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In this study the Mn content fluctuations in the deposited metals and their influence on the impact toughness and corrosion resistance were investigated. The experimental results indicated that the deposited metal containing 1.05 w/%Mn when compared with the deposited metal containing 1.34 w/%Mn increased the impact toughness by 40 % and that the increment in energy absorbed by the crack propagation accounted for 88 % of the increment in impact energy. Further, the self-corrosion potential difference between the deposited metals and the weathering steel was less than 20 mV, leading to similar corrosion resistances. The results revealed that the Mn content fluctuations did not significantly influence the self-corrosion potential of the deposited metals; furthermore, the increase in the impact toughness can be attributed to: a) the decrease in the volume fraction of the grain-boundary ferrite and ferrite side plates in the columnar zone, b) an increase in the number of large grain boundaries in the fine-grain reheating zone, and c) the refining of the martensite–austenite constituents.

Effect of manganese content on the impact toughness and corrosion resistance of deposited metals of weathering steel