Accession Number : ADA319304

Title :   The Role of Microstructure in the Fast Fracture of Multipass Welds Deposited Using E-10018-M1 Electrodes.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Davidson, James L.

PDF Url : ADA319304

Report Date : AUG 1996

Pagination or Media Count : 28

Abstract : Weld metal deposited using MIL-E-10018-M1 electrodes maintains very good fracture resistance, despite being comprised of a seemingly deleterious microstructure which includes extensive networks of pro-eutectoid grain boundary ferrite in the as-deposited weld metal and brittle martensite-austenite particles in the intercritically reheated weld metal and heat affected zone. To reconcile this contradictory structure-property relationship the report focuses on the fractography and metallography of a MIL-E-10018-M1 multipass weld, fractured during an explosion bulge test. Martensite-austenite particles identified in the intercritically reheated weld metal and heat affected zones were found to play no part in the fracture process. Pro-eutectoid grain boundary ferrite was shown to be the preferred fracture path in the as-deposited weld metal however, it does not substantially reduce the overall fracture resistance of the multipass weld metal.

Descriptors :   *MICROSTRUCTURE, *FRACTURE(MECHANICS), *WELDS, *ELECTRODES, TEST AND EVALUATION, RESISTANCE, BULGING, PATHS, EXPLOSIONS, FRACTOGRAPHY, WELD METAL, AUSTRALIA, METALLOGRAPHY.

Subject Categories : Metallurgy and Metallography
      Electrical and Electronic Equipment
      Electricity and Magnetism
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE