Abstract
The influence of surface roughness on its high temperature oxidation for an Ni-base superalloy was studied using laser profilometry, atomic force microscopy, mass change measurements, glow-discharge optical emission spectrometry, scanning electron microscopy, X-ray diffraction, and positron annihilation methods. The isothermal and cyclic air oxidation tests were performed at 1000 °C and showed dependence of oxidation behavior on surface roughness. Smoother surfaces oxidation resulted in the formation of a multilayered oxide scale consisting of NiO, Cr2O3, and internally oxidized Al2O3 while a rougher surface formed protective Al2O3 scale. The factors responsible for different oxidation behaviors were determined as higher concentration of vacancies and increased residual stresses in the near-surface region of studied alloys.
Subject
General Materials Science
Reference45 articles.
1. High Temperature Oxidation and Corrosion of Metals;Young,2008
2. Oxidation of Ni-Cr-Al alloys between 1100 °C and 1200 °C;Giggins;Solid. State Sci.,1971
3. High-Temperature Oxidation of Metals;Birks,2006
4. ASM Specialty Handbook, Heat Resistant Materials;Davis,1997
5. Effect of substrate alloy composition on the oxidation behaviour and degradation of aluminide coatings on two Ni base superalloys
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献