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Effect of impurities on the weldability of powder metallurgy, electron-beam melted and arc-melted molybdenum and its alloys

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Abstract

Welds of various molybdenum metals and alloys were examined by bend tests between 183 and 333 K, and the fracture surfaces were observed by scanning electron microscopy and Auger electron spectroscopy. In PM-Mo, blow holes were formed but weldability was improved by selecting high-purity powder, which contained low concentrations in oxides forming impurities, to reduce the total content of oxygen. Nitrogen segregated to grain boundaries promoted intergranular brittleness in PM-Mo. However, in EB-Mo, AM-Mo, Mo 0.56%Nb and TZM, nitrogen was hardly detected and carbon segregation was always present at grain boundaries. Carbon segregation and carbide precipitation were found to strengthen the grain-boundary cohesion and improve the ductility.

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  1. National Research Institute for Metals, 1-2-1 Sengen, 305, Tsukuba, Japan

    Fumio Morito

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  1. Fumio Morito
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Morito, F. Effect of impurities on the weldability of powder metallurgy, electron-beam melted and arc-melted molybdenum and its alloys. J Mater Sci 24, 3403–3410 (1989). https://doi.org/10.1007/BF01139072

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  • DOI: https://doi.org/10.1007/BF01139072

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