Record Details

Effect of Si on morphology of alumina scales

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Effect of Si on morphology of alumina scales
 
Creator JAMNAPARA, NI
AVTANI, DU
CHAUHAN, NL
RAOLE, PM
MUKHERJEE, S
KHANNA, AS
 
Subject Aluminising
9Cr-1Mo steels
Alumina
Oxidation
Blanket
F82H-MOD. STEEL
MILD-STEEL
OXIDATION
COATINGS
GROWTH
LAYER
IRON
EVOLUTION
BEHAVIOR
SILICON
 
Description Hot dip aluminised coatings with pure Al, Al-3Si and Al-7Si melts had been produced on 9Cr-1Mo steels and subsequently heat treated at 900 degrees C for 5 h under oxidising conditions to generate alumina films over Fe-Al diffused case. The characterisation of these samples by X-ray diffraction and SEM-EDX techniques indicated reduction in the post-heat treated aluminide case depth with increasing Si concentration. Further, it was observed that after oxidation heat treatment, pure Al coated samples indicated gamma-Al2O3 and theta-Al2O3, while Al-7Si coated samples revealed transformation of metastable theta-Al2O3 phase to stable alpha-Al2O3 phase. The present paper describes change in morphology of oxide after thermal oxidation from gamma to theta and theta to alpha as a function of the Si content of Al melt in hot dip aluminised 9Cr-1Mo steels. The effect of Si on the diffused aluminide case depth is also discussed.
 
Publisher MANEY PUBLISHING
 
Date 2014-10-16T12:40:37Z
2014-10-16T12:40:37Z
2012
 
Type Article
 
Identifier SURFACE ENGINEERING, 28(9)693-699
http://dx.doi.org/10.1179/1743294412Y.0000000046
http://dspace.library.iitb.ac.in/jspui/handle/100/15571
 
Language en