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A STUDY OF CHROMIUM-NIOBIUM-TITANIUM ALLOYS

Journal Article · · Issled. po Zharoproch. Splavam, Akad. Nauk SSSR, Inst. Met.
OSTI ID:4703970
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A systematic study was made on Cr-based alloys containing up to 47.5% Nb and 37.5% Ti, and Nb-based alloys containing up to 30% Cr and 30% Ti. The isothermal sections at 1250 and 1380 deg C are presented. In the Cr-rich corner (above 60% Cr) there are three one-phase regions ( alpha -solid solution based on Cr, BETA -solid solution based on NbCr/sub 2/, and gamma -solid solution based on TiCr/sub 2/), three twophase regions ( alpha + BETA , alpha + gamma , BETA + gamma ) and one three-phase region ( alpha + BETA + gamma ) at 1250 deg C; at 1380 deg only alpha , BETA , and alpha + BETA exist and a liquid phase (composition 25 to 35% Ti, 5 to 15% Nb) is observed. In the Nb-rich corner (above 70% Nb) there are a single phase region delta (Nb-based solid solution) and a two-phase region BETA + delta ; the delta region is enlarged on heating to 1380 deg but both regions exist at 1250 and 1380 deg C. Although some of the alloys in the system studied are characterized by a high hardness (H/ sub T/ = 1187 kg/m/sup 2/ for the alloy containing 30% Cr, 70% Nb at 600 deg C), and others are characterized by high resistance to scale formation at high temperatures (the alloy containing 25% Cr, 5% Ti), there are no alloys that have both properties simultaneously. (OTS)
Research Organization:
Originating Research Org. not identified
NSA Number:
NSA-17-027826
OSTI ID:
4703970
Journal Information:
Issled. po Zharoproch. Splavam, Akad. Nauk SSSR, Inst. Met., Journal Name: Issled. po Zharoproch. Splavam, Akad. Nauk SSSR, Inst. Met. Vol. Vol: 8
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ALLOTROPY
CHROMIUM ALLOYS
CORROSION
HARDNESS
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
OXIDATION
SOLID SOLUTIONS
TITANIUM ALLOYS