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| EFFECT OF HYDROGEN ON MECHANICAL PROPERTIES OF A HIGH DENSITY W-Ni-Fe ALLOY |
| Zhu Guisen; Liu Mingcheng; Lin Zhongjie and Yu Shuyan (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry) |
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Cite this article:
Zhu Guisen; Liu Mingcheng; Lin Zhongjie and Yu Shuyan (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry). EFFECT OF HYDROGEN ON MECHANICAL PROPERTIES OF A HIGH DENSITY W-Ni-Fe ALLOY. Acta Metall Sin, 1981, 17(1): 39-126.
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Abstract The effect of post-sintering heat treatment on the mechanical properties of a liquid phase sintered tungsten-base ahoy (95W-3.SNi-1.5Fe) has been investigated. Through heat treating in vacuum at 1200℃, the hydrogen content of the alloy was decreased by 70%, however, its strength was increased by 30%, and its ductility and fracture toughness were also improved. A SEM observation on the fracture surface of the alloy showed that interfacial failures occurred at the tungsten particle-matrix interface in specimens with higher hydrogen content. While in specimens with lower hydrogen content, the fracture mode were transfered from interfacial to interfacial plus partly cleavage failures in tungsten particles. It appears that the hydrogen brittleness is diminished, and the cohesion of the interfaces increased, as a result of decreasing the hydrogen content of the alloy. Ion microprobe analysis showed that in specimens with higher hydrogen content, hydrogen is concentrated at interfaces, which further accounts for the influence of hydrogen on the interracial failure of the alloy.
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Received: 18 January 1981
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