The effect of carbon content on the microstructure of an experimental heat-resistant steel

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Materials Characterization; (United States)

DOI:https://doi.org/10.1016/1044-5803(93)90039-X· OSTI ID:6354449

Wang, F; Northwood, D O ^[1]

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1. Univ. of Windsor, Ontario (Canada)

The effect of carbon content on the microstructure of a HP-Nb type heat-resistant steel (35Ni-25Cr-1Nb) is examined for carbon contents of 0.35, 0.44, 0.56, and 0.62 wt%. In the cast state, the alloys contain both eutectic Cr[sub 7]C[sub 3] and eutectic NbC. Upon aging, Cr[sub 23]C[sub 6] carbides precipitate out from the supersaturated austenite. The distribution of the Cr[sub 23]C[sub 6] carbides was better, that is, more uniform, in the alloys containing 0.44 or 0.56 wt.%C than in the alloys containing 0.35 or 0.62 wt.%C. Both the amount of the eutectic Cr[sub 7]C[sub 3] carbides at the grain boundaries, and the Cr[sub 23]C[sub 6] carbides within the grains, increased with increasing carbon content. The relationship between the microstructures developed and the creep and high-temperature tensile properties is briefly discussed.

• OSTI ID: 6354449
• Journal Information: Materials Characterization; (United States), Journal Name: Materials Characterization; (United States) Vol. 31:1; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
AGING
ALLOYS
AUSTENITE
CARBIDES
CARBON
CARBON ADDITIONS
CARBON COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM CARBIDES
CHROMIUM COMPOUNDS
CORRELATIONS
CREEP
ELEMENTS
EUTECTICS
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL STEELS
NICKEL-CHROMIUM STEELS
NIOBIUM ALLOYS
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
NONMETALS
REFRACTORY METAL COMPOUNDS
STEELS
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS