Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第3期    总第252期    2020年3月

[PDF全文下载]        

    

文章编号:1004-0609(2020)-03-0580-07
高铬含量Fe-Cr合金800 ℃的循环和恒温高温氧化行为
徐勋虎1,张 涛2,王 玲1,张洪华1,门丹丹1,向军淮1,安江山1

(1. 江西科技师范大学 江西省材料表面工程重点实验室,南昌 330013;
2. 中国科学院固体物理研究所,合肥 230031
)

摘 要: 研究了高铬含量的Fe-20Cr、Fe-30Cr和Fe-40Cr三种合金在800 ℃,空气中的循环氧化行为和0.1?MPa纯氧气中的恒温氧化行为。三种合金在循环氧化条件下的氧化动力学均不规则,随着Cr含量的增加,其抗氧化性能逐渐增强。24 h氧化后,Fe-20Cr单位面积增质最大,其值为2. 21×10-2 mg/(cm2·h),Fe-40Cr单位面积增质最小,其值为1. 45×10-2? mg/(cm2·h)。结果表明:三种合金的恒温氧化动力学曲线均可分为暂态氧化和稳态氧化两个阶段,每个阶段都能较好地符合抛物线规律。总体上来说,恒温条件下三种合金都具有优异的抗高温氧化性能,其24 h单位面积氧化增质比循环氧化下降了将近一个数量级。但随着Cr含量的增加,三种合金抗氧化性能逐渐下降,Fe-20Cr反而具有最佳的抗氧化性能。在循环和恒温氧化条件下,三种Fe-Cr合金均生成了单一的保护性Cr2O3外氧化膜。

 

关键字: Fe-Cr;高温氧化;高铬含量

Oxidation behavior of Fe-Cr alloys with high Cr content at 800 ℃
XU Xun-hu1, ZHANG Tao2, WANG Ling1, ZHANG Hong-hua1, MEN Dan-dan1, XIANG Jun-huai1, AN Jiang-shan1

1. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China;
2. Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

Abstract:The cyclic oxidation in air and isothermal oxidation in 0.1?MPa pure oxygen at 800 ℃ for Fe-20Cr, Fe-30Cr and Fe-40Cr alloys with a high Cr content were investigated. The results show that the three alloys exhibit irregular oxidation kinetics under the cyclic oxidation condition. With the increase of Cr content, the oxidation resistance of the alloy is improved. After 24 h oxidation, Fe-20Cr obtains the highest mass gain per unit area with the value of 2.21×10-2 mg/(cm2·h), while Fe-40Cr obtains the lowest value of 1.45×10-2 mg/(cm2·h). The isothermal oxidation kinetics of the three alloys can be divided into two stages as transient and steady oxidation. At each stage the kinetics obeys the parabolic law quite well. On the whole, the three alloys show excellent oxidation resistance. Compared with the case of cyclic oxidation, the mass gain per unit area after 24 h oxidation of the three alloys decreases by almost an order of magnitude. On the contrary, with the increase of Cr content, the oxidation resistance of the three alloys decreases gradually and Fe-20Cr presents the best performance. Under all conditions, an exclusive and protective Cr2O3 layer forms on the surfaces of the three Fe-Cr alloys.

 

Key words: Fe-Cr; high temperature oxidation; high Cr content

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com