工艺因素对319铝合金热分析特征值的影响

来源期刊：上海金属2010年第3期

论文作者：佟媛媛 华勤

文章页码：47 - 50

关键词：319铝合金； 热分析； 特征值； 浇注工艺

Key words：319 Al Alloy； Thermal Analysis； Characteristic Value； Casting Process

摘    要：运用热分析技术研究了冷却曲线特征值与319铝合金中化学成分之间的关系,并进行回归分析。结果表明,在不考虑工艺因素的情况下,试样的硅含量与α-Al枝晶生长回升温度T_G^αDEN之间的相关性最大,相关系数r为-0.65,以硅含量可预测α-Al枝晶生长回升温度。在浇注过程中,冷却速度与α-Al枝晶生长回升温度T_G^αDEN密切相关,相关系数为r=-0.72。在相同的冷却条件下,铝合金的浇注温度和浇注量对冷却速度有明显的影响,因此,可以通过调整浇注温度和浇注量,控制铝合金的冷却速度,进而也可预测铝合金中α-Al枝晶生长回升温度T_G^αDEN。

Abstract: The relationship between characteristic value of cooling curve and chemical content of 319 Al alloy were researched by thermal analysis and regression.The results showed that the correlation between the Si content in 319 Al alloy and the temperature T_G^αDEN was significant without considering the fabrication variations,where the correlation coefficient r was -0.65.The correlation between the cooling rate and the temperature T_G^αDEN was significant during the casting process and the correlation coefficient was -0.72.In the same cooling condition,the cooling rate was affected by the pouring temperature and weight,therefore,the cooling rate of 319 Al alloy could be controlled by adjusting these parameters,so as to predicting the temperature T_G^αDEN.