ISSN:
1573-9066
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions In the W-Fe-Ni system subjected to annealing at 800 and 575°C, isostructural phases FeW and NiW form a continuous series of (Fe, Ni)W-type solid solutions. At 800 and 575°C, the phases NiW2 and (Fe, Ni)W or a solid solution of nickel in the FeW phase are in equilibrium with the tungsten-based α-solid solution and (Ni, Fe)W or a solid solution of iron in the NiW phase exists in equilibrium with the NiW2 phase. It is assumed that an invariant eutectoid equilibrium μ ⇆ α + γ + (Fe, Ni)W exists in the system under study at a temperature of approximately 1130°C (μ is the Fe7W6 phase; and α and γ are the tungsten and the nickel-based solid solutions). Depending on the temperature, the phase composition of the binder present in the tungsten-based heavy alloys subjected to long-term annealing can undergo changes: at temperatures exceeding 1110°C, the binder consists of a nickel-based solid solution; in the 1100–1000°C range, an intermediate (Fe, Ni)W phase is present along with this phase; and at temperatures below 1000°C, it consists of the intermediate phases (Fe, Ni)W and NiW2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01172046
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