Accession Number:

AD0787568

Title:

Test and Exploratory Development of an Optimum Aluminum Alloy Stystem for Ship Structures.

Descriptive Note:

Final technical rept. 23 Jun 72-23 Jul 74,

Corporate Author:

ALUMINUM CO OF AMERICA ALCOA CENTER PA PHYSICAL METALLURGY DIV

Report Date:

1974-07-23

Pagination or Media Count:

78.0

Abstract:

Evaluation of plate fabricated in the laboratory from a series of Al-Mg alloys having magnesium contents of 7.0 to 9.5 showed an alloy designated as CS19 met the contract requirement of an as-welded yield strength of 30 ksi minimum. Fracture toughness and resistance to general corrosion, to exfoliation and to initiation of stress-corrosion cracks were at least equivalent to present 5456-H116 or H117 alloys. MIG weldments of CS19 plate produced with CS19 electrode and by a practice which provides interpass cooling to 250F were highly resistant to stress-corrosion cracking even after thermal treatment at 212F to simulate metallurgical changes taking place during long periods of service. Nominal composition of CS19 is Al-8.25 Mg-0.4 Mn-0.1 Cr with 0.12 max. Fe and 0.10 max. Si. Modified author abstract

Subject Categories:

  • Properties of Metals and Alloys
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE