Abstract
The deoxidation process of Mo during arc melting is studied using, C, TiH and B as deoxidizers. Especially the effect of B on the workability of Mo is investigated. The results are summerized as follows: (1) The deoxidation reaction by C is proceeded, based on the reaction C+O=CO. The over-addition of C is not effectively used for deoxidation but causes the precipitation of intergranular carbides. (2) TiH is effective as deoxidizer. The intergranular precipitates which are made by the addition of TiH are fine and dispersed. (TiH+C) is more effective as deoxidizer. (3) B is useful as deoxidizer and also very effective in grain refinement. (4) Mo containing B has two kinds of intergranular precipitates. The one is granule-like which is made by low B addition, the other is stripe-like by high B addition. Both precipitates seem to dissolve Mo oxide precipitates and to contribute to strengthen grain boundaries. (5) Mo containing B very ductile. Even Mo which has high oxygen contents (100 ppm) can be worked at a relatively low temperature (800°C).
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