K438铸造高温合金表面热浸镀铝涂层的抗氧化性能

doi:10.13251/j.issn.0254-6051.2021.11.037

金属热处理 ›› 2021, Vol. 46 ›› Issue (11): 207-212.DOI: 10.13251/j.issn.0254-6051.2021.11.037

K438铸造高温合金表面热浸镀铝涂层的抗氧化性能

邓鹏飞¹, 左林春¹, 陈星伟¹, 熊伟¹, 刘艳¹, 廖从来², 李智¹

1.湘潭大学材料科学与工程学院, 湖南湘潭 411105;
2.湖南江滨机器集团有限责任公司, 湖南湘潭 411105

收稿日期:2021-08-21 出版日期:2021-11-25 发布日期:2021-12-08
通讯作者: 李智,教授,博士,E-mail:lizhiclsj@163.com
作者简介:邓鹏飞(1996—),男,硕士研究生,主要研究方向为金属材料表面处理,E-mail:373318021@qq.com
基金资助:
国家自然科学基金(51971189);湖南省自然科学基金株洲联合基金(2019JJ60011);湘潭大学生创新训练项目

Oxidation resistance of hot-dip aluminized coating on cast K438 superalloy

Deng Pengfei¹, Zuo Linchun¹, Chen Xingwei¹, Xiong Wei¹, Liu Yan¹, Liao Conglai², Li Zhi¹

1. School of Materials Science and Engineering, Xiangtan University, Xiangtan Hunan 411105, China;
2. Hunan Jiangbin Machinery (Group) Co., Ltd., Xiangtan Hunan 411105, China

Received:2021-08-21 Online:2021-11-25 Published:2021-12-08

摘要/Abstract

摘要： 针对K438镍基高温合金在高温条件下抗氧化性能不足的问题,采用热浸镀铝技术在其表面制备了铝化物涂层。经1000 ℃、1 h真空扩散退火处理后,对高温合金的热浸镀铝涂层开展了1000 ℃、250次的高温循环氧化试验,并采用扫描电镜、能谱仪、X射线衍射仪等分析测试手段,对高温氧化后涂层截面组织进行了研究。结果表明,试验合金在1000 ℃、40次循环氧化后氧化增量曲线便开始下降,高温抗氧化性能较差,经1000 ℃、250次循环氧化后,形成了Al₂O₃、TiO₂、Cr₂O₃、NiO和尖晶石NiCr₂O₄、NiAl₂O₄等氧化产物。而热浸镀铝涂层经1000 ℃、40次循环氧化后,氧化增量变化较小,且经250次循环氧化后,氧化产物中未发现Cr₂O₃的存在,其高温抗氧化性能均较基体明显提高,其中热浸镀90 s的涂层高温抗氧化性能更好。

关键词: K438高温合金, 热浸镀铝, 防护涂层, 循环氧化

Abstract: In view of the insufficient oxidation resistance of K438 nickel-based superalloy at high temperature, the aluminized coating was prepared on its surface by hot dip aluminizing technology. After vacuum diffusion annealing treatment at 1000 ℃ for 1 h, the high temperature cyclic oxidation tests at 1000 ℃ for 250 cycles were carried out on the superalloy with hot-dip aluminized coating. The cross-sectional microstructure of the coatings after high temperature oxidation was studied by means of scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). The results show that the oxidation mass gain curve of the substrate alloy begins to decline after oxidation at 1000 ℃ for 40 cycles, and the oxidation resistance at high temperature is poor, and the oxidation products such as Al₂O₃, TiO₂, Cr₂O₃, NiO and spinel NiCr₂O₄, NiAl₂O₄ are formed after oxidation at 1000 ℃ for 250 cycles. However, the oxidation mass gain changes a little after oxidation at 1000 ℃ for 40 cycles, the Cr₂O₃ is not found in the oxidation products of hot-dip aluminized coatings after oxidation at 1000 ℃ for 250 cycles, and its high temperature oxidation resistance is significantly higher than that of the substrate alloy, among which the coating hot-dip aluminized for 90 s has better oxidation resistance at high temperature.

Key words: K438 superalloy, hot-dip aluminizing, protective coating, cyclic oxidation

中图分类号:

邓鹏飞, 左林春, 陈星伟, 熊伟, 刘艳, 廖从来, 李智. K438铸造高温合金表面热浸镀铝涂层的抗氧化性能[J]. 金属热处理, 2021, 46(11): 207-212.

Deng Pengfei, Zuo Linchun, Chen Xingwei, Xiong Wei, Liu Yan, Liao Conglai, Li Zhi. Oxidation resistance of hot-dip aluminized coating on cast K438 superalloy[J]. Heat Treatment of Metals, 2021, 46(11): 207-212.

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K438铸造高温合金表面热浸镀铝涂层的抗氧化性能

Oxidation resistance of hot-dip aluminized coating on cast K438 superalloy

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