T92钢表面渗铝层制备及其耐高温水蒸气氧化

doi:10.13251/j.issn.0254-6051.2025.09.005

金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 27-33.DOI: 10.13251/j.issn.0254-6051.2025.09.005

T92钢表面渗铝层制备及其耐高温水蒸气氧化

龚兵兵, 刘光明, 刘帅岐, 胡梓轩, 师超, 张帮彦

南昌航空大学材料科学与工程学院, 江西南昌 330063

收稿日期:2025-03-27 修回日期:2025-07-11 出版日期:2025-09-25 发布日期:2025-10-13
通讯作者: 刘光明,教授,博士,E-mail: gemliu@126.com
作者简介:龚兵兵(1996—),男,硕士,主要研究方向为表面处理,E-mail: 3354756134@qq.com。
基金资助:
国家自然科学基金(51961028);江西省研究生创新基金(YC2021-005)

Preparation of aluminized layer on surface of T92 steel and its resistance to water vapour oxidation at high temperature

Gong Bingbing, Liu Guangming, Liu Shuaiqi, Hu Zixuan, Shi Chao, Zhang Bangyan

School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang Jiangxi 330063, China

Received:2025-03-27 Revised:2025-07-11 Online:2025-09-25 Published:2025-10-13

摘要/Abstract

摘要： 利用料浆渗铝法在T92钢表面制备渗铝层及Si改性渗铝层,将其置于高温水蒸气中氧化(650 ℃×2000 h、725 ℃×200 h),采用X射线衍射、扫描电镜(SEM)及能谱仪(EDS)对氧化产物的物相组成、形貌和成分进行分析,研究其在高温水蒸气下的氧化行为。结果表明,650 ℃和725 ℃氧化后,渗铝层及Si改性渗铝层均有良好的抗高温氧化能力,Si改性渗铝层比未加Si改性的渗铝层新生长出的内层厚度薄,但Si改性渗铝层与基体之间出现明显裂纹。650 ℃氧化后Si改性渗铝试样氧化质量增加最少,而725 ℃氧化质量增加较渗铝试样快。Si改性渗铝层中富Si的τ₁(Fe₃Si₃Al₂)相降低了Al原子的内扩散速率,但Fe原子的外扩散速率降低不明显,由于柯肯达尔效应(Kirkendall effect),在Si改性渗铝层与基体之间产生裂纹。温度升高,加剧了柯肯达尔效应,725 ℃氧化后Si改性渗铝层出现开裂,少部分渗层脱落,失去对基体的保护作用,氧化质量增加较快。

关键词: T92钢, 料浆渗铝, 渗铝层, 高温水蒸气氧化, Si改性

Abstract: The aluminized layer and Si-modified aluminized layer were prepared on the surface of T92 steel by slurry aluminizing method, and then were oxidized in high-temperature water vapour (650 ℃×2000 h, 725 ℃×200 h), and the phase composition, morphology and composition of the oxidation products were analyzed by X-ray diffraction, scanning electron microscopy (SEM) and energy spectrometer (EDS), and their oxidation behaviour at high temperature water vapour was studied. The results show that in water vapour environment at 650 ℃ and 725 ℃, both the aluminized layer and the Si-modified aluminized layer exhibite excellent resistance to high-temperature oxidation. The Si-modified aluminized layer is thinner than the newly grown inner layer of the non-Si-modified aluminized layer, but there are obvious cracks between the Si-modified aluminized layer and the substrate. The oxidation mass of the Si-modified aluminized specimen increases the least after oxidation at 650 ℃, while that increases faster at 725 ℃ than that of the aluminized specimens. The Si-rich τ₁(Fe₃Si₃Al₂) phase in the Si-modified aluminized layer reduces the internal diffusion rate of Al atoms, but the outer diffusion rate of Fe atoms is not significantly reduced, resulting in cracks between the Si-modified aluminized layer and the substrate due to the Kirkendall effect. The increase in temperature exacerbates the Kirkendall effect. After oxidation at 725 ℃, the Si-modified aluminized layer cracks, a small part of the aluminized layer falls off and loses its protective effect on the substrate, and the oxidation mass increases rapidly.

Key words: T92 steel, slurry aluminizing, aluminized layer, high-temperature water vapor oxidation, Si-modification

中图分类号:

TG156.8⁺6

龚兵兵, 刘光明, 刘帅岐, 胡梓轩, 师超, 张帮彦. T92钢表面渗铝层制备及其耐高温水蒸气氧化[J]. 金属热处理, 2025, 50(9): 27-33.

Gong Bingbing, Liu Guangming, Liu Shuaiqi, Hu Zixuan, Shi Chao, Zhang Bangyan. Preparation of aluminized layer on surface of T92 steel and its resistance to water vapour oxidation at high temperature[J]. Heat Treatment of Metals, 2025, 50(9): 27-33.

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T92钢表面渗铝层制备及其耐高温水蒸气氧化

Preparation of aluminized layer on surface of T92 steel and its resistance to water vapour oxidation at high temperature

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