摘要
对有无La元素的Ni-20Cr-18W-1Mo基高温合金进行了1373 K/100 h的等温氧化试验,分别采用扫描电镜(SEM),X射线能谱(EDX)和X射线衍射(XRD)分析了氧化试样的氧化膜表面和截面形貌特征。结果表明,La元素的添加能够极大地提高基体和氧化膜之间的结合力,使得Ni-20Cr-18W-1Mo基高温合金在1373 K时的抗氧化性提高,相比于未添加La元素的Ni-20Cr-18W-1Mo基高温合金,添加La元素的高温合金具有更小的抛物线氧化速率常数κ'和较弱的氧化膜剥落,同时,形成的表面氧化膜更加致密纤细。
The isothermal oxidation experiments of Ni-20Cr-18W-1Mo superalloys with and without lanthanum element were con- ducted at 1373 K for 100 h in air. The oxide scales surface and the cross-section of isothermal oxidation samples were analyzed by scanning electron microscope, energy-dispersive X-ray spectroscopy and X-ray diffraction. Results show that the addition of La can significantly improve the binding ability between the matrix and the oxide scales, and consequently the oxidation resistance of Ni-20Cr-18W-1Mo alloy at 1373 K is improved. Comparing with that without La, the Ni-20Cr-18W-1Mo alloy with La has smaller parabolic rate constant κ＂ and weaker spalling oxidation, and the surface of oxide scales are much more compact. Key wards： Ni-20Cr-18W-1Mo superalloy; oxidation; lanthanum; oxide scale; parabolic rate constant
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第9期2060-2063,共4页
Rare Metal Materials and Engineering
基金
Fund of the State Key Laboratory of Solidification Processing,China(62-TP-2011)
