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To clarify the effects of grain size and carbon content on the ductility of molybdenum, the vvvvvvariations in ductility with when the average grain diameter in the transverse cross section of the specimen (dT) was larger than about 0.04mm, though the mans (C=80ppm) increased with increasing dT when dT was larger than about 0.08mm. (3) In high carbon specimens (C=210 ppm) the ductility increased nearly linearly with increasing dT-1/2. (4) When dT was larger than about 0.04mm, both the medium and high carbon specimens were more ductile than the low carbon specimen. The most ductile was the medium carbon specimen which was free from the intergranular brittleness and also from coarse carbides. (5) When dT was smaller than 0.04 mm, the ductility. of the low carbon specimen was as large as, or slightly larger than, that of the high carbon specimen. However, it could not be concluded whether carbon increases or lowers the ductility in an equiaxed fine grained molybdenum because of a uniaxed recrystallized structure of the low carbon specimen.

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