DEVELOPMENT OF A STABLE-BETA TITANIUM ALLOY.
Abstract
An attempt to induce compound precipitation hardening in Ti-17V-10Cr-3Al, Ti-8Mo-8V-7.5Fe-3Al, Ti-8Mo-8V7.5Fe-3Al-1Co and Ti-15Mo-5Fe-3Al alloys by cold reduction and subsequent aging resulted in hardening by alpha precipitation instead. Similar work on Ti-17V-8Cr-3Al-3Ni indicated that this alpha hardening was induced by either hot or cold rolling and suppressed by solution treatment. Solution treating, quenching and aging Ti-17V-10Cr-3Al, containing 0.5 and 1% Si, at 1250F resulted in rapid hardness increases of up to 100 Vickers points without any clear accompanying microstructural change; slow cooling suppressed this aging response. Aging responses were determined for the metastable alloys Ti-17V(1.5 to 4)Fe-3Al and Ti-8Mo-8V-(1 to 3) Fe-3Al, over a range of times and temperatures. A statistical correlation between Vickers hardness and ultimate tensile strength on stable-beta alloys indicated that 25 Vickers points corresponded to about 10,000 psi. Two metastable and two stable-beta alloys were selected for further evaluation as larger ingots: metastable Ti-17V-4Fe-3Al and Ti-8Mo-8V2Fe-3Al, and stable-beta Ti-17V-10Mn-3Al and Ti-8Mo-8V6Fe-3Al, respectively. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1963
- Accession Number
- AD0601825
Entities
People
- D. B. Hunter