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真空條件下錠模參數對鐵鎳合金縮孔分布的影響

Effect of molding parameters on porosity distribution in Fe-Ni alloy ingots under vacuum circumstance

  • 摘要: 為了減輕鑄件頂部縮孔缺陷以降低冒頭切除率提高鑄錠成材率,基于ProCAST軟件建立了鐵鎳合金真空下凝固數值仿真模型,通過解剖實驗驗證了模擬參數正確性,進而研究錠模參數對鐵鎳合金縮孔縮松分布的影響并得到最優錠型.研究表明:數值模擬中,關于真空條件下傳熱參數的設置較為合理,能較準確地模擬得到與實際生產一致的縮孔缺陷;在本研究條件下,冒口錐度對縮孔高度方向上位置的影響遠大于錠身錐度和高徑比對其的影響,縮孔位置隨冒口錐度減小上移,中心疏松程度隨錠身錐度增加而減弱,高徑比對縮孔縮松影響不大;優化后的錠型能有效改善縮孔缺陷,將縮孔控制在冒口線以上提高鑄錠成材率.

     

    Abstract: To reduce shrinkage cavity defects in Fe-Ni alloy ingots,a numerical simulation model was established by using the finite element software ProCAST. The simulation parameters were verified by anatomical experiment. The effect of molding parameters on porosity distribution in Fe-Ni alloy ingots was investigated and an optimized ingot was obtained. It is found that the parameter setting of heat transfer under vacuum circumstance is relatively reasonable,and the simulation results produce a good fit...

     

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