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研究了双级时效工艺和回归再时效(RRA)工艺对B95ЛЧ铝合金锻件的断裂韧性和应力腐蚀性能的影响。测定了9种双级时效工艺和3种RRA工艺状态下的断裂韧度,同时测定了各时效工艺状态下的电导率和强度指标。通过对试样组织性能的分析研究发现:当一级时效条件相同时,随着二级时效温度的升高和时效时间的延长,断裂韧度和抗应力腐蚀性能提高,其中以115℃×7h+185℃×13h为最佳时效工艺。RRA工艺能使合金获得最高的强度,经回归20min的RRA试样的抗应力腐蚀性能也能达到115℃×7h+185℃×13h的水平,但断裂韧度不如采用较高二级时效温度的试样。
The effects of two-stage aging process and regression re-aging (RRA) process on the fracture toughness and stress corrosion resistance of B95ЛЧ aluminum alloy forgings were investigated. The fracture toughness of 9 kinds of double-stage aging process and 3 kinds of RRA process were measured, and the conductivity and strength index of each aging process were measured. Through the analysis of the microstructure and properties of the samples, it is found that the fracture toughness and the stress corrosion resistance increase with the increase of the second aging temperature and the aging time when the first aging conditions are the same. + 185 ℃ × 13h for the best aging process. RRA process can make the alloy get the highest strength, and the stress corrosion resistance of the RRA sample after returning to 20min can reach the level of 115 ℃ × 7h + 185 ℃ × 13h, but the fracture toughness is not as good as the second aging temperature test kind.