az91铸造失误及合金流动性的数值模拟预测

A. Petrova, V. Bazhenov, A. Koltygin
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Above the liquidus temperature the interfacial heat transfer coefficient IHTCL = 1500 W/(m2 ·K) at pouring temperatures 670 and 740 °С and IHTCL = 1800 W/(m2 ·K) at pouring temperature 810 °С. Below the solidus temperature the interfacial heat transfer coefficient IHTCS = 600 W/(m2 ·K). We also determined the critical solid fraction of ML5 (AZ91) magnesium alloy for the casting made in the furan bonded sand mold (at a cooling rate ~2 K/s) and it was 0.1–0.15. We compared the simulated misruns position and the experimental misrun position in the «Protective cup» casting produced from the ML5 (AZ91) alloy into the sand mold with furan binder. The value of the critical solid fraction was clarified. 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引用次数: 0

摘要

镁合金薄壁铸件失稳形成的预测是铸造行业的一项重要任务。铸造过程的计算机模拟可以解决这一问题。合理的模拟结果要求在较宽的温度范围内合金和模具的热性能、铸件与模具之间的界面传热系数值以及合金在模具中流动被阻塞的临界固相分数正确。采用呋喃粘结剂测定了镁合金ML5 (AZ91)与砂型之间的界面传热系数。将模拟的螺旋试验长度与相同条件下的实验螺旋试验长度进行比较。在液相温度以上,浇注温度670°和740°С时界面换热系数IHTCL = 1500 W/(m2·K),浇注温度810°С时界面换热系数IHTCL = 1800 W/(m2·K)。在固相温度以下,界面换热系数IHTCS = 600 W/(m2·K)。在冷却速度~2 K/s的情况下,确定了呋喃粘接砂型铸造用ML5 (AZ91)镁合金的临界固相分数为0.1 ~ 0.15。用呋喃粘结剂对ML5 (AZ91)合金生产的“保护杯”铸件在砂型内的模拟失稳位置和实验失稳位置进行了比较。澄清了临界固相分数的取值。浇注温度分别为630℃和670℃,临界固相分数均为0.1。
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PREDICTION OF AZ91 CASTING MISRUNS AND ALLOY FLUIDITY USING NUMERICAL SIMULATION
Prediction of the misrun formation in thin-walled castings of magnesium alloys is a crucial task for foundry. The computer simulation of the casting processes can be used to solve this problem. A reasonable simulation results requires the correct thermal properties of the alloy and the mold over a wide range of temperatures and the value of interfacial heat transfer coefficient between the casting and the mold, and the critical solid fraction at which the alloy flow in the mold is choked off. In this paper we determine the interfacial heat transfer coefficient between the magnesium alloy ML5 (AZ91) and the sand mold with a furan binder. It was done by the comparing the simulated spiral test lengths with the experimental spiral test lengths obtained under the same conditions. Above the liquidus temperature the interfacial heat transfer coefficient IHTCL = 1500 W/(m2 ·K) at pouring temperatures 670 and 740 °С and IHTCL = 1800 W/(m2 ·K) at pouring temperature 810 °С. Below the solidus temperature the interfacial heat transfer coefficient IHTCS = 600 W/(m2 ·K). We also determined the critical solid fraction of ML5 (AZ91) magnesium alloy for the casting made in the furan bonded sand mold (at a cooling rate ~2 K/s) and it was 0.1–0.15. We compared the simulated misruns position and the experimental misrun position in the «Protective cup» casting produced from the ML5 (AZ91) alloy into the sand mold with furan binder. The value of the critical solid fraction was clarified. The castings were made at pouring temperatures 630 and 670 °C, and the critical solid fraction was 0.1 in both cases.
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