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首页> 外文会议>EPD congress 2004 >MICROSTRUCTURE ANALYSIS OF ZA ALLOY ROD DIRECTIONALLY SOLIDIFIED BY HEATED MOLD CONTINUOUS CASTING
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MICROSTRUCTURE ANALYSIS OF ZA ALLOY ROD DIRECTIONALLY SOLIDIFIED BY HEATED MOLD CONTINUOUS CASTING

机译：连铸结晶凝固ZA合金棒的组织结构分析。

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摘要

The as-cast and heat treatment microstructure of ZA alloy rod directionally solidified by continuous casting has been analyzed. The results show that the microstructure of the ZA alloy line is the parallel directional dendritic columnar crystal. Each dendritic crystal of eutectic alloy ZA5 is composed of many layer eutectic ? and phases. The microstructure of hyper eutectic ZA alloys is primary dendritic crystal and interdendritic eutectic structure. The primary phase of ZA8 and ZA12 is ? phase, while the primary phase of ZA22 and ZA27 is phase. The technique of heated mold continuous casting, that is OCC, was invented by Ohno A[1-3]. The main difference between this method and traditional continuous casting is that it have changed the cooling mold of traditional continuous casting into the heated mold, to avoid the surface solidification of molten metal on the inner mold. During the solidification of heated mold continuous technique, heat of molten metal transfers alone the one dimension of solidified solid phase to form the directional solidified condition. The solidified structure of casting is determined by the heat and quantity transfer and the composition of alloy together. Having entered into the stable growth stage of crystal, only the crystal with a parallel direction to heat flow can growth well. Therefore, the rod made by heated mold continuous casting is the directional continuous columnar structure. Alloy composition determines the solidification structure and the forming tendency of phase structure. The alloy with a different composition has a different solidification character. The microstructure of alloys with a columnar structure but different composition has an obvious difference. Hence, authors have observed and analyzed the structure of heated mold continuous casting ZA alloy rod in order to find an effect method to increase the properties of ZA alloy.
机译：分析了通过连续铸造定向凝固的ZA合金棒的铸态和热处理组织。结果表明，ZA合金线的显微组织为平行取向的树枝状柱状晶体。共晶合金ZA5的每个树枝状晶体都由多层共晶组成。和阶段。过共晶ZA合金的微观结构是初生枝晶和枝晶间共晶结构。 ZA8和ZA12的初级相为？相，而ZA22和ZA27的主要相是相。 Ohno A [1-3]发明了加热结晶器连续铸造技术，即OCC。此方法与传统连铸之间的主要区别在于，它已将传统连铸的冷却模具更改为加热模具，从而避免了熔融金属在内模具上的表面凝固。在加热的模具连续技术的凝固过程中，熔融金属的热量仅传递凝固固相的一维，从而形成定向凝固状态。铸件的凝固组织取决于热量和热量的传递以及合金的成分。进入晶体的稳定生长阶段后，只有与热流方向平行的晶体才能生长良好。因此，通过加热模具连续铸造制成的棒是定向连续柱状结构。合金成分决定了凝固组织和相结构的形成趋势。具有不同组成的合金具有不同的凝固特性。具有柱状结构但组成不同的合金的显微组织具有明显的差异。因此，作者已经观察并分析了加热结晶器连铸ZA合金棒的组织，以找到提高ZA合金性能的有效方法。

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