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首页> 外文期刊>Journal of Materials Engineering and Performance >Energy Efficient Heat Treatment for Linerless Hypereutectic Al-Si Engine Blocks Made Using Vacuum HPDC Process
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Energy Efficient Heat Treatment for Linerless Hypereutectic Al-Si Engine Blocks Made Using Vacuum HPDC Process

机译：采用真空HPDC工艺制造的无衬套过共晶Al-Si发动机缸体的节能热处理

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摘要

Heat treatment standards developed by the aluminum industry over the last several decades are often not well optimized when applied to components cast by high cooling rate processes such as High Pressure Die Casting (HPDC), Low Pressure Permanent Mold (LPPM), Squeeze Casting, etc. The inherently finer as-cast structures should not require long solution times for the effective dissolution of intermetallic phases and the adequate thermal modification of structural constituents. Hence, long and expensive T6 and T7 treatments should not be required. Heat treatment studies involving as-cast laboratory samples with SDAS = 13.6 μm (equivalent to a thick-section HPDC casting) were conducted. Traditional and modified solution and aging treatments were compared. These studies suggest that a reduction of up to 92% in thermal processing time is possible while maintaining and/or improving the cast component’s metallurgical characteristics including hardness (≥75 HRB), dissolution of secondary phases, and spheroidization of the eutectic Si as well as overall homogeneity. Vacuum HPDC of an actual hypereutectic Al-20%Si motorcycle engine block confirmed the potential for significantly reduced heat treatment times, energy consumption, and overall costs.
机译：铝行业在过去几十年中制定的热处理标准在应用于高冷却速率工艺（例如高压压铸（HPDC），低压永久铸模（LPPM），挤压铸造等）铸造的零件时，往往没有得到很好的优化。固有的较细的铸态结构不需​​要长时间的溶解时间就能有效地溶解金属间相并适当地对结构成分进行热改性。因此，不需要长时间且昂贵的T6和T7治疗。进行了涉及SDAS = 13.6μm（相当于厚截面HPDC铸件）的铸造实验室样品的热处理研究。比较了传统和改良溶液以及老化处理。这些研究表明，在保持和/或改善铸造部件的冶金特性（包括硬度（≥75 HRB），二次相的溶解以及共晶Si以及球化）的同时，可以减少多达92％的热处理时间。整体同质。实际的过共晶Al-20％Si摩托车发动机缸体的真空HPDC证实了显着减少热处理时间，能耗和总成本的潜力。

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