变质的a357合金的传热与凝固行为_外文翻译.zip
变质的a357合金的传热与凝固行为_外文翻译,翻译共八页 英翻中heat transfer and solidification behaviour of modified a357 alloyal╟si alloys are subjected to melt treatment like modification to improve their mechan...
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翻译共八页 英翻中
Heat transfer and solidification behaviour of modified A357 alloy
Al–Si alloys are subjected to melt treatment like modification to improve their mechanical properties. Non-destructive technique like thermalanalysis is generally used to assess the effectiveness of melt treatment. In the present study, the behaviour of the melt treated Al–7Si–Mg alloy(A357) during solidification with or without chilling was investigated using thermal analysis. Thermal analysis and heat transfer parameters weredetermined. Thermal analysis parameters were affected significantly by modification and chilling. Modification treatment resulted in the increaseof cooling rate, heat evolved, casting/mould interfacial heat flux and eutectic growth velocity. A theoretical model based on undercooling fromthe equilibrium temperature during eutectic solidification was used to predict growth velocities and eutectic grain size. The eutectic grain sizesestimated using the model and those measured from casting microstructures were found to be in good agreement.
Al-Si合金进行熔体处理，如变质以改善其力学性能。非破坏性的技术，像热分析通常被用来评估熔体处理的有效性。在本研究中，进行熔体处理的Al-7Si-Mg合金(A357)采用热分析研究其在凝固过程中有无冷却行为。热分析和热传输参数是确定的。变质和冷却对热分析参数有显著影响。变质处理导致冷却速率、放热量、铸件/铸型界面热通量和共晶生长速率增加。基于过冷度的理论模型，共晶凝固期间的平衡温度被用来预测增长速度和共晶晶粒尺寸。用这种模型估计的共晶晶粒尺寸与用铸件显微结构测量的具有很好的一致性。
Heat transfer and solidification behaviour of modified A357 alloy
Al–Si alloys are subjected to melt treatment like modification to improve their mechanical properties. Non-destructive technique like thermalanalysis is generally used to assess the effectiveness of melt treatment. In the present study, the behaviour of the melt treated Al–7Si–Mg alloy(A357) during solidification with or without chilling was investigated using thermal analysis. Thermal analysis and heat transfer parameters weredetermined. Thermal analysis parameters were affected significantly by modification and chilling. Modification treatment resulted in the increaseof cooling rate, heat evolved, casting/mould interfacial heat flux and eutectic growth velocity. A theoretical model based on undercooling fromthe equilibrium temperature during eutectic solidification was used to predict growth velocities and eutectic grain size. The eutectic grain sizesestimated using the model and those measured from casting microstructures were found to be in good agreement.
Al-Si合金进行熔体处理，如变质以改善其力学性能。非破坏性的技术，像热分析通常被用来评估熔体处理的有效性。在本研究中，进行熔体处理的Al-7Si-Mg合金(A357)采用热分析研究其在凝固过程中有无冷却行为。热分析和热传输参数是确定的。变质和冷却对热分析参数有显著影响。变质处理导致冷却速率、放热量、铸件/铸型界面热通量和共晶生长速率增加。基于过冷度的理论模型，共晶凝固期间的平衡温度被用来预测增长速度和共晶晶粒尺寸。用这种模型估计的共晶晶粒尺寸与用铸件显微结构测量的具有很好的一致性。
