| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an aluminum alloy forging for a transport structural material in which, even if hot forging ratios are remarkably different between a product part and a flash part, the fining of crystal grains is possible in both the parts, and to provide an aluminum alloy forging. SOLUTION: An Al-Mg-Si based aluminum alloy casting comprising 0.6 to 1.8% Mg and 0.4 to 1.8% Si, and further comprising one or more kinds of metals selected from 0.01 to 0.9% Mn, 0.01 to 0.25% Cr and 0.01 to 0.20% Zr is subjected to homogenizing heat treatment, and is thereafter subjected to hot forging at a hot forging starting temperature of 450 to 570°C and a final hot forging finishing temperature of≥360°C. In the crystal grain size in a vertical direction to the parted face 4 of the product part 2 and the flash part 5a in the forging 1 after solution and quenching treatment and artificial age hardening treatment, the average crystal grain size in the product part 2 is controlled to≤300μm, and the maximum crystal grain size in the flash part 5a is controlled to≤400μm, respectively. COPYRIGHT: (C)2004,JPO
|
