Effects of B and Ti on the Toughness of HSLA Steel Weld Metals

Abstract

Abstract: Effects of microalloying Ti and B on the microstructures and low temperature toughness of manual metal arc (MMA) deposits were investi- gated.Weld metals containing 200-300 ppm Ti and 29-60 ppm B deposited by manual coated elec- trodes provided an optimum low temperature toughness.The addition of B in weld metals low- ered the γ→α transformation temperature which promoted the acicular ferrite (AF) transformation. Solid solutioned B suppressed grain boundary ferrite as well as side plate ferrite formation and benefited the acicular ferrite formation.Titanium protected B from oxidizing as well as nitriding and formed Ti-Mn silicate inclusions.Ultra-high volt- age electron microscope analyses showed that TiO structure in the Ti-Mn silicate inclusions was the favorable nucleation site for acicular ferrite forma- tion.

Key words: toughness, acicular ferrite, HSLA steel, weld metals, addition of B and Ti

SI Zhongyao WANG Zhaoqing LIU Peng YU Dehua LIU Lei ** Institute of Metal Research,Academia Sinica,Shenyang,110015,China*** Capital Iron and Steel Company,Beijing,100053,China+ To whom correspondence should be addressed. Effects of B and Ti on the Toughness of HSLA Steel Weld Metals[J]. J Mater Sci Technol, 1992, 8(4): 294-298.

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Effects of B and Ti on the Toughness of HSLA Steel Weld Metals

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