预氧化对<strong>Co-Al-W</strong>基高温合金高温氧化和热腐蚀行为的影响

doi:10.11900/0412.1961.2019.00032

金属学报

2019, Vol. 55

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

本期目录 | 过刊浏览

预氧化对Co-Al-W基高温合金高温氧化和热腐蚀行为的影响

高博^1,²,王磊^1,²(

),宋秀^1,²,刘杨^1,²,杨舒宇³,千叶晶彦⁴

1. 东北大学材料各向异性与织构教育部重点实验室沈阳 110819
2. 东北大学材料科学与工程学院沈阳 110819
3. 沈阳大学机械工程学院沈阳 110044
4. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

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

引用本文:

高博, 王磊, 宋秀, 刘杨, 杨舒宇, 千叶晶彦. 预氧化对Co-Al-W基高温合金高温氧化和热腐蚀行为的影响[J]. 金属学报, 2019, 55(10): 1273-1281.
Bo GAO, Lei WANG, Xiu SONG, Yang LIU, Shuyu YANG, Akihiko CHIBA. Effect of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Co-Al-W-Based Superalloy[J]. Acta Metall Sin, 2019, 55(10): 1273-1281.

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摘要:

将900 ℃常氧分压(900-PreO)、950 ℃常氧分压(950-PreO)和1000 ℃低氧分压(1000-LPreO)预氧化应用于Co-Al-W基高温合金，研究其高温氧化和热腐蚀行为，利用XRD、SEM和EDS表征了合金氧化层的结构和形貌特征。结果表明，采用900-PreO、950-PreO和1000-LpreO均可获得结构致密的预氧化层。1000 ℃氧化时，900-PreO预氧化层中的Cr₂O₃层进一步氧化而减薄，削弱了其对O及金属元素扩散的阻碍，致使氧化增重与未预氧化合金的情况相近；1000-LPreO预氧化生成的TiTaO₄层易开裂，导致氧化层脱落严重，抗氧化性能较差；而950-PreO预氧化生成的CoCr₂O₄和Al₂O₃层致密且连续，氧化层的保护性强，氧化增重减缓。Co-Al-W基高温合金的热腐蚀中，950-PreO预氧化层中的CoWO₄和Al₂O₃层阻止腐蚀介质进入合金基体，腐蚀增重锐减超过了80%。

关键词 ： Co-Al-W基高温合金, 预氧化, 高温氧化, 热腐蚀, 氧化层

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

收稿日期: 2019-01-31

ZTFLH:

TG146.1

基金资助:国家自然科学基金重点项目(U1708253);国家科技重大专项项目(基础研究)(2017-VI-0002)

作者简介: 高博，男，1991年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00032 或 https://www.ams.org.cn/CN/Y2019/V55/I10/1273

表1 Co-Al-W基高温合金的预氧化制度

图1 不同制度预氧化Co-Al-W基高温合金氧化产物的XRD谱

图2 不同制度预氧化Co-Al-W基高温合金的氧化层背散射电子(BSE)像

图3 未预氧化和不同制度预氧化Co-Al-W基高温合金1000 ℃的氧化动力学曲线

图4 未预氧化和不同制度预氧化Co-Al-W基高温合金经1000 ℃氧化198 h后的氧化层BSE像

图5 NPreO和950-PreO预氧化Co-Al-W基高温合金的腐蚀动力学曲线

表2 NPreO和950-PreO预氧化Co-Al-W基高温合金的平均腐蚀增重速率

图6 NPreO和950-PreO预氧化Co-Al-W基高温合金腐蚀99 h的腐蚀层BSE像

图7 900-PreO和950-PreO预氧化Co-Al-W基高温合金氧化2 h的氧化层BSE像

表3 Co-Al-W基高温合金的Al2O3层厚度

表4 950-PreO预氧化Co-Al-W基高温合金在800和850 ℃腐蚀99 h后CoWO4和Al2O3层厚度

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