Characterization of the ξ-carbide in ex-service 1Cr-0.5 Mo steels

S. D. Mann; B. C. Muddle

doi:10.1016/0968-4328(94)90011-6

Characterization of the ξ-carbide in ex-service 1Cr-0.5 Mo steels

S. D. Mann, B. C. Muddle

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

2 Citations (Scopus)

Abstract

The ξ-carbide, also described as Fe₂MoC and M_aC_b, has been identified at ferrite grain boundaries in 1Cr-0.5Mo steels exposed to elevated temperatures (500-530°C) for prolonged periods (65,000-170,000 hr). The structure and composition of the phase have been characterized using electron microdiffraction and energy-dispersive X-ray spectroscopy (EDXS) respectively. Analysis of microdiffraction patterns supports the proposal that the ξ-carbide has a monoclinic unit cell, rather than the orthorhombic unit cell first proposed. The ranges of metallic element concentrations in the ξ-carbide (i.e. 48-59 at.% Fe, 22-29 at.% Mo, 7-16 at.% Cr, 4-7 at.% Mn and 3-6 at.% Si) are unique compared to those of other carbide precipitates identified in the 1Cr-0.5Mo steels, which means that the ξ-carbide may be identified rapidly on extraction replicas using qualitative EDXS.

Original language	English
Pages (from-to)	499-503
Number of pages	5
Journal	Micron
Volume	25
Issue number	6
DOIs	https://doi.org/10.1016/0968-4328(94)90011-6
Publication status	Published - 1 Jan 1994

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title = "Characterization of the ξ-carbide in ex-service 1Cr-0.5 Mo steels",

abstract = "The ξ-carbide, also described as Fe2MoC and MaCb, has been identified at ferrite grain boundaries in 1Cr-0.5Mo steels exposed to elevated temperatures (500-530°C) for prolonged periods (65,000-170,000 hr). The structure and composition of the phase have been characterized using electron microdiffraction and energy-dispersive X-ray spectroscopy (EDXS) respectively. Analysis of microdiffraction patterns supports the proposal that the ξ-carbide has a monoclinic unit cell, rather than the orthorhombic unit cell first proposed. The ranges of metallic element concentrations in the ξ-carbide (i.e. 48-59 at.% Fe, 22-29 at.% Mo, 7-16 at.% Cr, 4-7 at.% Mn and 3-6 at.% Si) are unique compared to those of other carbide precipitates identified in the 1Cr-0.5Mo steels, which means that the ξ-carbide may be identified rapidly on extraction replicas using qualitative EDXS.",

author = "Mann, {S. D.} and Muddle, {B. C.}",

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T1 - Characterization of the ξ-carbide in ex-service 1Cr-0.5 Mo steels

AU - Mann, S. D.

AU - Muddle, B. C.

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N2 - The ξ-carbide, also described as Fe2MoC and MaCb, has been identified at ferrite grain boundaries in 1Cr-0.5Mo steels exposed to elevated temperatures (500-530°C) for prolonged periods (65,000-170,000 hr). The structure and composition of the phase have been characterized using electron microdiffraction and energy-dispersive X-ray spectroscopy (EDXS) respectively. Analysis of microdiffraction patterns supports the proposal that the ξ-carbide has a monoclinic unit cell, rather than the orthorhombic unit cell first proposed. The ranges of metallic element concentrations in the ξ-carbide (i.e. 48-59 at.% Fe, 22-29 at.% Mo, 7-16 at.% Cr, 4-7 at.% Mn and 3-6 at.% Si) are unique compared to those of other carbide precipitates identified in the 1Cr-0.5Mo steels, which means that the ξ-carbide may be identified rapidly on extraction replicas using qualitative EDXS.

AB - The ξ-carbide, also described as Fe2MoC and MaCb, has been identified at ferrite grain boundaries in 1Cr-0.5Mo steels exposed to elevated temperatures (500-530°C) for prolonged periods (65,000-170,000 hr). The structure and composition of the phase have been characterized using electron microdiffraction and energy-dispersive X-ray spectroscopy (EDXS) respectively. Analysis of microdiffraction patterns supports the proposal that the ξ-carbide has a monoclinic unit cell, rather than the orthorhombic unit cell first proposed. The ranges of metallic element concentrations in the ξ-carbide (i.e. 48-59 at.% Fe, 22-29 at.% Mo, 7-16 at.% Cr, 4-7 at.% Mn and 3-6 at.% Si) are unique compared to those of other carbide precipitates identified in the 1Cr-0.5Mo steels, which means that the ξ-carbide may be identified rapidly on extraction replicas using qualitative EDXS.

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Characterization of the ξ-carbide in ex-service 1Cr-0.5 Mo steels

Abstract

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