Effect of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Co-Al-W-Based Superalloy

doi:10.11900/0412.1961.2019.00032

Acta Metall Sin

2019, Vol. 55

Issue (10): 1273-1281 DOI: 10.11900/0412.1961.2019.00032

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Effect of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Co-Al-W-Based Superalloy

GAO Bo^1,²,WANG Lei^1,²(

),SONG Xiu^1,²,LIU Yang^1,²,YANG Shuyu³,CHIBA Akihiko⁴

1. Key Lab for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3. College of Mechanical Engineering, Shenyang University, Shenyang 110044, China
4. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Cite this article:

GAO Bo, WANG Lei, SONG Xiu, LIU Yang, YANG Shuyu, CHIBA Akihiko. Effect of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Co-Al-W-Based Superalloy. Acta Metall Sin, 2019, 55(10): 1273-1281.

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Abstract

In 2006, stable γ' phase was found in Co-Al-W alloy, which provides a new way for developing Co-based superalloys. In order to meet the requirements for applications, the Co-Al-W-based superalloys need to have good oxidation and corrosion resistance. But the oxidation and corrosion resistance of the Co-Al-W-based superalloys is relatively low. In this work, pre-oxidation treatments were used to improve the oxidation and corrosion resistance. Three types of pre-oxidation treatments were carried out at 900 ℃ (in air), 950 ℃ (in air) and 1000 ℃ (in 1%O₂+99%Ar), which were marked as 900-PreO, 950-PreO and 1000-LPreO, respectively. High temperature oxidation tests of both the pre-oxidation treated and untreated superalloys were carried out at 1000 ℃. And hot corrosion behaviors were also investigated at both 800 and 850 ℃. XRD, SEM and EDS were used to examine the characteristics of the oxidation and corrosion behaviors. The results show that the pre-oxide layers of the superalloys after different pre-oxidation treatments are compact. During oxidation at 1000 ℃, the Cr₂O₃scale in 900-PreO treated superalloy is oxidized to form volatile products, and the diffusion resistance of both oxygen and the metal elements through the oxide layer is poor. In 1000-LPreO treated superalloy, serious spallation of the oxides occurs and leads to poor oxidation resistance. In 950-PreO treated superalloy, since the continuous CoCr₂O₄ and Al₂O₃ scales help to reduce the diffusion of oxygen and the metal elements, the mass gain of 950-PreO treated superalloy is consequently decreased. During the hot corrosion process, the pre-oxide layer of 950-PreO treated superalloy can hinder the diffusion of corrosive medium. Therefore, the corrosion resistance can be significantly improved by 950-PreO treatment, and the mass gain is decreased by over 80%.

Key words: Co-Al-W-based superalloy pre-oxidation high temperature oxidation hot corrosion oxide layer

Received: 31 January 2019

ZTFLH:

TG146.1

Fund: Supported by National Natural Science Foundation of China(U1708253);National Science and Technology Major Project(2017-VI-0002)

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	Bo GAO
	Lei WANG
	Xiu SONG
	Yang LIU
	Shuyu YANG
	Akihiko CHIBA

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00032 OR https://www.ams.org.cn/EN/Y2019/V55/I10/1273

Table 1 Pre-oxidation treatment for Co-Al-W-based superalloy

Fig.1 XRD spectra of the oxide products in Co-Al-W-based superalloys after 900-PreO (a), 950-PreO (b) and 1000-LPreO (c) treatments

Fig.2 Back-scattered electron (BSE) images of the oxide layer in Co-Al-W-based superalloy after 900-PreO (a), 950-PreO (b) and 1000-LPreO (c) treatments (Dash lines in Figs.2b and c show the boundaries between Cr₂O₃ and CoCr₂O₄)

Fig.3 Mass gain curves of Co-Al-W-based superalloys before and after different pre-oxidation treatments at 1000 ℃ (NPreO—no pre-oxidation)

Fig.4 BSE images of the oxide layer in Co-Al-W-based superalloy before and after different pre-oxidation treatments oxidized at 1000 ℃ for 198 h

Fig.5 Mass gain curves of Co-Al-W-based superalloys exposed to 75%Na₂SO₄+25%NaCl at 800 and 850 ℃

Table 2 Average mass gain rates of NPreO和950-PreO treated Co-Al-W-based superalloys exposed to 75%Na₂SO₄+25%NaCl

Fig.6 BSE images of the oxide layer in NPreO (a, c) and 950-PreO (b, d) treated Co-Al-W-based superalloy exposed to 75%Na₂SO₄+25%NaCl at 800 ℃ (a, b) and 850 ℃ (c, d) for 99 h

Fig.7 BSE images of the oxide layer in 900-PreO (a) and 950-PreO (b) treated Co-Al-W-based superalloy oxidized at 1000 ℃ for 2 h (Insets show the EDS mappings)

Table 3 Mean Al₂O₃ scale thicknesses of Co-Al-W-based superalloy

Table 4 Mean CoWO₄ and Al₂O₃ scale thicknesses of Co-Al-W-based superalloy after 950-PreO treatment and hot corrosion at 800 and 850 ℃ for 99 h

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