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首页> 外文期刊>Advanced Experimental Mechanics >Cast Structure and Soundness of Multilayer Al-Si Alloy Pipes Produced by Two-Step Centrifugal Casting
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Cast Structure and Soundness of Multilayer Al-Si Alloy Pipes Produced by Two-Step Centrifugal Casting

机译：两步离心铸造生产多层铝硅合金管的铸造结构和可靠性

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摘要

Solidification structures and casting soundness of multilayer Al-Si alloy pipes produced by a two-step centrifugal casting process have been investigated. Two kinds of molten metals, i.e. , the first melt (Al-12mass%Si or Al-14mass%Si alloy) and the second melt (Al-32mass%Si-0.1mass%P alloy) having a higher liquidus temperature were cast in sequence into a vertical centrifugal caster. The second melt was cast after the solidified shell of the first melt had grown partway from the contact surface with the mold. The cast pipe specimens were typically composed of three layers. The outer layer was the surviving part of the solidified shell of the first melt after contact with the second melt cast at a high temperature. The intermediate layer was derived from the molten or partially-molten part of the first melt. The inner layer had a hypereutectic structure containing fine primary silicon crystals originated in the second melt. The integrated length of crack-like defects at the boundary between the intermediate and inner layers varied depending on the growth degree and structure of the solidified shell of the first melt.
机译：研究了通过两步离心铸造工艺生产的多层铝硅合金管的凝固组织和铸造稳定性。两种熔融金属，即将具有较高液相线温度的第一熔体（Al-12质量％Si或Al-14质量％Si合金）和第二熔体（Al-32质量％Si-0.1质量％P合金）依次浇铸到立式离心铸造机中。在第一熔体的固化壳从与模具的接触表面的一部分生长之后，浇铸第二熔体。铸管样品通常由三层组成。在高温下与第二熔体接触之后，外层是第一熔体的凝固壳的幸存部分。中间层源自第一熔体的熔融或部分熔融的部分。内层具有过共晶结构，该过共晶结构包含源自第二熔体的精细初级硅晶体。中间层和内层之间的边界处的裂纹状缺陷的总长度根据第一熔体的凝固壳的生长程度和结构而变化。

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