定向凝固合金DZ466在涂NaCl/Na<sub>2</sub>SO<sub>4</sub>鹽條件下熱腐蝕行為

丁賢飛; 陳學達; 李青; 肖程波; 任維鵬; 馮強

doi:10.13374/j.issn2095-9389.2015.05.011

定向凝固合金DZ466在涂NaCl/Na₂SO₄鹽條件下熱腐蝕行為

doi: 10.13374/j.issn2095-9389.2015.05.011

丁賢飛¹,
陳學達^1,2,
李青³,
肖程波³,
任維鵬³,
馮強^1,4, ,

1. 北京科技大學國家材料服役安全科學中心, 北京 100083;
2. 東方汽輪機有限公司材料研究中心, 德陽 618000;
3. 北京航空材料研究院先進高溫結構材料國防科技重點實驗室北京 100095;
4. 北京科技大學新金屬材料國家重點實驗室, 北京 100083

基金項目:

中央高校基本科研業務費資助項目(FRF-TP-14-062A2)

國家高技術研究發展計劃資助項目(2012AA03A511)

詳細信息

通訊作者:
馮強,E-mail:qfeng@skl.ustb.edu.cn

中圖分類號: TG174.2⁺2;TG172.6
計量
- 文章訪問數: 204
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- 被引次數: 0
出版歷程
- 收稿日期: 2015-03-03
- 網絡出版日期: 2021-07-10

Salt-deposit hot corrosion behaviors of directionally solidified DZ466 superalloy

1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
2. Material Research Center, Dongfang Turbine Co. Ltd., Deyang 618000, China;
3. National Key Laboratory of Science and Technology on Advanced High Temperature Structural Material Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
4. State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要:
采用涂Na Cl/Na₂SO₄鹽方法研究了DZ466合金在850℃和950℃條件下熱腐蝕行為.結果表明:合金的腐蝕層包括三個區域,最外層為(Ni,Co)O氧化物層,次外層為尖晶石結構氧化層(Ni,Co)Cr₂O₄,內層為內腐蝕層,850℃時該層為Ni₃S₂,而950℃時除Ni₃S₂外,在靠近次外層還形成內氧化Al₂O₃;在850℃和950℃時合金的熱腐蝕機制相同,氧化膜連續性的破壞,是合金遭受熱腐蝕的主要原因;熱腐蝕增重曲線均符合拋物線規律,其速率常數分別為3.1×10^-11g²·cm^-4·s^-1和1.5×10^-9g²·cm^-4·s^-1,熱腐蝕激活能分別為179.2 k J·mol^-1和138.3 k J·mol^-1.
- 高溫合金 /
- 定向凝固 /
- 涂鹽 /
- 熱腐蝕 /
- 腐蝕膜
Abstract:
Hot corrosion behaviors of DZ466 alloy at 850℃ and 950℃ were investigated by using a NaCl/Na₂SO₄salt-deposit method. It is found that there are three corrosion layers on the alloy. The outer and the middle layers consist of(Ni,Co) O oxide and(Ni,Co) Cr₂O₄ with a spinel structure,respectively. The innermost layer is an inner corrosion layer,which consists of Ni₃S₂ at 850℃,and the internal oxidation Al₂O₃ can be produced close to the middle layer at 950℃. The same hot corrosion mechanism is shown at 850℃ and 950℃. The destruction of the oxidation film continuity is a key reason for hot corrosion of the alloy. The hot corrosion weight gain curves obey a parabolic law at the two temperatures,the rate constants are 3.1×10^-11g²·cm^-4·s^-1 and 1.5 × 10^-9g²·cm^-4·s^-1,and the hot corrosion activation energies are 179.2 and 138.3 kJ ·mol-1at 850℃ and 950℃,respectively.
- superalloys /
- directional solidification /
- salt deposits /
- hot corrosion /
- corrosion films