Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron

A semi-solid processed 27 wt%Cr cast iron was studied by electron microscopy and its microstructure was related to the hardness. In the as-cast condition, the primary proeutectic austenite was round in shape while the eutectic M7C3carbide was found as radiating clusters mixed with directional cluste...

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Main Authors: A. Wiengmoon, T. Chairuangsri, N. Poolthong, J. T H Pearce
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/60516
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-605162018-09-10T03:44:11Z Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron A. Wiengmoon T. Chairuangsri N. Poolthong J. T H Pearce Materials Science A semi-solid processed 27 wt%Cr cast iron was studied by electron microscopy and its microstructure was related to the hardness. In the as-cast condition, the primary proeutectic austenite was round in shape while the eutectic M7C3carbide was found as radiating clusters mixed with directional clusters. Growth in the [0 0 1]M7C3with planar faces of {0 2 0}M7C3and { 2 over(4, ̄) 0 } M7C3was usually observed with an encapsulated core of austenite. Destabilisation heat treatment followed by air cooling led to a precipitation of secondary M23C6carbide and a transformation of the primary austenite to martensite in the semi-solid processed iron. Precipitation behaviour is comparable to that observed in the destabilisation of conventional cast iron. However, the nucleation of secondary M23C6carbide on the eutectic M7C3carbide was observed for the first time. Tempering after destabilisation led to further precipitation of carbide within the tempered martensite in the eutectic structure. The maximum hardness was obtained after destabilisation and tempering heat treatment due to the precipitation of secondary carbides within the martensite matrix and a possible reduction in the retained austenite. © 2007 Elsevier B.V. All rights reserved. 2018-09-10T03:44:11Z 2018-09-10T03:44:11Z 2008-05-15 Journal 09215093 2-s2.0-41149130357 10.1016/j.msea.2007.07.043 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=41149130357&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/60516
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Materials Science
spellingShingle Materials Science
A. Wiengmoon
T. Chairuangsri
N. Poolthong
J. T H Pearce
Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron
description A semi-solid processed 27 wt%Cr cast iron was studied by electron microscopy and its microstructure was related to the hardness. In the as-cast condition, the primary proeutectic austenite was round in shape while the eutectic M7C3carbide was found as radiating clusters mixed with directional clusters. Growth in the [0 0 1]M7C3with planar faces of {0 2 0}M7C3and { 2 over(4, ̄) 0 } M7C3was usually observed with an encapsulated core of austenite. Destabilisation heat treatment followed by air cooling led to a precipitation of secondary M23C6carbide and a transformation of the primary austenite to martensite in the semi-solid processed iron. Precipitation behaviour is comparable to that observed in the destabilisation of conventional cast iron. However, the nucleation of secondary M23C6carbide on the eutectic M7C3carbide was observed for the first time. Tempering after destabilisation led to further precipitation of carbide within the tempered martensite in the eutectic structure. The maximum hardness was obtained after destabilisation and tempering heat treatment due to the precipitation of secondary carbides within the martensite matrix and a possible reduction in the retained austenite. © 2007 Elsevier B.V. All rights reserved.
format Journal
author A. Wiengmoon
T. Chairuangsri
N. Poolthong
J. T H Pearce
author_facet A. Wiengmoon
T. Chairuangsri
N. Poolthong
J. T H Pearce
author_sort A. Wiengmoon
title Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron
title_short Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron
title_full Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron
title_fullStr Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron
title_full_unstemmed Electron microscopy and hardness study of a semi-solid processed 27 wt%Cr cast iron
title_sort electron microscopy and hardness study of a semi-solid processed 27 wt%cr cast iron
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=41149130357&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/60516
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