Abstract
A new technology to obtain a fine-structured and high-toughness HAZ of HSLA steel for high heat input welding is developed using metallurgical thermodynamics, physical chemistry of metallurgy and material processing methods synthetically in this study. A kind of HSLA steel is designed in this experiment. The thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium and magnesium simultaneously into the steel in the form of Si-Ca alloy and Mg-Zr alloy. The effect of calcium and magnesium addition on the distribution and composition of the inclusions in the cast mi crostructure of HSLA steel was analyzed. The results show that the distribution of the inclusions is more dense and uniform with respect to the raw steel, and the size of the inclusions is smaller than the ones in the raw steel after adding Ca and Mg elements simultaneously. Lots of Ca and Mg ox ides and inclusions formed after pouring into ingots. The main components of the inclusions formed are Al2O3-MnS-CaO-ZrO2-MgO-SiO2, and most Ca and Mg inclusions are spherical and ellipsoidal.
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