Paper Information

Journal:   AMIRKABIR   FALL 2007- WINTER 2008 , Volume 18 , Number 67-C; Page(s) 97 To 102.
 
Paper:  EFFECT OF SOLUTION HEAT TREATLNENTS ON MECHANICAL PROPETTIES OF COBALT-BASE SUPERALLOYS CO-CR-MO
 
Author(s):  AGHAZADEH J., HARATI FAR E.A.D., AVAZ POUR GH.
 
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Abstract: 
For the purpose of manufacturing of the Cobalt-base superalloy of Co-Cr-Mo (ASTM F75-87) an appropriate mold has been made from silicon:-rubber, and subsequently melting and alloying procedure was carried out. For alloying in this study a vacuum induction melting (VIM) was used. After conducting tensile test on produced specimen, it was observed that mechanical properties of superalloy except ductility are in the standard range; therefore, solution treatments were carried out on the specimens.
Specimens were preheated at 1130
°C and afterward those were subjected to solution. Heat treatments at 1230°C for several times. When heat treatments completed, specimens were discharged from furnace and were quenched in water. As a result of heat treatment, elongation was enhanced considerably. It seems that the main strengthening mechanism stems from the solid-solution and carbide precipitates. Heat treatments cause the dissolution of carbides specially grain boundary carbides, thus increasing ductility and reducing hardness.
 
Keyword(s): SUPERALLOY, COBALT, VITALLIUM, SOLUTION, HEAT TREATMENT
 
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