STUDIES OF REACTIONS OCCURRING DURING BETA HEAT TREATMENT OF TITANIUM.
Abstract
Thermal dilation anomalies occur when certain titanium alloys are repeatedly cycled through the allotropic transformation. These anomalies were related to the orientations of the alpha and beta phases which form during the transformation. On heating or cooling the Ti-7Al-3Cb0.06 O2 and Ti-7Al-3Cb-0.12 O2 alloys through the transformation temperature range, the thermal dilation curves may show an expansion, contraction, or no discontinuous length change, depending on the orientation of the phases. The type of expansion behavior may have a significant effect both on toughness and weldability. Impact strengths of the 7Al-3Cb titanium alloys at -80 F can be improved 3 to 5 foot-pounds by slowly heating and cooling the alloys through the transformation in vacuum. This improved impact strength is believed to be related to a decrease in hydrogen content. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 14, 1965
- Accession Number
- AD0615633
Entities
People
- D. N. Williams
- H. R. Ogden
- James J. English
Organizations
- Battelle Memorial Institute