The Phase Equilibria in W-Fe-Co-Ni system alloys. II. Isotherms of the Solidus and the phase composition of Alloys containing 10 and 20% (Fe+Co+Ni) at temperatures above 1200/sup 0/ C

Journal Article · Wed Oct 01 00:00:00 EDT 1986 · Sov. Powder Metall. Met. Ceram. (Engl. Transl.); (United States)

DOI:https://doi.org/10.1007/BF00813962· OSTI ID:7123360

Zakharov, A M; Parshikov, V G; Vodop'yanova, L S

In this work a study was made of the solidus temperature and phase compositions of tungsten alloys containing 10 and 20% total iron, cobalt, and nickel at 1400 and 1200/sup 0/ C. According to the data of metallographic and x-ray analyses the isostructural incongruently melting upsilon-phases Fe/sub 7/W/sub 6/ and Co/sub 7/W/sub 6/ in the W-Fe-Co system form a continuous series of (Fe, Co) /SUB 7W/ /sub 6/ solid solutions, the temperature of the start of fusion of which is 1640-1630/sup 0/ C. With the addition to W-Fe-Co system alloys of approximately 1 and 2% Ni their solidus temperature drops sharply to 1460-1470/sup 0/ C. With an increase in Ni content to 3 and 6% it is practically unchanged and only with 10 and 20% Ni does it increase to 1500 C (melting point of alpha + gamma eutectic in the W-Fi system where alpha + gamma are the tungsten-and nickel-base boundary solid solutions, respectively). The data obtained on the influence of Ni additions on the solidus temperature of W-Fe-Co system alloys agrees well with the phase composition of W-Fe-Co-Ni system alloys at 1400/sup 0/ C, which is close to the solidus temperature. Diagrams are included.

• Research Organization: Moscow Institute for Steel and Alloys
• OSTI ID: 7123360
• Journal Information: Sov. Powder Metall. Met. Ceram. (Engl. Transl.); (United States), Vol. 25:5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TUNGSTEN BASE ALLOYS
PHASE TRANSFORMATIONS
COBALT
COBALT ALLOYS
EQUILIBRIUM
IRON
IRON ALLOYS
ISOTHERMS
METALLURGICAL EFFECTS
NICKEL
NICKEL ALLOYS
SOLID SOLUTIONS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALLOYS
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
ELEMENTS
METALS
MIXTURES
PHYSICAL PROPERTIES
SCATTERING
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TUNGSTEN ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies