Accession Number:

AD0662189

Title:

METALLURGICAL CHARACTERISTICS OF HIGH STRENGTH STRUCTURAL MATERIALS

Descriptive Note:

Progress rept. no. 12, Jul 1966-Jan 1967

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1967-09-01

Pagination or Media Count:

135.0

Abstract:

The report includes fracture toughness studies on some new titanium alloys as well as results of an initial feasibility study aimed at raising the optimum strength and toughness limits for titanium alloys through an approach involving thick section composites. The results of salt water stress-corrosion- cracking studies on a number of titanium alloys are described including a study concerning the effect of vacuum heat treatment on stress-corrosion-cracking resistance of titanium alloys. Fatigue crack propagation studies in air and in salt water on the pressure vessel steels A302B, A201B, and A517F are discussed and the results compared to the actual service performance of these same materials in PVRC program studies. Preliminary fracture toughness correlation diagrams are presented for high strength steels based upon fracture mechanics and engineering test methods. The latest versions of the Fracture Toughness Index Diagrams for steels, titanium alloys and aluminum alloys, a usual feature of this report series and which are based upon engineering test methods, are presented and the significance of the features briefly discussed. Fracture toughness studies on thick plates of 5Ni-Cr-Mo-V, and a new 9Ni-4Co steel are reported. In addition, the results are presented for similar studies on welds of 2Mn-2Ni in 5Ni-Cr-Mo-V steels and welds of 9Ni-4Co, 12Ni-3Cr-3Mo and 17Ni- 2Co-3Mo compositions.

Subject Categories:

  • Properties of Metals and Alloys
  • Fabrication Metallurgy
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE