摘要
采用不连续增重法研究了ppm级S对第二代抗热腐蚀镍基单晶高温合金1 000℃恒温氧化行为的影响,测量了不同ppm级S含量合金的氧化动力学曲线,借助扫描电子显微镜(SEM)观察了合金氧化层截面的微观组织,利用X射线衍射分析仪(XRD)和能谱仪(EDS)确定了相结构,并分析了S含量变化对合金氧化机理的影响。结果表明:两种合金1 000℃的氧化动力学曲线均近似遵从抛物线规律, 2 ppm合金的氧化增重明显小于10 ppm合金;随着S含量ppm级的增加和氧化时间的延长,合金的抗氧化性能恶化。S含量的增加虽未改变氧化物的相组成,但明显改变了氧化物的形貌及不同氧化层的厚度、致密度及连续性,促进了合金内部TiN的形成。
Effect of sulfur(S) addition on isothermal oxidation behaviors of a nickel-base single crystal superalloy at1 000 ℃ was investigated using discontinuous weight gain method, the oxidation kinetics curves of the 2 ppm and 10 ppm alloys were measured, microstructure at the cross-section of the oxide scale was observed using scanning electron microscope(SEM), and the phase structure was determined using X-ray diffractometer(XRD) and energy dispersive spectroscopy(EDS). The results showed that the oxidation kinetics curves of the alloys at 1 000 ℃ almost followed the parabolic law, oxidation weight gain of the 2 ppm alloy was significantly smaller than that of 10 ppm alloy, and the oxidation resistance of the alloy deteriorated with the increase of ppm level sulfur content and the prolongation of oxidation time. Due to the increase of S content, the morphology of oxide, and the thickness, density and continuity of different oxide layers were changed.Furthermore, the addition of more S could accelerate the formation of the inner TiN even though the phase constitute of the oxide was not changed.
作者
张宗鹏
张思倩
王栋
王迪
陈立佳
楼琅洪
张健
ZHANG Zong-peng;ZHANG Si-qian;WANG Dong;WANG Di;CHEN Li-jia;LOU Lang-hong;ZHANG Jian(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China)
出处
《铸造》
CAS
北大核心
2019年第3期232-236,共5页
Foundry
基金
国家自然科学基金项目(51631008
51501117)
关键词
硫
高温合金
恒温氧化
抗氧化性
sulfur
superalloys
isothermal oxidation
oxidation resistance
作者简介
张宗鹏(1994-),男,硕士生,主要研究方向为镍基单晶高温合金的组织与性能。E-mail:zhangzp66@126.com;通讯作者:张思倩,女,副教授,博士,硕士生导师。电话:024-25496339,E-mail:sqzhang@alum.imr.ac.cn.
