Muflihah, Eha (2024) STUDI PENGARUH ISOTHERMAL AGING TERHADAP TRANSFORMASI FCC-HCP DAN SIFAT MEKANIK PADUAN Co-Cr-Mo ASTM F75. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.

	Text (Fulltext) Eha Muflihah_3334200051_Fulltext.pdf Restricted to Registered users only Download (4MB) | Request a copy
	Text (Bab 1) Eha Muflihah_3334200051_01.pdf Restricted to Registered users only Download (1MB) | Request a copy
	Text (Bab 2) Eha Muflihah_3334200051_02.pdf Restricted to Registered users only Download (870kB) | Request a copy
	Text (Bab 3) Eha Muflihah_3334200051_03.pdf Restricted to Registered users only Download (244kB) | Request a copy
	Text (Bab 4) Eha Muflihah_3334200051_04.pdf Restricted to Registered users only Download (1MB) | Request a copy
	Text (Bab 5) Eha Muflihah_3334200051_05.pdf Restricted to Registered users only Download (29kB) | Request a copy
	Text (Referensi) Eha Muflihah_3334200051_Ref.pdf Restricted to Registered users only Download (114kB) | Request a copy
	Text (Lamp) Eha Muflihah_3334200051_Lamp.pdf Restricted to Registered users only Download (682kB) | Request a copy

Abstract

Co-Cr-Mo ASTM F75 alloy is widely used as an implant material due to its good mechanical properties, biocompatibility, and high corrosion and wear resistance. However, the as-cast CCM has uneven precipitates and large grain size. Microstructure affects mechanical and tribological properties, so better microstructure can reduce wear on hip and knee prostheses. The isothermal aging process is carried out to even out the size and distribution of precipitates so that the mechanical properties meet the standards, while the matrix phase, consisting of metastable γ (FCC) matrix and ε (HCP) martensite, also affects these properties. Therefore, this research will study the effect of isothermal aging on the FCC-HCP transformation and mechanical properties of Co-Cr-Mo ASTM F75 alloy. In this research process, solution treatment was carried out at 1050 oC for 3 hours with water cooling on 15 samples, followed by aging at 800oC water cooling, 800oC air cooling, 900oC water cooling with variations in holding time of 1, 3, 6, 9 and 12 hours. Furthermore, microstructure observation, XRD testing, and hardness testing. In this study, the increase in holding time in the isothermal aging process increases the FCC-HCP transformation. The hardness value is directly proportional to the %HCP obtained and the time used in the ishotermal aging process, the highest hardness value of 444 HV is obtained at a temperature of 800oC at a holding time of 12 hours with air cooling. Cooling affects the transformation process because when using water cooling media will result in thermal activation which causes the FCC-HCP transformation process to slow down.

Actions (login required)

View Item