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首页> 外文期刊>Journal of Materials Engineering and Performance >Dry and Clean Age Hardening of Aluminum Alloys by High-Pressure Gas Quenching
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Dry and Clean Age Hardening of Aluminum Alloys by High-Pressure Gas Quenching

机译：高压气体淬火对铝合金进行干式和时效硬化

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摘要

When precipitation-hardenable aluminum parts are water quenched, distortion occurs due to thermal stresses. Thereby, a costly reworking is necessary, and for this reason polymer quenchants are often used to reduce distortion, with the disadvantage that the quenched parts have to be cleaned after quenching. In opposition to liquid quenchants, gas quenching may decrease distortion due to the better temperature uniformity during quenching. Furthermore, cleaning of the quenched parts can be avoided because it is a dry process. For this purpose, a heat-treating process was evaluated that included a high-pressure gas-quenching step. Gas quenching was applied to different aluminum alloys (i.e., 2024, 6013, 7075, and A357.0), and tensile tests have been carried out to determine the mechanical properties after solution annealing, gas quenching, and aging. Besides high-pressure gas quenching, alloy 2024 was quenched at ambient pressure in a gas nozzle field. The high velocity at the gas outlet leads to an accelerated cooling of the aluminum alloy in this case. Aluminum castings and forgings can be classified as an interesting field of application of these quenching methods due to their near-net shape before the heat treatment. Cost savings would be possible due to the reduced distortion, and therefore, less reworking after the precipitation hardening.
机译：当将可沉淀硬化的铝部件用水淬火时，由于热应力会发生变形。因此，必须进行昂贵的返工，并且由于这个原因，聚合物淬火剂通常用于减少变形，其缺点是淬火后必须清洗淬火的零件。与液体淬火剂相反，由于淬火过程中更好的温度均匀性，气体淬火可以减少变形。此外，可以避免淬火部件的清洁，因为这是干燥过程。为此目的，评估了包括高压气体淬火步骤的热处理工艺。将气体淬火应用于不同的铝合金（即2024、6013、7075和A357.0），并进行了拉伸试验以确定固溶退火，气体淬火和时效后的机械性能。除高压气体淬火外，合金2024在气体喷嘴场中于环境压力下淬火。在这种情况下，气体出口处的高速导致铝合金的加速冷却。铝铸件和锻件由于其在热处理之前的近净形状而可以归类为这些淬火方法的有趣应用领域。由于减少了失真，因此可以节省成本，因此，沉淀硬化后的返工更少。

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