Author/Authors :
Mohammadnezhad، .M نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran , , Javaheri، .V نويسنده Department of Material Engineering, Iran University of Industries and Mines, Tehran 1439-5518, Iran , , Shamanian، .M نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran , , Naseri، .M نويسنده Unit Research and Development of Isfahan Casting Industrial (ICI) ,
Abstract :
In the present study, the austenitic heat resistant cast steel was investigated in as-cast conditions and after being
used in copper converter parts. Specimens were cut from an ex-service failed converter part which has been aged
for 1900 h. The openings of copper converter in Sarchashmeh Copper Complex in Iran are made of a heat resisting
austenitic steel Fe-25Cr-15Ni. Microstructural changes after working period were studied via optical microscopy
and scanning electron microscopy equipped with energy dispersive spectrum. The effect of temperature and carbon
diffusion on the microstructure, chromium-rich carbides, the chromium carbides transformation to sigma phase
and other precipitates during service condition were discussed. The diffusion of SO2 and copper and formation of
sub layer decrease the mechanical properties. The formation of sigma phase can be lead to degrade the ductility
and toughness.
