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The determining role of brazing temperature in fatigue behavior of aluminium material for automotive exchanger applications

机译：钎焊温度在汽车交换应用铝材料疲劳行为中的确定作用

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摘要

Economic and environmental factors are driving heat exchanger weight reduction for automotive applications. The consequence is a need for material downgauging, analyzing what are the limiting properties for doing so.One of the main failure modes of the heat exchangers is associated to thermal shock induced by transient differential thermal expansion between the componentsThis paper will focus on the influence of the brazing temperature on the material microstructure, as a function of magnesium presence, and its consequences on the static and cyclic damage properties. Two very thin (<0.3 mm) aluminum sheets composed of 3 layers (4XXX /3XXX/ 4XXX) have been studied.In this work, tensile tests have been carried out at room temperature. Some Wohler curves assessments have been performed using constant stress amplitude with a sine-function signal, to understand the influence of the brazing on fatigue resistance in car heat-exchangers. Furthermore, the effect of brazing on microstructure, analyzed on cross-sections taken perpendicularly to the rolling direction (LT, ST plane) and at the surface, was studied and linked to fatigue and mechanical properties.
机译：经济和环境因素正在为汽车应用推动换热器重量减轻。结果是对下耳萌的材料，分析了这样做的限制性。热交换器的主体故障模式的主体失效模式与通过瞬态差分热膨胀诱导的瞬态差分热膨胀，这些纸张将关注的影响钎料温度对材料微观结构，作为镁存在的函数，其对静态和循环损伤性能的后果。已经研究了由3层（4xxx / 3xxx / 4xxx）组成的两个非常薄的（<0.3 mm）铝板。在这项工作中，在室温下进行了拉伸试验。已经使用恒定的应力幅度进行了一些Wohler曲线评估，以了解钎焊对汽车热交换器中疲劳性的影响。此外，研究并与疲劳和机械性能垂直于滚动方向（LT，ST，ST，ST平面）和表面截取的横截面上分析钎焊的微观结构的影响。

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