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

Abstract

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.

Authors:
;  [1]
  1. Univ. of Windsor, Ontario (Canada)
Publication Date:
OSTI Identifier:
6354449
Resource Type:
Journal Article
Journal Name:
Materials Characterization; (United States)
Additional Journal Information:
Journal Volume: 31:1; Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON; METALLURGICAL EFFECTS; NICKEL-CHROMIUM STEELS; MICROSTRUCTURE; NIOBIUM ALLOYS; AGING; AUSTENITE; CARBON ADDITIONS; CHROMIUM CARBIDES; CORRELATIONS; CREEP; EUTECTICS; GRAIN BOUNDARIES; HEAT RESISTING ALLOYS; NIOBIUM CARBIDES; TENSILE PROPERTIES; ALLOYS; CARBIDES; CARBON COMPOUNDS; CHROMIUM ALLOYS; CHROMIUM COMPOUNDS; ELEMENTS; HEAT RESISTANT MATERIALS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MECHANICAL PROPERTIES; NICKEL ALLOYS; NICKEL STEELS; NIOBIUM COMPOUNDS; NONMETALS; REFRACTORY METAL COMPOUNDS; STEELS; TRANSITION ELEMENT COMPOUNDS; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Wang, F, and Northwood, D O. The effect of carbon content on the microstructure of an experimental heat-resistant steel. United States: N. p., 1993. Web. doi:10.1016/1044-5803(93)90039-X.
Wang, F, & Northwood, D O. The effect of carbon content on the microstructure of an experimental heat-resistant steel. United States. doi:10.1016/1044-5803(93)90039-X.
Wang, F, and Northwood, D O. Thu . "The effect of carbon content on the microstructure of an experimental heat-resistant steel". United States. doi:10.1016/1044-5803(93)90039-X.
@article{osti_6354449,
title = {The effect of carbon content on the microstructure of an experimental heat-resistant steel},
author = {Wang, F and Northwood, D O},
abstractNote = {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.},
doi = {10.1016/1044-5803(93)90039-X},
journal = {Materials Characterization; (United States)},
issn = {1044-5803},
number = ,
volume = 31:1,
place = {United States},
year = {1993},
month = {7}
}