钨对314奥氏体耐热钢抗高温氧化行为的影响
Effect of tungsten on high-temperature oxidation resistance of 314 austenitic heat-resistant steel
金涛 1徐涛 2王冰杰 1赵磊 1常立忠 1施晓芳1
作者信息
- 1. 安徽工业大学冶金工程学院,安徽马鞍山 243032
- 2. 安徽工业大学冶金工程学院,安徽马鞍山 243032;安徽富凯特材有限公司,安徽绩溪 245300
- 折叠
摘要
采用不连续称重法研究了不同钨质量分数(0、1.5％、2.0％和2.5％)的314奥氏体耐热不锈钢在1000和1100 ℃空气中的抗高温氧化性能,并采用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)对氧化膜表面形貌、截面形貌以及物相进行分析.结果表明:4种不同钨含量实验钢在1 000和1 100 ℃空气中的氧化动力学曲线均遵循抛物线规律.钨元素没有参与氧化膜的构成,实验钢的氧化膜主要由尖晶石氧化物(MnCr2O4、FeCr2O4、Mn3O4以及Fe3O4)外层、Cr2O3中间层以及半连续状分布的SiO2内层组成;在同一温度下,随着实验钢中钨含量的增加,其表面氧化膜剥落程度逐渐加重,因而导致抗高温氧化性能也随之变差,这种效果在1100 ℃下更明显;尽管如此,经测定,4种钢在实验温度下均属于抗氧化性级别.
Abstract
The high-temperature oxidation resistance properties of 314 austenitic heat-resistant stainless steels with different tungsten contents(0,1.5,2.0 and 2.5 wt.％)in atmospheric environment of 1 000 and 1 100 ℃ were investigated by means of discontinuous weighing method.The surface morphology,cross-sectional morphology and phase composition of the oxide scales were analyzed by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).The results show the oxidation kinetics curves of four different experimental steels at 1000 and 1 100 ℃ all follow the parabolic law.No tungsten element is found in the oxide scale.The oxide scale is mainly composed of the outer layer of spinel oxides(MnCr2O4,FeCr2O4,Mn3O4 and Fe3O4),the middle layer of Cr2O3 and the semicontinuous internal layer of SiO2.At the same temperature,as the tungsten content in the experimental steel increases,the degree of surface oxide film peeling gradually intensifies,resulting in a decrease in high-temperature oxidation resistance.This effect is more pronounced at 1 100 ℃;nevertheless,it has been determined that all four types of steel belong to the oxidation resistance level at the experimental temperature.
关键词
钨元素/314奥氏体耐热钢/高温氧化/氧化动力学/氧化膜Key words
tungsten element/314 austenitic heat-resistant steel/high temperature oxidation/oxidation kinetics/oxide scale引用本文复制引用
基金项目
国家自然科学基金资助项目(52074002)
安徽省自然科学基金资助项目(2208085J37)
出版年
2024
NETL
NSTL
万方数据