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 The isostructural intermediate μ-phases Fe7W5 and Co7W6 in the W—Fe—Co system form a continuous series of μ-solid solutions. In the 1640–1630°C range the L + α ⇄ μ(Fe7W6) peritectic equilibrium in this system changes to a similar L + α ⇄ μ(Co7W6) equilibrium, where α is the tungsten-base boundary solution. In the W-Fe-Co-Ni polythermal tetrahedron in the 1470–1460°C range conversion of the L +α⇄μ(Fe7W6)+γ, peritectic equilibrium into the similar L + α ⇄ μ(Co7W6) + γ, where γ is the nickel-, γ-ironcobalt-base boundary solution, occurs. Upon completion of crystallization at 1400°C, the W-Fe-Co system alloys with 10–20% (Fe + Co) have a α + μ phase composition, while the W-Fe-Co-Ni system alloys with 10–20% (Fe + Co + Ni) accordingly have α + μ, α + μ + γ or μ + γ. At temperatures below 1215°C in alloys rich in iron, FeW may be formed instead of μ-phase and therefore the alloys may have an α + FeW, α + μ + FeW, α + μ + γ + FeW and α + γ + FeW phase composition.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00813962
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