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7075铝合金广泛用于要求高力学性能的零部件。有关技术文献指出,该合金的耐蚀性和力学性能主要决定于淬火冷却速度。这种现象通常称为“淬火敏感性”。本文的主要目的是,通过改变热处理工艺参数和轧制方向(L,LT,ST)来研究板材试样的淬火冷却速度对其性能的影响。试样均在实验室设备中热处理,以获得T6、T76和T73处理状态。试样为长方体(13 mm×13 mm×100 mm),水淬,通过改变水温或改变温度为20℃、用水搅动的浴槽中聚合物浓度来调节淬火冷却速度。在每种实验条件下,均采用置于试样中的热电偶测量冷却速度。此外,还进行了有限元(FEM)模拟试验,以测定所有试验条件下冷却过程的热传递系数;进行了拉伸试验和晶间腐蚀试验,以弄清所研究的冷却速度对7075合金板材性能的影响。
7075 aluminum alloy is widely used in parts requiring high mechanical properties. The relevant technical documents pointed out that the corrosion resistance and mechanical properties of the alloy mainly depends on the quench cooling rate. This phenomenon is commonly referred to as “quench sensitivity.” The main purpose of this paper is to study the effect of quenching and cooling rate on the properties of plate by changing the parameters of heat treatment and the rolling direction (L, LT, ST). Samples were heat treated in laboratory equipment to obtain T6, T76 and T73 treatment status. The specimen was a rectangular parallelepiped (13 mm × 13 mm × 100 mm) water-quenched. The quench cooling rate was adjusted by changing the water temperature or changing the polymer concentration in the bath stirred with water at 20 ° C. Under each experimental condition, the cooling rate was measured using a thermocouple placed in the sample. In addition, finite element (FEM) simulation tests were conducted to determine the heat transfer coefficient of the cooling process under all experimental conditions. Tensile tests and intergranular corrosion tests were conducted to clarify the effect of the studied cooling rate on the properties of 7075 alloy sheet Impact.