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首页> 外文期刊>Kobelco Technology Review >Strengthening of Aluminum Alloy Forgings for Automotive Suspension by Two-step Aging
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Strengthening of Aluminum Alloy Forgings for Automotive Suspension by Two-step Aging

机译：Strengthening of Aluminum Alloy Forgings for Automotive Suspension by Two-step Aging

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In order to improve the fuel efficiency of automobiles, it is important to reduce the weight of vehicle bodies. The weight of suspensions is also being reduced, by applying Al-Mg-Si aluminum alloy forgings, for example. Further reducing the weight of suspensions will require additional strengthening of the material, and Kobe Steel has conducted a study to increase the strength by two-step aging. As a result, a two-step aging process combining pre-aging at 160℃ and high-temperature aging at 190℃ has achieved a peak proof stress of 390 MPa in a short time period of only 8 hours. Obtaining the same peak proof stress by single-step aging at 160℃ requires 56 hours. This is attributed to the fact that β″ phase, having a size of 3 to 4 nm, which is greater than the critical size for non-reversion, precipitates with a high number density during the pre-aging and grows at the high temperature to increase the strength. This technology has enabled a weight reduction of 3% over that of the conventional technology and is expected to contribute to improving fuel efficiency and

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