Armstrong, Westerman, Hattori, McLeland & Naughton
Repeated sintering of tungsten based heavy alloys for improved impact toughness
 A method for heat-treatment of tungsten based alloys, capable of improving impact toughness while keeping tensile strength and elongation. The method comprises maintaining a sintered tungsten based alloy consisting of 86 to 99 weight % tungsten and the balance at least one selected from a group consisting of nickel, iron, copper, cobalt and molybdenum, at a temperature ranged from 950.degree. to 1,350.degree. C. for a maintenance time of one minute to 24 hours, quenching the sintered alloy in water or in oil, and repeating the maintaining and quenching steps. 
Agency for Defense Development Poongsan Corporation
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Young M. Kyung J. Joon W. Eun P. Moon L. Woon H. Seong Kil S. Heung S.
Lee Park Noh Kim Hong Baek Lee Churn Song