Title :
Study on high temperature oxidation behavior of Cr/Al alloying Fe3Si based ordered alloys
Author :
Zhou, Qi ; Wu, Haitao ; Jia, Jiangang ; Zhao, Hongshun
Author_Institution :
State Key Lab. of Gansu Adv. Nonferrous Metal Mater., Lanzhou Univ. of Technol., Lanzhou, China
Abstract :
The oxidation of Cr/Al alloying Fe3Si based ordered alloys was studied in air at 800°C. The oxidation behaviors of Cr/Al alloying Fe3Si based ordered alloys were characterized by X-ray diffraction, scanning electron microscope and electron probe micro analyzer. The results showed that the addition of Cr and Al element can increase the oxidation resistance of Fe3Si intermetallics.The Fe80Si10Cr5Al5 showed the highest Oxidation weight gain result of the spalling of oxide scale ,furthermore Fe80Si10Cr5Al5, Fe75Si15Cr5A5, Fe70Si20Cr5Al5 and Fe65Si20Cr5Al5 had the similar oxidation weight gain.The main oxidation product of Fe3Si based ordered alloys was metastable Al2O3 by the result of the Al diffusible oxydation.Cr promoted the stabilization phase transition of metastable Al2O3, there were the holes and grain boundary cracking, when the content of Si is greater than 10at% in the Fe3Si based ordered alloys.This is because oxidation film stresses increases and Cr2O3 diffusible generated vacancy collapse.
Keywords :
X-ray diffraction; aluminium alloys; chromium alloys; electron probe analysis; grain boundary diffusion; internal stresses; iron alloys; metallic thin films; oxidation; scanning electron microscopy; silicon alloys; solid-state phase transformations; vacancies (crystal); Fe65Si25Cr5Al5; Fe70Si20Cr5Al5; Fe75Si15Cr5Al5; Fe80Si10Cr5Al5; SEM; X-ray diffraction; XRD; based ordered alloys; diffusible generated vacancy; diffusible oxydation; electron probe micro analyzer; grain boundary cracking; high-temperature oxidation behavior; holes; intermetallics; metastable phase; oxidation film stresses; scanning electron microscope; spalling; stabilization phase transition; temperature 800 degC; Aluminum oxide; Coatings; Oxidation; Silicon; Surface treatment; Cr/Al alloying; Fe3Si; ordered alloys; oxidation; rate constants;
Conference_Titel :
Remote Sensing, Environment and Transportation Engineering (RSETE), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-9172-8
DOI :
10.1109/RSETE.2011.5965805
