Pilot Plant Forging of Hydrogenated Ti-6Al-4V.
Final rept. 16 Feb 78-30 Jun 79,
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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This pilot plant forging program was performed on ingot stock which was machined into ring shaped workpieces. The rings were hydrogenated to obtain hydrogen contents between 0.1 weight percent and 1.2 weight percent. A micro-balance technique was used to determine the hydrogen content. A description of the equipment and procedures for hydrogenation of the material and verification of the hydrogen analysis is given. The ring forgings were performed on a hydraulic forge press using isothermal techniques. A temperature range between 922 K 1200 F and 1144 K 1600 F and deformation rates of 0.000126 ms 0.3 ipm and 0.0126 ms 30.0 ipm were used in the forging evaluation. Two heats of material were used. Three to six rings were forged at different reductions at each condition of temperature, rate and hydrogen content. Non-hydrogenated rings were also forged at each condition to form a baseline for comparison. Standard techniques were used to analyze the ring forging data. Results show that a 30 reduction in forging load results when material with approximately 0.4 weight percent hydrogen is used. At larger hydrogen contents, the deformation loads increase and are approximately equal to those for non-hydrogenated material when the hydrogen content is 0.8 weight percent. Deformation loads for the material with 0.4 weight percent hydrogen which are equivalent to those for non-hydrogenated produce occur at processing temperatures between 56 K 100 F and 83 K 150 F lower.
- Metallurgy and Metallography
- Fabrication Metallurgy