铜含量对改良型T91钢高温氧化行为的影响

doi:10.13228/j.boyuan.issn0449-749x.20210020

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摘要为了研究铜元素对改良型T91钢抗高温氧化性能的影响,在650 ℃空气环境下,采用了高温氧化试验法和不连续称重法,获得了3种不同铜含量的高温氧化动力学曲线,并利用XRD、SEM、EDS对其高温氧化膜的物相、表面及截面形貌结构和特征进行了分析。结果表明,随着铜含量的增加,改良型T91耐热钢的抗高温氧化性能得到提高,表面氧化膜的晶粒增大,且更为均匀、致密;氧化膜为双层结构,外层为疏松多孔的Fe₂O₃“非保护性”氧化膜,内层则拥有连续致密的“保护性”氧化膜;铜元素在高温氧化过程中对铝、硅元素的扩散有一定的促进作用,可生成Al₂O₃和SiO₂保护性氧化膜,在与Cr₂O₃保护性氧化膜的共同作用下提高了试验钢的抗高温氧化性能。

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	李洪
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	张必良
	喻翔
	赵成志

关键词 ：耐热钢, 铜含量, 高温氧化, 氧化膜, 形貌

Abstract：In order to study the influence of Cu on the high temperature oxidation resistance of modified T91 steel,the high temperature oxidation experiment and discontinuous weighing method were carried out at 650 ℃ in air. According to the experiments,3 kinds of high temperature oxidation kinetic curves with different Cu content were obtained. In addition,phase,morphology and layered structure and characteristics of high temperature oxide film were analyzed by XRD,SEM,and EDS. It turns out that,the high temperature oxidation resistant of T91 steel was improved with the increase of Cu content. The grain of the surface oxide film was enlarged,and became more uniform and dense. The oxide scale has a double-layered structure,in which the outer layer was loose and porous and the main phase was Fe₂O₃,while the inner layer was a continuous dense "protective" oxide film. Cu has a certain promotion effect on the diffusion of Al and Si during the high temperature oxidation process,which could generate Al₂O₃ and SiO₂ oxide film,and improved the high temperature oxidation performance of the test steel under the combined action of the Cr₂O₃ protective oxide film.

Key words： heat-resistant steel Cu content high temperature oxidation oxide film morphology

收稿日期: 2021-01-12

引用本文:

李洪, 雷敬, 陈胜, 张必良, 喻翔, 赵成志. 铜含量对改良型T91钢高温氧化行为的影响[J]. 钢铁, 2021, 56(7): 123-128. LI Hong, LEI Jing, CHEN Sheng, ZHANG Bi-liang, YU Xiang, ZHAO Cheng-zhi. Effect of Cu content on high temperature oxidation behavior of modified T91 steel[J]. Iron and Steel, 2021, 56(7): 123-128.

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