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7049—T73锻件具有可与7075—T73相比拟的抗应力腐蚀性能,而强度却此7075—T73高10—15％。因7049—T73把合金元素、加工过程和热处理很好地综合到一起了。从而使其强度高,而抗应力腐蚀性能也好。为增加7049—T73的抗应力腐蚀性能而把它过时效时,高锌:镁比使合金保留下更多的强度。低的铬含量减小了淬火敏感性,因此7049—T73合金在厚断面中可得到较好的强度。此外,低的铬含量减小了方向性,使性能更均匀。低的铁、硅和铜含量,有助于保持高的断裂韧性。 7049—T73锻件的断裂韧性、缺口抗张强度和缺口冲击强度与7075—T6大体相同。
The 7049-T73 forgings have stress corrosion resistance comparable to the 7075-T73, yet the strength of the 7075-T73 is 10-15% higher. Due to the 7049-T73 alloying elements, processing and heat treatment well together. Thus giving it high strength and good resistance to stress corrosion. To over-age the 7049-T73 for its stress corrosion resistance, the high zinc: magnesium retains more strength than the alloy. Low chromium content reduces the quench sensitivity, so 7049-T73 alloy in thick sections can get better strength. In addition, low chromium levels reduce directivity and make the performance more uniform. Low iron, silicon and copper content helps to maintain high fracture toughness. The fracture toughness, notched tensile strength and notched impact strength of 7049-T73 forgings are generally the same as for 7075-T6.