Abstract:The element source, shape, distribution, evolution migration behavior and regulation of W in metal gadolinium were studied via calcium thermal reduction and XRD applying GdF3 as raw materials and Ca as reductant in vacuum induction furnace. The results show that W mainly comes from crucible and exists in forms of melt state tungsten and inclusion Gd2(WO4)3. Content of W is the highest under surface of central region and is the lowest at 1/2 radius on ingot casting surface while W in metal gadolinium ingot casting appears partial poly. Evolutionary migration behavior of W is presented as two forms including shed, dissolution, migration redistribution in melt, and migration to bottom and center in cast mold, or W being oxidized to WO3 in form of Gd2(WO4)3 in melt, and migrating to bottom and center in cast mold. Gadolinium containing 0.008%W is obtained through regulating compactness of tungsten crucible, melting atmosphere, residual oxygen in furnace, purity of raw supplementary materials and regulation of temperature.