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本文分析了功率降低法因不同合金定向效果不同的原因,以及通过整枝技术获得合理显微组织的方法。 试验结果表明,合金的固—液温度间隔越大,造成发达的侧枝,使主干密度降低,同时使初生相粗化,不利于提高定向合金的性能。使定向合金在固—液温度范围内保温并快速冷却可增加上干密度,整去粗大的侧枝,细化初生相,改善了合金的枝晶间状态。
This paper analyzes the reasons for the different power reduction methods for different directional effects of the alloy and the method of obtaining reasonable microstructure by the pruning technique. The experimental results show that the larger the solid-liquid temperature interval of the alloy, the more developed side branches, the lower the trunk density and the coarsening of the primary phase are not conducive to the improvement of the performance of the directional alloy. The orientation of the alloy in the solid - liquid temperature range of insulation and rapid cooling can increase the dry density, finishing the coarse side branches, fine primary phase, improve the interdendritic alloy state.