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利用扫描电镜及能谱分析研究了Fe-7.8%Cu和Fe-2.1%Cu两种合金不同温度下铜的析出分布规律,以及合金中MnS夹杂物对铜析出的影响.部分试样加热到1600℃保温20 min后直接淬火得到;其他试样1 600℃保温20 min,炉冷到特定温度再保温20 min后淬火得到.结果表明:Fe-7.8%Cu合金在1600℃下淬火,含铜相在晶界、晶内均有析出;在1200℃下淬火,含铜相沿晶界析出;而1000℃淬火则有较大尺寸的ε-Cu相沿晶界析出.Fe-2.1%Cu合金在1 600℃和1 000℃下淬火,含铜相都沿晶界析出;而800℃淬火ε-Cu相在晶内析出.合金中MnS夹杂可以作为铜析出的有效形核核心.
Scanning electron microscopy and energy spectrum analysis of Fe-7.8% Cu and Fe-2.1% Cu two kinds of copper precipitation under different temperature distribution and the impact of MnS inclusions on the precipitation of copper alloy part of the sample was heated to 1600 ℃ for 20 min and then quenched directly.The other samples were held at 600 ℃ for 20 min and quenched after the furnace was cooled to a specific temperature for 20 min and then annealed.The results show that the quenched Fe-7.8% Cu alloy at 1600 ℃, In the grain boundary, the grain is precipitated in the grain; when it is quenched at 1200 ℃, the copper-containing phase precipitates along the grain boundary; while the larger size of ε-Cu phase precipitates along the grain boundary when quenched at 1000 ℃ .Fe- ℃ and 1000 ℃, all the copper-containing phases are precipitated along the grain boundaries, and the ε-Cu phase precipitates in the crystal at 800 ℃ .The MnS inclusions in the alloy can be used as effective nucleation sites for copper precipitation.