THE SOLID SOLUBILITY AND CONSTITUTION OF YTTRIUM IN IRON-20 TO 40 w/o CHROMIUM ALLOYS

Technical Report · Tue Oct 20 04:00:00 EDT 1959

DOI:https://doi.org/10.2172/4206100· OSTI ID:4206100

Farkas, M. S.; Bauer, A. A.

The solid solubility of yttrium in iron-20 to 40 wt.% chromium alloys was determined by metallographic techniques and found to be extremely small. At 1320 deg C, the maximum solubility is about 0.12 wt. a yttrium. Study of iron- rich alloys of the iron-yttrium system shows that the compound YFe/sub 5/ exists. A eutectic occurs between iron and YFe/sub 5/ at 1257 deg C. The constitution of iron - 20 to 40 wt.% chromium-yttrium alloys ccntaining less than 6 wt.% yttrium was studied between 1250 and 600 deg C. It was found that, upon exceeding the solubility limit, YFe/sub 5/ is formed and cccurs in conjunction with alpha iron - chromium. At about 900 deg C and above 615 deg C, if more than 6 wt.% yttrium is present in the iron-35 wt.% chromium alloy and more than 3 wt. % in iron-40 wt.% chromium alloy, YFe/sub 4/ forms to give a three-phase field of alpha plus YFe/sub 5/ plus YFe/sub 4/. The upper yttrium limit of this phase field was not determined. At 815 deg C, sigma phase forms in the iron - chromium system and comes into equilibrium with YFe/sub 5/. (auth)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• DOE Contract Number: W-7405-ENG-92
• NSA Number: NSA-14-002724
• OSTI ID: 4206100
• Report Number(s): BMI-1386
• Country of Publication: United States
• Language: English

Related Subjects

CHROMIUM ALLOYS
EUTECTICS
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
IRON ALLOYS
METALLOGRAPHY
METALS, CERAMICS, AND MATERIALS
PHASE DIAGRAMS
REACTION KINETICS
SOLID SOLUTIONS
THERMODYNAMICS
YTTRIUM
YTTRIUM ALLOYS