Factors affecting the impact toughness of ultra low carbon steel weld metal
Gwin, Mary Elizabeth
MetadataShow full item record
The fundamental factors affecting the impact toughness of four gas metal arc welds (GMAW) made on HSLA-100 base plate using a newly developed steel weld wire were studied. The weld metal analysis included chemistry, mechanical testing (hardness, CVN/FATT), as well as optical, scanning and transmission electron microscopy. Studies of inclusion composition using energy dispersive x-ray (EDX), and electron energy loss spectroscopy (EELS) in the transmission electron microscope were also performed. It was found that increasing oxygen content of the weld metal (due to increased oxygen in the shielding gas) led to increased non-metallic inclusion size and volume fraction; which in turn, led to both decreasing strength and toughness. The strength was lowered because increasing oxygen in the shielding gas led to increased 'consumption' of strengthening alloys such as carbon, manganese and silicon. The toughness was compromised by the increasing size and number of oxide inclusions as these provide sites for void formation and subsequent fracture
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
A study of the microstructural basis for the strength and toughness properties of as-quenched and quenched and tempered high copper HSLA-100 steel Winters, Harvey Allen (Monterey, California. Naval Postgraduate School, 1991-12);A program for the use of high copper HSLA-100 steel as a replacement for HY-130 in ship construction is in progress at the David Taylor Naval Research Center in Annapolis, Maryland. The characterization of the microstructure ...
The effect of varying the MnO content of the flux used for the submerged arc welding of Navy HY-100 steel Clark, Allen L. (Monterey, California. Naval Postgraduate School, 1995-12);Weld metal strength and toughness are determined by its microstructure, which is in turn determined by the concentration of various alloying elements and impurities as well as the welding thermal cycle. This study investigated ...
Suka, Akira (Monterey, California. Naval Postgraduate School, 1992-06);The microstructure and mechanical properties of highly welda ble high copper HSLA-100 steel in two-inch (50 mm) plate form were investigated in this work. The mechanical property data showed that the steel in the as-quenched ...