Paper Information

Journal:   AMIRKABIR   FALL 2007- WINTER 2008 , Volume 18 , Number 67-C; Page(s) 89 To 95.
 
Paper: 

EFFECT OF ALUMINUM CONTENT ON THE MICROSTRUCTURE, HARDNESS AND MECHANICAL PROPERTIES OF AUSTEMPERED GREY CAST IRON

 
 
Author(s):  SHOJAEI E., DIVANDARI M., BOUTORABI S.M.A.
 
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Abstract: 
The effect of aluminum content, austenitizing temperature and austempering time and temperature on the microstructure and mechanical properties of Fe-C-Al grey cast iron are investigated. Three alloys containing 1, 2 and 4 weight percent of a1uminumare provided. The tensile samples are austenitized at 850°C and 900°C for 2h, followed by and austempering process at 275°C for 1-120min.
The results show that increase of austenitizing temperature from 850
°C to 900°C in the alloys with 1wt% and 2wt% aluminum decreases the elongation and ultimate tensile strength. In the samples without aluminum and containing 4wt% aluminum increase in the austenitizing, temperature leads to increasing of ultimate tensile strength and elongation. Experiments carried out on austenitized samples at 900°C shows that in alloys with 1wt% and 2wt% of aluminum maximum strength and elongation appear after 30 minutes of austempering but in samples without aluminum or those containing 4wt% aluminum the maximum strength and elongation appear after 60 minutes.
 
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