteristics were studied.The results show that AISI304 stainless steel strip solidification organization from the surface of the cell crystal zone, the middle columnar zone and the central equiaxed zone composed of three parts. The residual ferrite is rod-shaped, the residual ferrite in the columnar zone is fishbone, and the residual ferrite in the equiaxed zone is bent dendrites. The residual ferrite mass in the surface zone of the ribbon The fractional ferrite content is 4.6% -6.6%, the residual ferrite content in the columnar crystal region is 3.6% -3.7%, and the residual ferrite content in the equiaxed central region is 11.27% -11.34%. The residual ferrite Along the thickness of the “” W shape distribution.