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Correlation of inclusion size and chemistry with weld metal composition and microstructure in arc weldments of high strength steels

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Author
Eakes, Mark W.
Date
1994-12
Advisor
Fox, Alan G.
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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.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/42797
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  • 1. Thesis and Dissertation Collection, all items

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    Factors affecting the strength and toughness of ultra-low carbon steel weld metal 

    Van Slyke, Jonathon J. (Monterey, California. Naval Postgraduate School, 1999-12-01);
    The factors that affect strength and toughness often ultra-low carbon steel weld samples (HSLA-80 and HSLA-100), welded using the gas metal arc welding (GMAW) process and new ultra-low carbon consumable electrodes, were ...
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    The role of titanium in the non-metallic inclusions which nucleate acicular ferrite in the submerged arc weld (SAW) fusion zones of Navy HY-100 steel 

    Fox, A.G.; Brothers, D.G. (Pergamon, 1995-04-01);
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    Determination of inclusion chemistry and size distribution in steel weldments by analytical electron microscopy 

    Hackstaff, Craig Allen (2001-06);
    The U.S. Navy has been concerned about reducing the number of inclusions in steel weldments to increase the toughness of the weld metal. Research has shown that particular inclusions can nucleate the acicular ferrite micro ...
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