Effects of Some Additional Elements on the Ductility of Electron Beam Melted Molybdenum Ingots

Tsuya, Kazuo; Aritomi, Noriyoshi

doi:10.2320/jinstmet1952.30.10_952

Cited by 13 publications

(2 citation statements)

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“…Grain boundaries of pure molybdenum after recrystallization are intrinsically weak [2] and hence its fracture mode is principally an intergranular-type. However, small addition of carbon strengthens these grain boundaries [2][3][4][5][6][7] and consequently changes the fracture mode from an intergranular-type to a transgranular-type. Carbon addition was carried out at relatively low temperatures with the heating time being short and constant (1.2 ks).…”

Section: Introductionmentioning

confidence: 99%

Carbon diffusion behavior in molybdenum at relatively low temperatures

Hiraoka¹,

Imamura²,

Kadokura³

et al. 2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Carbon diffusion behavior in molybdenum at relatively low temperatures

Hiraoka¹,

Imamura²,

Kadokura³

et al. 2010

Journal of Alloys and Compounds

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“…[1][2][3][4][5][6][7][8] A small amount of carbon can significantly enhance the fracture strength of pure molybdenum, and consequently, its ductility. The latter effect is characterized by the relative decreasing in the ductile-to-brittle transition temperature (DBTT).…”

Section: Introductionmentioning

confidence: 99%

Change of Mechanical Property and Fracture Mode of Molybdenum by Carbon Addition

Kadokura¹,

Hiraoka

Yamamoto³

et al. 2010

Mater. Trans.

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Commercially available specimens of pure molybdenum were immersed in a graphite-filled Ta container and heated at a relatively low temperature of 1373 and 1473 K for 1.2 to 18.0 ks. Changes in the yield and maximum strength were evaluated by a three-point bending test at a temperature between room temperature and liquid-nitrogen temperature. Then two parameters, critical stress (apparent intergranular fracture strength) and critical temperature (DBTT), were determined. Finally, the fracture mode was examined using SEM and the apparent transgranular fracture strength was estimated from the relationship between the critical stress and the fracture mode.Results are summarized as follows. (1) Both the critical stress and the critical temperature changed drastically with carbon addition and exhibited a peak value under optimum conditions: 1373 K-3.6 ks and 1473 K-1.2 ks. (2) The fracture mode changed from intergranular to transgranular after carbon addition. (3) The change in the critical stress as a function of the increase in carbon content in this work almost agrees with that in the previous work of Hiraoka et al. (4) The apparent transgranular fracture strength was unchanged (about 990 MPa) after carbon addition of 10 mass ppm or less. This value is almost equal with that before carbon addition. The apparent transgranular fracture strength was lowered after excess carbon addition.

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