Effect of Melting on High Hardness Alpha Stabilized Areas in Ti-6Al-4V Alloy.
Final technical rept. 1 Feb 69-31 Jan 71,
TRW EQUIPMENT LABS CLEVELAND OH MATERIALS DEVELOPMENT DEPT
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The chemical, metallurgical, and physical properties of a titanium oxynitride synthesized defect material introduced into a Ti-6Al-4V alloy briquette electrode and remelted were determined. The metallurgical stability of this synthesized defect material was studied by hot stage microscopy and further remelt of the defect material. Experimental techniques utilized in this program were standard metallographic techniques, microhardness traverse, electron microprobe analysis, high temperature metallography and induction melting. Twelve defect-containing specimens were characterized to a varying degree. Microhardness and microprobe analysis of the synthesized titanium oxynitride defect in arc melted Ti-6Al-4V alloy revealed it to be metallurgically unchanged by the remelt operation. Considerable solution of the oxynitride material occurred during exposure to the molten titanium alloy. Hot stage exposure of the oxynitride of 60 minutes at both 2000 and 2100F, followed by another 100 minutes at 2200F did not eliminate the alpha stabilized defect area. The formation of diffusion voids in the surrounding normal matrix destroyed the integrity of this material. The titanium oxynitride defect was dissolved in molten Ti-6Al-4V alloy during induction melting. Author
- Properties of Metals and Alloys