Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons

20wt%Cr and 27wt%Cr oast irons were destabilised at 1000°C for 4 hours, followed by air cooling to room temperature. The as-cast microstructure of 20%Cr iron consisted of eutectic M<inf>7</inf>C<inf>3</inf> carbide, primary austenite (γ) dendrites with some pearlite structure...

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Main Authors: Amporn Wiengmoon, Torranin Chairuangsri, Nattaphol Chomsaeng, John T H Pearce
Format: Conference Proceeding
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/60446
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-604462018-09-10T03:48:58Z Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons Amporn Wiengmoon Torranin Chairuangsri Nattaphol Chomsaeng John T H Pearce Engineering Materials Science Physics and Astronomy 20wt%Cr and 27wt%Cr oast irons were destabilised at 1000°C for 4 hours, followed by air cooling to room temperature. The as-cast microstructure of 20%Cr iron consisted of eutectic M<inf>7</inf>C<inf>3</inf> carbide, primary austenite (γ) dendrites with some pearlite structure and eutectic austenite. The as-cast 27%Cr iron contained eutectic M<inf>7</inf>C<inf>3</inf> carbide, primary austenite dendrites and eutectic austenite which had partially transformed to martensite (α) during cooling in the mold. After destabilisation, the microstructure of both irons consisted of precipitated secondary carbides within a martensite matrix, with the eutectic carbides remaining unchanged. The type of the secondary carbide was M<inf>7</inf>C<inf>3</inf> in the 20wt%Cr iron and both M<inf>7</inf>C<inf>3</inf> and M<inf>7</inf>C<inf>3</inf> for the 27wt%Cr iron. Size and volume fraction of secondary carbide in the 20wt%Cr iron were higher than for the 27wt%Cr iron. After destabilisation, the hardness and corrosion resistance were increased for both irons. Anodic polarisation curves used to indicate corrosion resistance showed that the 27wt%Cr iron possessed a slightly wider passive range than the 20wt%Cr iron. 2018-09-10T03:42:40Z 2018-09-10T03:42:40Z 2008-01-01 Conference Proceeding 2-s2.0-84928229225 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84928229225&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/60446
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Engineering
Materials Science
Physics and Astronomy
spellingShingle Engineering
Materials Science
Physics and Astronomy
Amporn Wiengmoon
Torranin Chairuangsri
Nattaphol Chomsaeng
John T H Pearce
Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons
description 20wt%Cr and 27wt%Cr oast irons were destabilised at 1000°C for 4 hours, followed by air cooling to room temperature. The as-cast microstructure of 20%Cr iron consisted of eutectic M<inf>7</inf>C<inf>3</inf> carbide, primary austenite (γ) dendrites with some pearlite structure and eutectic austenite. The as-cast 27%Cr iron contained eutectic M<inf>7</inf>C<inf>3</inf> carbide, primary austenite dendrites and eutectic austenite which had partially transformed to martensite (α) during cooling in the mold. After destabilisation, the microstructure of both irons consisted of precipitated secondary carbides within a martensite matrix, with the eutectic carbides remaining unchanged. The type of the secondary carbide was M<inf>7</inf>C<inf>3</inf> in the 20wt%Cr iron and both M<inf>7</inf>C<inf>3</inf> and M<inf>7</inf>C<inf>3</inf> for the 27wt%Cr iron. Size and volume fraction of secondary carbide in the 20wt%Cr iron were higher than for the 27wt%Cr iron. After destabilisation, the hardness and corrosion resistance were increased for both irons. Anodic polarisation curves used to indicate corrosion resistance showed that the 27wt%Cr iron possessed a slightly wider passive range than the 20wt%Cr iron.
format Conference Proceeding
author Amporn Wiengmoon
Torranin Chairuangsri
Nattaphol Chomsaeng
John T H Pearce
author_facet Amporn Wiengmoon
Torranin Chairuangsri
Nattaphol Chomsaeng
John T H Pearce
author_sort Amporn Wiengmoon
title Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons
title_short Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons
title_full Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons
title_fullStr Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons
title_full_unstemmed Effects of heat treatment oil microstructure and properties of 20wt%Cr and 27wt%Cr white cast irons
title_sort effects of heat treatment oil microstructure and properties of 20wt%cr and 27wt%cr white cast irons
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84928229225&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/60446
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