Development of a Weldable High Strength Steel.
Abstract
An existing 10Ni-8Co-2Cr-1Mo steel (HY180) was modified to a higher strength level to meet the need for weldable and fracture-resistant high-strength steel alloys required in current and future airframe structural applications. This steel, which relies on the precipitation of a secondary hardening precipitate in a highly dislocated lath martensite matrix at an elevated aging temperature, appeared to be an excellent candidate for modification to meet high toughness requirements at high strength levels (230-250 Ksi UTS). Eight experimental alloys were melted where the level of alloy addition was controlled by factorial and regression analysis techniques. Six of the eight experimental alloys met the mechanical property requirements. The selected alloy composition (14Co-10Ni-2Cr-1Mo-0.16C) was scaled-up to a 2000 lb VIM/VAR heat with no apparent decrease in mechanical properties. Preliminary results indicate low fatigue crack growth rates both in ambient and corrosive environments, improved S/N fatigue and good general corrosion resistance. The 14Co-10Ni-2Cr-1Mo-0.16C steel (AF1410) was found to be quite weldable by conventional arc weld processes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1975
- Accession Number
- ADA021174
Entities
People
- C. D. Little
- P. M. Machmeier
Organizations
- General Dynamics