Iron-rich low-cost superalloys. [Cr(15)-Mn(15)-Mo(2)-C(1. 5)-Si(1. 0)-Nb(1. 0)-Fe(bal. ) and Cr(20)-Mn(10)-C(3. 4)-Fe(bal. )]

Thesis/Dissertation · Tue Jan 01 00:00:00 EST 1985

OSTI ID:6324561

Wayne, S F

An iron-rich low-cost superalloy has been developed in conjunction with United Technologies Research Center under the NASA program, Conservation of Strategic Aerospace Materials. The alloy, when processed by conventional chill casting, has physical and mechanical properties that compare favorably with existing nickel - and cobalt-based superalloys while containing significantly lower amounts of strategic elements. The composition of the alloy is Cr(15)-Mn(15)-Mo(2)-C(1.5)-Si(1.0)-Nb(1.0)-Fe(bal.), and it can be produced with chromite ore deposits located within the United States. Studies were also made on the properties of Cr(20)-Mn(10)-C(3.4)-Fe(bal.), a eutectic alloy processed by chill casting and directional solidification (D.S.) which produced an aligned microstructure consisting of M/sub 7/C/sub 3/ fibers in an ..gamma..-Fe matrix. This good alignment vanishes when molybdenum or aluminum is added in higher concentrations. Thermal expansion of the M/sub 7/C/sub 3/ (M = Fe, Cr, Mn) carbide lattice was measured up to 800/sup 0/C and found to be highly anisotropic, with the a-axis being the predominant mode of expansion. Repetitive impact-sliding wear experiments performed with the Fe-rich eutectic alloy showed that the directionally solidified microstructure greatly improved the alloy's wear resistance as compared to the chill-cast microstructure and conventional nickel-base superalloys.

• Research Organization: Connecticut Univ., Storrs (USA)
• OSTI ID: 6324561
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
HEAT RESISTING ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MOLYBDENUM ALLOYS
WEAR RESISTANCE
ALLOYS
CRYSTAL STRUCTURE
HEAT RESISTANT MATERIALS
IRON ALLOYS
MATERIALS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties