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Vol.30, No.8, 963 ~ 972, 1992

Title

Variation of Microstructure and Mechanical properties with Binder Compositions in W - Ni - Fe heavy Alloy

김은표Eun Pyo Kim, 이성Seong Lee, 송흥섭Heung Sub Song, 노준웅Joon Woong Noh, 백운형Woon Hyung Baek, 천길성Kil Sung Churn

Abstract

W heavy alloys with different composition of matrix were sintered at various temperatures to investigate the microstructure and mechanical properties. The Ni/Fe ratios in the composition of 93W-7 (Ni-Fe) heavy alloys were varied from 7/3 via 8/2 to 9/1 by weight. The results showed that, with increased in Ni contents, the volume fraction of matrix was increased due to increased solubility of W in the matrix. In trun, it lowered dihedral angle and facilitated matrix peneratration along the grains to lower contiguity. The increased volume fraction of ductile matrix and decreased contiguity contributed to a higher ductility and toughness. The specimen with 9/1 of Ni/Fe ratio showed the lowest impact energy even though it had the largest volume fraction of matrix and the lowest contiguity. This was attributed to the highly dissolved W in the matrix. The optimum composition in the matrix is 80% Ni and 20Fe.

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