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- W129843669 abstract "The object of this research was to improve the fabrication of Ti-6Al-4V sheet metal shapes in heat treated conditions. Experience has shown that heat treating titanium parts after forming is impractical due to high rejection rates caused by contamination and distortion. This work was based on the results of a formability analysis of titanium and titanium alloys conducted prior to the fabrication of shapes. The analysis was based on four criteria: (1) mechanical properties of material before and after forming, (2) springback effects, (3) formability limits at temperature, and (4) mechanical properties at forming temperature. As a result of the investigation, it was determined that the most practical procedure of fabricating heat treated parts was to use solution treated and aged (STA) material., preform at 1000°F, then hot-size at 1000–1200°F. Two factors were found to be important: (1) Time —time of hot forming and sizing above 1000°F should be kept to 30 min maximum. (2) Grain direction —Grain direction should be controlled to prevent the forming axis from being parallel to the grain or rolling direction. This work demonstrated that Ti-6Al-4V sheet metal parts can be successfully made in STA (165 ksi) and STOA † † STOA = Conditions, here, refer to ST or STA materials which have been overaged during forming (see Fig. 11). The author is with Rohr Corporation, Chula Vista, California, U.S.A. (155 ksi) conditions. The mechanical properties of these parts showed a 15–20% increase in tensile and yield strength, a 9.5% increase in notch strength (K t = 17), and a ductility comparable to the mill-annealed parts (see Fig. 11)." @default.
- W129843669 created "2016-06-24" @default.
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- W129843669 date "1970-01-01" @default.
- W129843669 modified "2023-09-26" @default.
- W129843669 title "FORMING Ti–6Al–4V SHEET METAL IN FOUR HEAT TREATED CONDITIONS" @default.
- W129843669 doi "https://doi.org/10.1016/b978-0-08-006564-9.50118-4" @default.
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