Published: Jan 2010
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The metallurgical feasibility of replacing lead (Pb) bath with bismuth (Bi) bath as quenching media for steel has been investigated. It is found that there is a good consistency in microstructures and hardness, i.e., mechanical properties for specimens quenched in Bi and Pb bath. On the possible side effect of Bi molten on the quality of steels, both the theoretical and experimental results indicate that there is no apparent corrosion or reaction between Bi and steel during quenching operation in Bi bath. Therefore, it can be firmly concluded that replacing Pb bath with Bi bath as quenching media for steel is proven to be practicable.
bismuth, quenching media, heat treatment
China Academy of Railway Science, Beijing,
University of Toronto,