Solution Treating and Aging

With the exception of low 4 K ultimate strength, yield and ultimate strengths of the Inconel 718 materials were similar to the strength levels previously reported on both solution-treated and aged or double-aged Inconel 718 plus cold-worked and aged Inconel 718 [ ]. Ductility of the STDA Inconel 718, however, fell... 

Wrought CoCr Solution treated 5-17 or solution treated and aged 6-27 Rough 5 Finish 0.8 Rough 0.25 Finish 0.13... 

Table lc,17 Influence of a solution treating and ageing on the mechanical properties of Ti6A14V (Ref. 1)... 

The a -f- p Alloy Ti-6A1-4V The ductility of annealed Ti-6A1-4V is fairly independent of temperature between room temperatiire and 77 K. Below 77 K, it decreases rapidly as the temperature continues to fall toward 20 K. The ductility of the annealed alloy is twice as great as that of the solution-treated-and-aged material—e.g., Sb77k = 11.4% as compared with 4.9% (at normal interstitial levels). Reducing the interstitial content influences the tensile properties only marginally but improves the fi acture toughness by 130% at room temperature, and by 40% at20K... 

Ti-3A1-2.5V is usually used in the annealed or in the cold worked plus stress relieved conditions. However, due to the small amount of P stabilizer present, a small age hardening response is possible from the solution heat treated condition. Only a small increase in strength is possible in thin sections by solution treating and aging. For example,... 

Heat IVeatment. Ti-6211 generally is used in the as-fabricated or fabricated plus annealed conditions (see table). A small increase in strength can be obtained by solution treating and aging, but at a sacrifice in ductility and toughness. 

Machinability of Ti-6246 in the as-forged condition is similar to that of annealed Ti-6A1-4V and Ti-6Al-6V-2Sn. In the solution treated and aged condition, it is similar to that of Ti-6Al-6V-2Sn in the same type of heat treated condition. 

Aged tensile strength was determined on solution treated and aged plate. 845 to900 C (1550to 1650 F), WQ+595 C (1100 F), 4h, AC. ... 

Effect of test temperature and specimen location on compressive yield strength of solution treated and aged specimens. Specimens were taken from 125 by 150 mm (5 by 6 in.) forgings and heat treated as follows 870 C (1650 F), 1 h + WQ + 595°C(1100 F), 4h. 

Reported typical hardness value range is 32 to 38 HRC for solution treated and aged material. 

Heat Treatment. Ti-7Al-4Mo is used in the annealed or solution treated and aged condition. Typical treatments are shown below (see table). 

Although annealing treatment had only a minor effect on creep properties (700 °C anneal was worse than 790 °C), the solution treated and aged condition provided substantially better properties than both annealed conditions. 

Product Conditions. SP-700 is specified in either the annealed or the solution-treated and aged condition. The alloy consists of a very fine mi-crostructm e in all heat treatment conditions—for example, the primary a grains are t3T)ically smaller than 3 pm in the reciystallization annealed condition. It can be hardened to 450 HV or higher by solution treatment in the a + P region followed by short-time aging. 

Hardness. Mill-azmealed SP-700 has a hardness of 300 to 330 HV. Recrystallization-annealed SP-700 has a hardness of 280 to 320 HV Solution treated and aged SP-700 offers a wide range of hardness, from 350 to 510 HV, depending on solution treating and aging conditions. 

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