摘要
采用化学侵蚀、彩色金相显示和电子探针(EPMA)分析研究了304奥氏体不锈钢(%:0.08C、1.37Mn、0.62Si、17.77Cr、9.09Ni)2.0 mm连铸薄带内残留铁素体的形态和分布。结果表明,在薄带表层铁素体呈棒状,其间距≤20μm;在薄带柱状树枝晶区,铁素体位于一次枝晶臂和二次枝晶臂中心,铁素体二次枝晶间距≤10μm;在中心等轴晶区,残留铁素体形貌和分布与等轴晶区半固态形成机理有关。先凝固的固相颗粒内部铁素体为弯曲树枝状和网状形貌,固相颗粒间隙铁素体呈岛状形貌。
The morphology and distribution of retained ferrite in 304 austenite stainless steel （0. 08C, 1.37Mn, 0. 62Si, 17.77Cr, 9.09Ni） 2. 0 mm cast strip have been studied by chemical etching, colour metallurgraphy and electroprobe microanalyser （EPMA）. Results showed that the ferrite in strip surface area presented rod-like morphology and the space between rod was≤20 μm; in columnar dendrite area, the ferrite located at center of both primary and secondary dendrite arms and the space between ferrite secondary arms was ≤10≤m; in center of strip-equiaxed zone, the morphology and distribution of ferrite was related to semisolid formation mechanism of equiaxed grains. The ferrite in initially solidified solid-phase particles presented curved dendrite and netlike morphology, while the ferrite in inter-space of initially Solid-ified particles presented island morphology.
出处
《特殊钢》
北大核心
2008年第3期10-12,共3页
Special Steel
基金
国家自然科学基金(50434040)
