Table 2. Tensile Properties Solutionizing at 450C (842F) 表2：450C (842F)固溶状态的拉伸性能
Yield Strength (MPa) 屈服强度（MPA）
L1 L2 L3 L4 L5 C1 C2 C3 C4 R1 R2 R3 E1
155 154 159 161 163 162 158 161 168 170 165 165 165
Ultimate Tensile Strength (MPa) 最终拉伸强度(MPa)
189 186 192 195 201 199 177 193 197 194 191 193 189
into the riser. Direct pour is particularly suited to the blade because the liquid metal drop under the filter is moderate (2 in. [50 mm]).
Comparisons Te pouring temperature was adjusted so the predicted
temperature of the liquid metal front during filling would never reach a temperature below the liquidus temperature of aluminum A356 (1,135F [613C]). A pouring temperature of 1,364F (740C) with a 25-second fill time was set for the conventional gating, and a corresponding temperature of 1,274F (690C) with a 10-second fill time was set for the direct pour arrangement. Filling with the conventional gating is shown in Fig. 4; a
corresponding sketch for the direct pour filling is shown in Fig. 5. Tese two modeled fillings show conventional gating loses more superheat during filling due to heat losses in the runners and gates and due to its slower pouring rate. The direct poured blade solidified slightly faster
because of the lower pouring temperature. The thin edge of the blades solidified in about two minutes, while the
比较
通过调节浇注温度，金属液在充型过程中的预测 温度不会低于铝A356的液相线温度（1,135F[613℃] ）。传统的浇注系统充型时间是25秒，浇注温度为 1,364F（740℃），而直接浇注的充型时间为10秒，相 应的浇注温度为1,274F（690℃）。
图4为传统浇注系统充型时的模拟图，图 5是直接浇 注的模拟图。这两个模拟图表明，传统浇注系统在充型 中因其在浇道中产生热损失和较慢的充型速率而损失更 多的热量。
由于浇注温度较低，直接浇注的叶片凝固速度略快。 叶片的薄边大约在两分钟内凝固，而铸件的厚端在20分 钟内凝固。
铸件在L，C和E位置的微观结构比较（如图6所示） 。枝晶间隙在这三个位置几乎是相同的;但是：
EIongation (%) 延伸率
2.5
2.05 2.35 3.5 4.1 2.2 1.9 2.1 3.2
2.25 2.25 2.15 2.25
Quality Index (MPa) 质量指数
249 233 247 277 293 251 218 241 272 247 244 243 242
Fig. 4. Modeled filling with the conventional gating is illustrated. 图4：传统浇注系统充型模拟图
Fig. 5. Modeled filling using the direct pour cup is illustrated. 图5：直接浇注系统充型模拟图
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION December 2014
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