Strengthening and Toughening Effect on Tungsten Subjected to Multiple ECAP

Abstract:

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This paper presents the research results of the grain refining effect on the ductile-to- brittle transition temperature (DBTT) of commercial purity tungsten. The as-received tungsten was subjected to eight passes of equal-channel angular pressing (ECAP) at decreasing temperatures from 1300 to 1150 °C. According to optical and TEM microscopy the average grain size was refined considerably from ~80 μm to ~1 μm. The mechanical tensile tests, carried out at various temperatures for the tungsten samples, showed that DBTT decreased approximately 80 °C as a result of microstructure refinement by ECAP, at the same time the strength also increased 50-100 % by grain refinement. SEM observation of the fractures confirmed the mechanical testing results.

Info:

Periodical:

Materials Science Forum (Volumes 667-669)

Edited by:

Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon

Pages:

701-706

DOI:

10.4028/www.scientific.net/MSF.667-669.701

Citation:

H. Yuan et al., "Strengthening and Toughening Effect on Tungsten Subjected to Multiple ECAP", Materials Science Forum, Vols. 667-669, pp. 701-706, 2011

Online since:

December 2010

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Price:

$35.00

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