Accession Number : ADA292024

Title :   Correlation of Inclusion Size and Chemistry with Weld Metal Composition and Microstructure Arc Weldments of High Strength Steels.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Eakes, Mark W.

PDF Url : ADA292024

Report Date : DEC 1994

Pagination or Media Count : 144

Abstract : Non-metallic inclusions are crucial to the development of acicular ferrite, the desired microstructure for optimal strength and toughness in weld metal. This study focused on obtaining correlation between the size and chemistry of inclusions and weld metal properties, especially the amount of acicular ferrite, in Gas Metal Arc (GMA) and Submerged Arc (SA) weldments in HY- 100 and HSLA-100 steel. A strong correlation was found between the amount of acicular ferrite, flux basicity and inclusion composition and volume fraction in SAW weld metal samples. An index developed to consider the effect of chemistry and volume fraction of inclusions on acicular ferrite showed good correlation. The GMA weld samples were found to contain less acicular ferrite than the SAW samples, principally because of their lower oxygen content. However, it was again found possible to correlate inclusion chemistry and volume fraction with acicular ferrite formation. Unfortunately, the large amount of data scatter precluded the development of an index in this case. (MM)

Descriptors :   *HIGH STRENGTH ALLOYS, *STEEL, *WELD METAL, *ARC WELDING, *ARC WELDS, SCANNING ELECTRON MICROSCOPES, MICROSTRUCTURE, THESES, TOUGHNESS, STRENGTH(MECHANICS), CHEMICAL COMPOSITION, GAS METAL ARC WELDING, INCLUSIONS, WELDMENTS, YIELD STRENGTH, SUBMARINE HULLS, OPTICAL SCANNING, FERRITES, SUBMERGED ARC WELDING.

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy
      Couplers, Fasteners, and Joints
      Submarine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE