Fatigue and Fracture of Ultrahigh Strength Steel and Titanium Roll-Bonded and Diffusion-Bonded Laminates.
Abstract
The results of the fabrication by roll bonding of metal-metal laminates and the fatigue and fracture toughness testing of these laminates are reported and discussed. Laminate panels have been prepared from layers of steel alloy 300M interleaved with thin layers of two carbon steels and an ultrahigh carbon steel and from Ti-10V-2Fe-3Al interleaved with Ti-15V-3Cr-3Al-3Sn by roll bonding and from Ti-6Al-4V interleaved with commercially pure titanium by diffusion bonding. Both the steel and titanium alloys were heat treated such that their maximum strengths were obtained. Through proper selection of interleaf alloys (thin layers of material bonded between primary layers of the principal alloy) and heat treatment, critical frcture toughness properties were improved by over 100% over the monolithic values at ultimate strength levels of 290 ksi (1999 MPa) for the 300M steel and 190 ksi (1310 MPa) for the Ti-10V-2Fe-3Al. This improvement brought the toughness at these strength levels to values acceptable for damage tolerant service in aerospace structures or other structures requiring high fracture toughness at high strength levels. Furthermore, the fatigue strength of simulated flawed structural items machined from laminated plate was demonstrated to be superior to the equivalent monolithic material for both the steel and titanium alloys. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1980
- Accession Number
- ADA086511
Entities
People
- D. H. Peterson
- L. E. Sloter
Organizations
- Vought