Effect of surface conditions and alloying elements on the early oxidation behaviour of two austenitic alloys in the pure steam environment

Junjie Chen; Changheui Jang; Qian Xiao; Hyeon Bae Lee; Chaewon Kim; Sung Hwan Kim; Ji Ho Shin; Gokul Obulan Subramanian

doi:10.1016/j.apsusc.2021.150314

Effect of surface conditions and alloying elements on the early oxidation behaviour of two austenitic alloys in the pure steam environment

Junjie Chen, Changheui Jang^*, Qian Xiao, Hyeon Bae Lee, Chaewon Kim, Sung Hwan Kim, Ji Ho Shin, Gokul Obulan Subramanian

^*Corresponding author for this work

Metallurgy and Materials

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

2 Citations (Scopus)

Abstract

The early oxidation behaviour of 347 SS and Alloy 800H with various surface preparation methods, including grinding, mechanical polishing (M−polishing), and electropolishing (E−polishing), were investigated in 650 °C pure steam. For the ground specimens, a protective Cr-rich oxide layer was formed at the M/O interface and lowered the oxidation rate owing to the presence of a nano-crystalline subsurface layer which provided the fast Cr outward diffusion path. On the other hand, M− and E−polished specimens showed significant spallation for 347 SS, while larger weight gain for 800H. Low Cr in 347 SS resulted in the formation of Fe₂O₃ nodules due to easier Cr₂O₃ degradation for ground specimen and the absence of Cr-rich oxide at the internal oxidation zone (IOZ)/matrix interface for M− and E−polished specimens. Higher Cr in 800H contributed to duplex Cr₂O₃ for ground specimen and Cr-rich oxide at IOZ/matrix interface for M− and E−polished specimens. Higher Ni in 800H enhanced Cr outward diffusion and Cr activity at the M/O interface, which improved the oxidation resistance. Low Al content in Alloy 800H showed no positive effect on oxidation resistance due to the Al internal intergranular oxidation.

Original language	English
Article number	150314
Journal	Applied Surface Science
Volume	563
Early online date	10 Jun 2021
DOIs	https://doi.org/10.1016/j.apsusc.2021.150314
Publication status	Published - 15 Oct 2021

Bibliographical note

Funding Information:
This study was mainly supported by the Nuclear R&D Program (no. 2020M2A8A402393721) of the MSIT/NRF of the Rep. of Korea. Part of the funding was provided by Energy Technology R&D Project (no. 20171510101990) of MOTIE/KETEP of the Rep. of Korea. Financial support for three of the authors was in part provided by the BK-Plus Program of the MSIT of the Rep. of Korea. The supports from the KAIST Analysis Center for Research Advancement (KARA) are acknowledged.

Keywords

Oxide layer
Stainless steels
Steam oxidation
Surface preparation

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

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title = "Effect of surface conditions and alloying elements on the early oxidation behaviour of two austenitic alloys in the pure steam environment",

abstract = "The early oxidation behaviour of 347 SS and Alloy 800H with various surface preparation methods, including grinding, mechanical polishing (M−polishing), and electropolishing (E−polishing), were investigated in 650 °C pure steam. For the ground specimens, a protective Cr-rich oxide layer was formed at the M/O interface and lowered the oxidation rate owing to the presence of a nano-crystalline subsurface layer which provided the fast Cr outward diffusion path. On the other hand, M− and E−polished specimens showed significant spallation for 347 SS, while larger weight gain for 800H. Low Cr in 347 SS resulted in the formation of Fe2O3 nodules due to easier Cr2O3 degradation for ground specimen and the absence of Cr-rich oxide at the internal oxidation zone (IOZ)/matrix interface for M− and E−polished specimens. Higher Cr in 800H contributed to duplex Cr2O3 for ground specimen and Cr-rich oxide at IOZ/matrix interface for M− and E−polished specimens. Higher Ni in 800H enhanced Cr outward diffusion and Cr activity at the M/O interface, which improved the oxidation resistance. Low Al content in Alloy 800H showed no positive effect on oxidation resistance due to the Al internal intergranular oxidation.",

keywords = "Oxide layer, Stainless steels, Steam oxidation, Surface preparation",

author = "Junjie Chen and Changheui Jang and Qian Xiao and Lee, {Hyeon Bae} and Chaewon Kim and Kim, {Sung Hwan} and Shin, {Ji Ho} and {Obulan Subramanian}, Gokul",

note = "Funding Information: This study was mainly supported by the Nuclear R&D Program (no. 2020M2A8A402393721) of the MSIT/NRF of the Rep. of Korea. Part of the funding was provided by Energy Technology R&D Project (no. 20171510101990) of MOTIE/KETEP of the Rep. of Korea. Financial support for three of the authors was in part provided by the BK-Plus Program of the MSIT of the Rep. of Korea. The supports from the KAIST Analysis Center for Research Advancement (KARA) are acknowledged.",

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doi = "10.1016/j.apsusc.2021.150314",

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journal = "Applied Surface Science",

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T1 - Effect of surface conditions and alloying elements on the early oxidation behaviour of two austenitic alloys in the pure steam environment

AU - Chen, Junjie

AU - Jang, Changheui

AU - Xiao, Qian

AU - Lee, Hyeon Bae

AU - Kim, Chaewon

AU - Kim, Sung Hwan

AU - Shin, Ji Ho

AU - Obulan Subramanian, Gokul

N1 - Funding Information: This study was mainly supported by the Nuclear R&D Program (no. 2020M2A8A402393721) of the MSIT/NRF of the Rep. of Korea. Part of the funding was provided by Energy Technology R&D Project (no. 20171510101990) of MOTIE/KETEP of the Rep. of Korea. Financial support for three of the authors was in part provided by the BK-Plus Program of the MSIT of the Rep. of Korea. The supports from the KAIST Analysis Center for Research Advancement (KARA) are acknowledged.

PY - 2021/10/15

Y1 - 2021/10/15

N2 - The early oxidation behaviour of 347 SS and Alloy 800H with various surface preparation methods, including grinding, mechanical polishing (M−polishing), and electropolishing (E−polishing), were investigated in 650 °C pure steam. For the ground specimens, a protective Cr-rich oxide layer was formed at the M/O interface and lowered the oxidation rate owing to the presence of a nano-crystalline subsurface layer which provided the fast Cr outward diffusion path. On the other hand, M− and E−polished specimens showed significant spallation for 347 SS, while larger weight gain for 800H. Low Cr in 347 SS resulted in the formation of Fe2O3 nodules due to easier Cr2O3 degradation for ground specimen and the absence of Cr-rich oxide at the internal oxidation zone (IOZ)/matrix interface for M− and E−polished specimens. Higher Cr in 800H contributed to duplex Cr2O3 for ground specimen and Cr-rich oxide at IOZ/matrix interface for M− and E−polished specimens. Higher Ni in 800H enhanced Cr outward diffusion and Cr activity at the M/O interface, which improved the oxidation resistance. Low Al content in Alloy 800H showed no positive effect on oxidation resistance due to the Al internal intergranular oxidation.

AB - The early oxidation behaviour of 347 SS and Alloy 800H with various surface preparation methods, including grinding, mechanical polishing (M−polishing), and electropolishing (E−polishing), were investigated in 650 °C pure steam. For the ground specimens, a protective Cr-rich oxide layer was formed at the M/O interface and lowered the oxidation rate owing to the presence of a nano-crystalline subsurface layer which provided the fast Cr outward diffusion path. On the other hand, M− and E−polished specimens showed significant spallation for 347 SS, while larger weight gain for 800H. Low Cr in 347 SS resulted in the formation of Fe2O3 nodules due to easier Cr2O3 degradation for ground specimen and the absence of Cr-rich oxide at the internal oxidation zone (IOZ)/matrix interface for M− and E−polished specimens. Higher Cr in 800H contributed to duplex Cr2O3 for ground specimen and Cr-rich oxide at IOZ/matrix interface for M− and E−polished specimens. Higher Ni in 800H enhanced Cr outward diffusion and Cr activity at the M/O interface, which improved the oxidation resistance. Low Al content in Alloy 800H showed no positive effect on oxidation resistance due to the Al internal intergranular oxidation.

KW - Oxide layer

KW - Stainless steels

KW - Steam oxidation

KW - Surface preparation

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DO - 10.1016/j.apsusc.2021.150314

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SN - 0169-4332

VL - 563

JO - Applied Surface Science

JF - Applied Surface Science

M1 - 150314

ER -

Effect of surface conditions and alloying elements on the early oxidation behaviour of two austenitic alloys in the pure steam environment

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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