A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron

An as-cast 30wt%Cr-2.3wt%C cast iron was destabilised in the temperature range of 900-1 100°C for times of 2-8 h, followed by air cooling to room temperature. The resultant microstructures were examined using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microsc...

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Main Authors: Wiengmoon A., Chairuangsri T., Pearce J.T.H.
Format: Article
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-1942473836&partnerID=40&md5=8d800299d2c94377718f3e49fbd7f406
http://cmuir.cmu.ac.th/handle/6653943832/7138
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-71382014-08-30T03:51:37Z A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron Wiengmoon A. Chairuangsri T. Pearce J.T.H. An as-cast 30wt%Cr-2.3wt%C cast iron was destabilised in the temperature range of 900-1 100°C for times of 2-8 h, followed by air cooling to room temperature. The resultant microstructures were examined using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Volume fractions of secondary carbide within the martensite matrix and of M23C6 in eutectic carbides were determined. Vickers macrohardness and Vickers microhardness of the dendritic regions were also measured. It was found that morphologies of secondary carbide were cube, plate-like shape or discrete-rod. A duplex core-shell structure was found in the eutectic carbides after destabilisation. It consists of M7C 3 as a core surrounding by M23C6, while the secondary carbide in these alloys was identified as M23C6. Higher destabilisation temperatures resulted in coarser secondary carbides with comparable volume fraction, but less in counts per area. The volume fraction of M23C6 within the duplex structure was also increased when increasing destabilisation temperature and time. The results from hardness measurements revealed that the overall macrohardness of the iron was increased with increasing the destabilisation temperature up to about 770 HV (30 kgf/15 s) at 1 025°C, whereas the microhardness of the dendritic regions reached the maximum value of 800 HV (100 gf/15 s) at about 1 025°C. 2014-08-30T03:51:37Z 2014-08-30T03:51:37Z 2004 Article 09151559 IINTE http://www.scopus.com/inward/record.url?eid=2-s2.0-1942473836&partnerID=40&md5=8d800299d2c94377718f3e49fbd7f406 http://cmuir.cmu.ac.th/handle/6653943832/7138 English
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
language English
description An as-cast 30wt%Cr-2.3wt%C cast iron was destabilised in the temperature range of 900-1 100°C for times of 2-8 h, followed by air cooling to room temperature. The resultant microstructures were examined using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Volume fractions of secondary carbide within the martensite matrix and of M23C6 in eutectic carbides were determined. Vickers macrohardness and Vickers microhardness of the dendritic regions were also measured. It was found that morphologies of secondary carbide were cube, plate-like shape or discrete-rod. A duplex core-shell structure was found in the eutectic carbides after destabilisation. It consists of M7C 3 as a core surrounding by M23C6, while the secondary carbide in these alloys was identified as M23C6. Higher destabilisation temperatures resulted in coarser secondary carbides with comparable volume fraction, but less in counts per area. The volume fraction of M23C6 within the duplex structure was also increased when increasing destabilisation temperature and time. The results from hardness measurements revealed that the overall macrohardness of the iron was increased with increasing the destabilisation temperature up to about 770 HV (30 kgf/15 s) at 1 025°C, whereas the microhardness of the dendritic regions reached the maximum value of 800 HV (100 gf/15 s) at about 1 025°C.
format Article
author Wiengmoon A.
Chairuangsri T.
Pearce J.T.H.
spellingShingle Wiengmoon A.
Chairuangsri T.
Pearce J.T.H.
A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron
author_facet Wiengmoon A.
Chairuangsri T.
Pearce J.T.H.
author_sort Wiengmoon A.
title A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron
title_short A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron
title_full A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron
title_fullStr A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron
title_full_unstemmed A Microstructural Study of Destabilised 30wt%Cr-2.3wt%C High Chromium Cast Iron
title_sort microstructural study of destabilised 30wt%cr-2.3wt%c high chromium cast iron
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-1942473836&partnerID=40&md5=8d800299d2c94377718f3e49fbd7f406
http://cmuir.cmu.ac.th/handle/6653943832/7138
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