Effect of Mold Preheating on the Microstructure of the Investment Cast Astm F-۷۵ Implant Alloy
Publish Year: 1390
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJE-24-6_005
تاریخ نمایه سازی: 17 بهمن 1400
Abstract:
The ASTM F-۷۵ (Co-۲۸%Cr-۶%Mo) is widely used as a biocompatible alloy in medicinefor manufacturing implants. In this study, effect of mold preheating on the as-cast microstructure of thealloy was investigated using the solid investment casting process. Several mold preheating temperaturesof ۵۵۰, ۷۰۰, ۸۵۰ and ۱۰۰۰ °C were selected at the same melt superheat. The samples were characterizedby optical microscopy, electron microscopy and macro-hardness test. The results showed that the size ofgrains and secondary carbides of the matrix was increased by increasing the mold preheatingtemperature. In addition, morphology of the M۲۳C۶ carbides was changed from the eutectic carbidesprecipitated in grain boundaries to the blocky shape precipitated in both carbide interface and dendriticmatrix. The appropriate microstructure with nearly fine grains with homogeneous distribution ofsecondary phases was obtained at mold preheating temperature of about ۸۵۰ °C.
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Authors
Mohsen Fatahi
Faculty of Engineering, Islamic Azad University Ahvaz Branch
Ahmad Kermanpur
Materials Science and Engineering, Isfahan University of Technology
Mahmood Meratian
Materials Science and Engineering, Isfahan University of Technology
Hossein Ghazvinizadeh
Materials Engineering, Isfahan University of Technology
Hossein Minouei
Materials Science and Engineering, Isfahan University of Technology