Strengthening and Toughening Effect on Tungsten Subjected to Multiple ECAP

Abstract:

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.

• Periodical: Materials Science Forum (Volumes 667-669)
• Pages: 701-706
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.667-669.701
• Online since: December 2010
• Authors: Hao Yuan, Yue Zhang, Artur V. Ganeev, Jing Tao Wang, Igor V. Alexandrov
• Keywords: Ductile to Brittle Transition (DBT), Equal-Channel Angular Pressing (ECAP), Tensile Test, Tungsten

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