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Matrix Penetration of W/W Grain Boundaries and Its Effect on Mechanical Properties of 93W-5.6Ni-1.4Fe Heavy Alloy

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Abstract

The matrix phase of 93W-5.6Ni-l.4Fe heavy alloy has penetrated into W/W grain boundaries during a newly developed heat treatment which consists of repeated isothermal holdings at 1150 °C and water quenching between them. With the matrix penetration, the impact energy increases from 57 to 170 J, whereas the ultimate tensile strength and elongation remain un- changed. The tensile fracture surface of specimens appears similar regardless of the matrix penetration: predominant cleavage of W grains and dimple fracture of matrix. The fracture sur- face by impact, on the other hand, reveals a change of W/W interface failure toward ductile failure of penetrated matrix with many dimples by increasing the matrix penetration. The in- crease in the fraction of ductile failure and observed crack blunting is attributed to the increase in impact energy with the matrix penetration.

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Authors and Affiliations

  1. Advanced Technology and Research Center, Agency for Defense Development, 305-600, Yusung, Taejon, Korea

    Joon-Woong Noh (Senior Researcher), Eun-Pyo Kim (Researcher), Heung-SUB Song (Senior Researcher), Woon-Hyung Baek (Principal Researcher) & Kil-Sung Churn (Director)

  2. Department of Ceramic Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701, Taejon, Korea

    Suk-Joong L. Kang (Professor)

Authors
  1. Joon-Woong Noh
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  2. Eun-Pyo Kim
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  3. Heung-SUB Song
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  4. Woon-Hyung Baek
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  5. Kil-Sung Churn
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  6. Suk-Joong L. Kang
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Noh, JW., Kim, EP., Song, HS. et al. Matrix Penetration of W/W Grain Boundaries and Its Effect on Mechanical Properties of 93W-5.6Ni-1.4Fe Heavy Alloy. Metall Trans A 24, 2411–2416 (1993). https://doi.org/10.1007/BF02646520

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  • DOI: https://doi.org/10.1007/BF02646520

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