In this study, the cooling behavior of Sr-modified A356 alloy aluminum wheels produced by low-pressure die-casting technology was investigated in different quenching mediums. Water and surfactant quenchants were used in order to determine the cooling rate and mechanical properties of the alloy. A thermocouple was attached to the wheels, and parts were immersed into different quenching mediums after solution treatment. Data were collected by using a data logger. Tensile test and hardness test were carried out in order to determine the effect of quenching step on mechanical properties. Statistical analysis was performed, and graphics were drawn with Minitab. Maximum cooling rates throughout the quenching were obtained, respectively, 61–68–70–85 °C/s at SDS, Triton X-100, Tween 20 and water quenching medium. It was found that 61 °C/s is enough to suppress precipitation for artificially aging, and the cooling rate at Leidenfrost point is the most important parameter for correlation with mechanical properties. According to the hypothesis analysis, only yield strength values were affected by the quenching rate at LDP statistically.

中文翻译：

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表面活性剂淬火介质中A356合金的冷却行为

在这项研究中，研究了低压压铸技术生产的Sr改性A356铝合金轮毂在不同淬火介质中的冷却性能。为了确定合金的冷却速率和机械性能，使用了水和表面活性剂淬火剂。将热电偶连接到车轮，并将零件在固溶处理后浸入不同的淬火介质中。通过使用数据记录器收集数据。为了确定淬火步骤对机械性能的影响，进行了拉伸试验和硬度试验。进行统计分析，并使用Minitab绘制图形。在SDS，Triton X-100，Tween 20和水淬火介质中，整个淬火过程的最大冷却速率分别为61–68–70–85°C / s。发现61℃/ s足以抑制人为老化的沉淀，并且莱顿弗罗斯特点的冷却速率是与机械性能相关的最重要参数。根据假设分析，LDP的淬火速率仅统计屈服强度值。