• 제목/요약/키워드: 급속응고분말

검색결과 63건 처리시간 0.02초

급속응고된 금속분말의 응고거동 및 제조법에 관한 연구;Part I : 급속응고 제조법 (Solidification Behaviors of the Rapidly Solidified Metallic Powders and Development of the Powder Making Process.;Part I : Development of the Powder Making Process)

  • 김종윤;윤우영
    • 한국주조공학회지
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    • 제15권2호
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    • pp.164-174
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    • 1995

  • New metallic powder making processes, named "Centrifugal Emulsification Process(CEP)" and "Mixer and Settler(MS)" have been developed to synthesize rapid solidified metallic powders. Through CEP and MS processings, the high temperature metals as well as the low temperature alloys are manufactured. Also, the effects of rapid solidification on the undercooling, solidification rate and crystallization behaviors can be evaluated effectively through the processes. The standard deviations of the synthesized typical Pb-Sn eutectic powders are 1.63 and 1.51 for CEP and MS respectively, and the average size of the MS powders was $18{\mu}m$. The possibility of the customized not only size and shape control but microstructure control was also shown. Both of the new methods can be applied to continuous powder making processes.

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급속응고된 Al-8wt%Fe 합금의 미세조직 및 고온강도 (Microstructure and High Temperature Strength of Rapidly Solidified Al-8wt%Fe Alloy)

  • 최병준
    • 한국분말재료학회지
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    • 제5권3호
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    • pp.192-198
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    • 1998

  • Microstructure and mechanical properties were examined on rapidly solidified Al-8wt%Fe alloy. High temperature strength test was also undertaken, and it is shown that the refinement in microstructure resulting from extremely rapid cooling rates gives rise to improved high temperature strength, but the elongation to fracture of this material decreases with increasing temperature, particularly in the temperature range up to 30$0^{\circ}C$. Specimens heat-treated for 100 hrs were analyzed with TEM micrographs to understand the thermal stability of this material.

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급속응고 Al-Si계 합금의 단조공정에 대한 유한요소 해석 (Finite Element Analysis for Forging Processes of Rapidly Solidified Al-Si Alloys)

  • 손현택
    • 한국분말재료학회지
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    • 제5권1호
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    • pp.57-63
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    • 1998

  • The densification behaviors of rapidly solidified Al-Si alloys under high temperature processing were investigated. In general, it was difficult to establish optimum process variables for forging condition through experimentation, because this was costly and time consuming. In this paper, to overcome these problems, we compared the experimental result to the finite element analysis for forging processes of rapidly solidified Al-Si alloys. The results of these simulations helped understand the distribution of relative density during various forging processes. This information is expected to assist in improving rapidly solidified Al-Si alloys forging operations.

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