Oxidation of AISI 304 and AISI 439 stainless steels
Oxidation of AISI 304 and AISI 439 stainless steels
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DOI：
10.1016/j.msea.2006.10.022
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发表时间：
2007-02-25
期刊：
影响因子：
6.4
通讯作者：
Sabioni, A. C. S.
中科院分区：
文献类型：
--
作者：
Huntz, A. M.;Reckmann, A.;Sabioni, A. C. S.
研究了AISI 304和AISI 439不锈钢在高温、不同氧分压和有无水蒸气条件下的氧化行为。在850 ~ 950 ℃恒温50 h的条件下进行了热重分析，并通过SEM和EDX对氧化生长的氧化膜进行了显微结构和化学分析。还通过掠射X射线衍射和X光电子能谱（XPS）对氧化膜进行了分析。在850摄氏度以上、高氧压下，AISI 439钢比AISI 304具有更高的抗氧化性。另一方面，AISI 304钢在整个温度范围内的低氧压下具有较高的抗氧化性，为了确认不锈钢氧化形成的Cr2 O3的生长动力学是否由氧或/和铬通过氧化膜的扩散控制，根据扩散数据，使用瓦格纳理论从理论上计算了氧化常数。氧化常数的计算值与实验值相当吻合，因此证实了扩散过程对不锈钢上氧化铬生长的作用。(c)2006 Elsevier B. V.保留所有权利。
The oxidation behaviour of AISI 304 and AISI 439 stainless steels was studied at high temperatures, under various oxygen pressures and in the presence or not of water vapour. Thermogravimetric analyses were conducted in isothermal conditions from 850 to 950 degrees C for 50h and microstructural and chemical analyses of the oxide films grown by oxidation were performed by SEM and EDX. The oxide films were also analysed by grazing X-ray diffraction and by X photoelectron spectroscopy (XPS).The AISI 439 steel has higher oxidation resistance than AISI 304, above 850 degrees C, under high oxygen pressures. On the other hand, the AISI 304 steel has higher oxidation resistance under low oxygen pressures in the whole temperature range.In order to check whether the growth kinetics of Cr2O3 formed by the oxidation of stainless steels was controlled by oxygen or/and chromium diffusion through the oxide film, the oxidation constants were theoretically calculated on the basis of diffusion data using Wagner's Theory. The calculated values of the oxidation constants agree reasonably well with experimental values, therefore confirming the role of diffusion processes on the growth of chromia on stainless steels. (c) 2006 Elsevier B.V. All rights reserved.