Factors affecting the strength and toughness of ultra-low carbon steel weld metal
Van Slyke, Jonathon J.
MetadataShow full item record
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 studied. The analysis was confined only to the weld metal, and the base metal was not considered. Analysis methods included optical microscopy, scanning electron microscopy, and transmission electron microscopy. Energy dispersive x- ray analysis was performed in the transmission electron microscope to analyze the chemical composition of non-metallic inclusions. The microstructure was found to be primarily granular ferrite with some primary ferrite, bainite, and martensite. Very little acicular ferrite was found (< 18 %). Because of this, to get the best mechanical properties in the weld, the size and volume fraction of non-metallic inclusions needs to be minimized. This can be accomplished by minimizing the amount of oxygen while increasing the amount of titanium and aluminum in the weld metal. EDX analysis revealed that the non-metallic inclusions were multi-phase particles with two predominant phases: a TiO-MnO phase and a MnO-SiO2-Al2O3, phase. Copper-sulfide caps were also found on the surface of some inclusions. This inclusion chemistry is typical of what is found in welding HSLA steel
Showing items related by title, author, creator and subject.
Fabio Alves; Grbovic, Dragoslav; Karunasiri, Gamani (SPIE, 2014);There has been a continued interest in the terahertz (THz) imaging due to penetration and non-ionizing properties. Real- time imaging in this spectral range has been demonstrated using infrared microbolometer technology ...
A study of the microstructural basis for the strength and toughness properties of overaged HSLA-100 steel Comerford, Lawrence Whitley (Monterey, California. Naval Postgraduate School, 1991-06);A certification program for the use of HSLA steel in ship construction is currently being funded by the U.S. Navy. Integral to this program is the characterization of the microstructure of the highly weldable HSLA-100 ...
Correlation of inclusion size and chemistry with weld metal composition and microstructure in arc weldments of high strength steels Eakes, Mark W. (Monterey, California. Naval Postgraduate School, 1994-12);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 ...