Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys
The oxidation behavior of Ni−9.5Co−(8~12)Cr−(2.5~5.5)Mo−(4~8)W−3Al−5Ti−3Ta−0.1C−0.01B alloys was investigated at 850 °C and 1000 °C The mass change, the phase of oxides, and the cross-sectiona...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2019-09-01
|
Series: | Materials |
Subjects: | |
Online Access: | https://www.mdpi.com/1996-1944/12/18/2934 |
id |
doaj-28498f1ff8b44e888cc4df413774b90c |
---|---|
record_format |
Article |
spelling |
doaj-28498f1ff8b44e888cc4df413774b90c2020-11-25T00:59:16ZengMDPI AGMaterials1996-19442019-09-011218293410.3390/ma12182934ma12182934Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based SuperalloysSi-Jun Park0Seong-Moon Seo1Young-Soo Yoo2Hi-Won Jeong3HeeJin Jang4Multi-Material Research Center, Gwangju-Jeonnam Division, Korea Automotive Technology Institute, 55 Jingok-sandan-jungangro, Gwangsan-gu, Gwangju 62207, KoreaHigh Temperature Materials Group, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon 51508, KoreaHigh Temperature Materials Group, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon 51508, KoreaHigh Temperature Materials Group, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon 51508, KoreaDepartment of Materials Science and Engineering, Chosun University, 309 Pilmundaero, Dong-gu, Gwangju 61452, KoreaThe oxidation behavior of Ni−9.5Co−(8~12)Cr−(2.5~5.5)Mo−(4~8)W−3Al−5Ti−3Ta−0.1C−0.01B alloys was investigated at 850 °C and 1000 °C The mass change, the phase of oxides, and the cross-sectional structure of specimens were analyzed after cyclic oxidation tests. The oxide scale was composed mainly of Cr<sub>2</sub>O<sub>3</sub> and NiCr<sub>2</sub>O<sub>4</sub>, but NiO, TiO<sub>2</sub>, and CrTaO<sub>4</sub> were also found. Al<sub>2</sub>O<sub>3</sub> was formed beneath the Cr oxide layer. The Cr oxide layer and internal Al oxide acted as barriers to oxidation at 850 °C, while Al oxide was predominantly protective at 1000 °C. Cr increased the mass gain after oxidation test at both temperatures. Mo increased the oxidation rate at 850 °C but decreased the oxidation rate at 1000 °C. W slightly increased the mass gain at 850 °C but did not produce a significant effect at 1000 °C. The effects of Cr, Mo, W, and the temperature were discussed as well as the volatilization of oxides, the valence number of elements, and diffusion retardation.https://www.mdpi.com/1996-1944/12/18/2934high temperature oxidationalloying elementNi-based superalloycyclic oxidation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Si-Jun Park Seong-Moon Seo Young-Soo Yoo Hi-Won Jeong HeeJin Jang |
spellingShingle |
Si-Jun Park Seong-Moon Seo Young-Soo Yoo Hi-Won Jeong HeeJin Jang Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys Materials high temperature oxidation alloying element Ni-based superalloy cyclic oxidation |
author_facet |
Si-Jun Park Seong-Moon Seo Young-Soo Yoo Hi-Won Jeong HeeJin Jang |
author_sort |
Si-Jun Park |
title |
Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys |
title_short |
Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys |
title_full |
Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys |
title_fullStr |
Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys |
title_full_unstemmed |
Effects of Cr, W, and Mo on the High Temperature Oxidation of Ni-Based Superalloys |
title_sort |
effects of cr, w, and mo on the high temperature oxidation of ni-based superalloys |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-09-01 |
description |
The oxidation behavior of Ni−9.5Co−(8~12)Cr−(2.5~5.5)Mo−(4~8)W−3Al−5Ti−3Ta−0.1C−0.01B alloys was investigated at 850 °C and 1000 °C The mass change, the phase of oxides, and the cross-sectional structure of specimens were analyzed after cyclic oxidation tests. The oxide scale was composed mainly of Cr<sub>2</sub>O<sub>3</sub> and NiCr<sub>2</sub>O<sub>4</sub>, but NiO, TiO<sub>2</sub>, and CrTaO<sub>4</sub> were also found. Al<sub>2</sub>O<sub>3</sub> was formed beneath the Cr oxide layer. The Cr oxide layer and internal Al oxide acted as barriers to oxidation at 850 °C, while Al oxide was predominantly protective at 1000 °C. Cr increased the mass gain after oxidation test at both temperatures. Mo increased the oxidation rate at 850 °C but decreased the oxidation rate at 1000 °C. W slightly increased the mass gain at 850 °C but did not produce a significant effect at 1000 °C. The effects of Cr, Mo, W, and the temperature were discussed as well as the volatilization of oxides, the valence number of elements, and diffusion retardation. |
topic |
high temperature oxidation alloying element Ni-based superalloy cyclic oxidation |
url |
https://www.mdpi.com/1996-1944/12/18/2934 |
work_keys_str_mv |
AT sijunpark effectsofcrwandmoonthehightemperatureoxidationofnibasedsuperalloys AT seongmoonseo effectsofcrwandmoonthehightemperatureoxidationofnibasedsuperalloys AT youngsooyoo effectsofcrwandmoonthehightemperatureoxidationofnibasedsuperalloys AT hiwonjeong effectsofcrwandmoonthehightemperatureoxidationofnibasedsuperalloys AT heejinjang effectsofcrwandmoonthehightemperatureoxidationofnibasedsuperalloys |
_version_ |
1725218275213705216 |